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(12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) 



(19) World IntcUcctual Properly 
Organization 

International Bureau 



I lllllllllllllllllllllllllllllllllllllllllllli 



(43) International Publication Date (10) International Publication Number 

15 July 2004 (15.07.2004) PCT WO 2004/059648 A2 



(51) International Patent Classiflcation': GllB 20/18, 

20/12 

(21) International Application Number: 

PCT/JP2003/016057 

(22) International FUlng Date: 

15 December 2003 (15.12.2003) 

(25) Filing Language: English 

(26) Publication Language: English 

(30) Priority Data: 

2002- 373532 25 December 2002 (25. 1 2.2002) JP 

2003- 276843 18 July 2003 (18.07.2003) JP 

(71) Applicant (for all designated States except US): MAT- 
SUSHITA ELECTRIC INDUSTRIAL CO., LTD. 

[IP/JP]; 1006, Oaza Kadoma, Kadoma-shi, Osalca 
571-8501 (JP). 



(72) Inventors; and 

(75) Inventors/Applicants (for US only): TAKAHASHI, 
Yoshihisa [JP/JP]; 1-4-40-747, Nonakaminami, Yo- 
dogawa-ku, Osaka-shi, Osaka 532-0022 (JP). ITO, 
Motoshi [JP/JP]; 3-17-25-302 Furuichi, Joto-ku, Os- 
aka-shi, Osaka 536-0001 (JP), 

(74) Agents: YAMAMOTO, Shusaku et al.; Fifteenth Floor, 
Crystal Tower, 2-27, Shiromi 1-chome, Chuo-ku, Osaka- 
shi, Osaka 540-6015 (JP). 

(81) Designated States (national): AE, AG, AL, AM, AT, AU, 
AZ, BA, BB, BG, BR, BW, BY BZ, CA, CH, CN, CO, CR, 
CU, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, FI, GB, GD, 
GE, GH, GM, HR, HU, ID, IL, IN, IS, KE, KG, KP, KR, 
KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, 
MW, MX, MZ, NI, NO, NZ, OM, PG, PR, PL, PT, RO, RU, 
SC, SD, SE, SG, SK, SL, SY, TJ, TM, TN, TR, IT, TZ, UA, 
UG, US, UZ, VC, VN, YU, ZA, ZM, ZW. 

[ Continued on next page] 



i (54) Title: WRTTR-ONCE READ-MANY INFORMATION RECORDING MEDIUM, INFORMATION RFCORDING METHOD, 
I INFORMATION REPRODUCTION METHOD, INFORMATION RECORDING APPARATUS, AND INFORMATION REPRO- 
I DUCTION APPARATUS 



Second defect management ar 



-f 

Temporary 
management 



Defecl management working area 01 



Defect management working area 9.\ 



Third defect management area 



■ourth defect manageroent ar' 



y12 
;y13 



(57) Abstract: A writc-oncc read-many 
information recording medium is provided, 
which is capable of easily searching for a 
latest DDS and a latest defect list. At least one 
disc management working area is sequentially 
allocated in a predetermined direction on the 
write-once read-many information recording 
medium of the present invention. The latest 
defect list and the latest DDS are provided 
in a recorded disc management working area 
neighboring a border between the recorded disc 
management working area and an unrecorded 
disc management working area, where the 
latest defect list precedes the latest DDS in the 
predetermined direction. 



O 



1 



wo 2004/059648 A2 lllllllllllllllllllllllllllllllllllllllllllll 



(84) Designated States (regional): ARIPO patent (BW, GH, 
GM, KE, LS, MW, MZ, SD, SL, SZ, TZ, UG, ZM, ZW), 
Eurasian patent (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM), 
European patent (AT, BR, BG, CH, CY, CZ, DE, DK, EE, 
ES, FI, FR, GB, GR, HU, IE, IT, LU, MC, NL, FT, RO, SE, 
SI, SK, TR), OAPI patent (BE, BJ, CF, CG, CI, CM, GA, 
GN, GQ, GW, MI., MR, NE, SN, TD, TG). 



Published: 

— without international search report and to be republished 
upon receipt of that report 

For two-letter codes and other abbreviations, refer to the "Guid- 
ance Notes on Codes and Abbreviations " appearing at the begin- 
ning of each regular issue of the PCT Gazette. 



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- 1 - 
DESCRIPTION 

WRITE-ONCE READ-MANY INFORMATION RECORDING MEDIUM, 
INFORMATION RECORDING METHOD, INFORMATION REPRODUCTION 
5 METHOD, INFORMATION RECORDING APPARATUS, AND 

INFORMATION REPRODUCTION APPARATUS 

TECHNICAL FIELD 

0 The present invention relates to a write-once 

read-many information recording medium, an information 
recording method for recording information onto the 
write- once read-many information recording medium, an 
information reproduction method for reproducing information 

5 from the write-once read-many information recording medium, 
an information recording apparatus for recording information 
onto the write-once read-many information recording medium, 
and an information reproduction apparatus for reproducing 
information from the write-once read-many information 
20 recording medium. 

BACKGROUND ART 

Recently, large-capacity exchangeable information 
recording media, and disc drive apparatuses which handle 
large -capacity exchangeable information recording media, 
are widely used. As large -capacity exchangeable 
information recording media, optical discs (e.g. , DVDs, etc. ) 
are well known. 

In optical disc drive apparatuses, information is 
recorded onto an optical disc by forming small pits thereon 
using laser light. Therefore, optical disc drive 



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apparatuses are capable of recording large -capacity 
exchangeable information. Optical discs have a 
disadvantage of exchangeable information recording media 
that the recording surface is likely to suffer from defects , 
5 such as dust, scratches, or the like. 

To cope with this problem, optical disc drive 
apparatuses have to perform defect management in order to 
secure the reliability of recorded or reproduced data. 

0 

In a conventional defect management technique, two 
defect management areas (DMA) are allocated at predetermined 
positions in each of the inner and outer peripheries of a 
rewritable optical disc (i.e., a total of four DMAs are 
provided) . If defect management information is updated, new 
defect management information is rewritten into these defect 
management areas (e.g., Japanese Laid-Open Publication 
No. 5-006626). 

Figure 23 shows the data structure of a conventional 
rewritable optical disc 400. 

A data area 5 contains a user data area 16 for 
recording/reproducing user data, and a spare area 17 for 
providing a block (hereinafter also referred to as 
"replacement block") which replaces a defect block present 
in the user data area 16. The spare area 17 is provided in 
advance . 

A lead-in area 4 and a lead-out area 6 each contain 
defect management areas for recording information about a 
defect block present in the data area 5. The lead-in area 4 
contains a first defect management area 10 (hereinafter also 



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referred to as "DMAl") and a second defect management area 
11 (hereinafter also referred to as "DMA2"). The lead-out 
area 6 contains a third defect management area 12 
(hereinafter also referred to as "DMA3" ) and a fourth defect 
5 management area 13 (hereinafter also referred to as ''DMA4" ) . 

Each of the DMAl to the DMA4 has a predetermined 
position and a fixed length. Management information 
provided in each of the DMAl to the DMA4 has a length which 

10 varies depending on the number of defect blocks, i.e., a 
variable length. Note that all of the DMAl to the DMA4 have 
the same information, i.e. , a multiple of pieces of the same 
information are stored on a disc. This is because defects 
may occur in the DMAl to the DMA4 themselves. For example, 

15 if information cannot be reproduced from a DMA but Information 
can be reproduced from any one of the DMAl to the DMA4, the 
defect management information can be obtained. 

The DMAl to the DMA4 each contain a disc definition 
20 structure (hereinafter also referred to as "DDS") 14 and 
a defect list (hereinafter also referred to as "DFL") 15, 
where the DDS 14 precedes the DFL 15. 

The DFL 15 contains a defect list header 32 and M 
25 defect entries 33 (M: an integer of 0 or more). 

The defect list header 32 contains the number of the 
defect entries 33 contained in a DFL 15 and the like. The 
defect list header 32 is located at a predetermined position 
30 in the DFL 15 (e.g., the beginning of the DFL 15). 

The defect entry 33 contains positional information 
about a defect block detected in the data area 5 ; replacement 



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block positional information about a spare area which 
replaces the defect block; and the like. 

The DDS 14 contains defect list beginning positional 
5 information indicating the position of the DFL 15, and the 
like. 

The DMAl to the DMA4 contained in the rewritable 
optical disc 400 are rewritable. Therefore, every time 
defect management information is updated, latest defect 
management information can be written over the DMAl to the 
DMA4, i.e., updates can be performed. Thus, latest defect 
management information can be consistently recorded in the 
DMAl to the DMA4 at the fixed positions. 

Figure 24 shows the structure of a conventional 
rewritable optical disc recording/ reproduction 
apparatus 200. 

The optical disc recording/ reproduction 
apparatus 200 is connected via an I/O bus 170 to a higher 
level control apparatus (not shown). The higher level 
control apparatus is typically a host computer. 

The optical disc recording/reproduction 
apparatus 200 comprises: a command processing section 110 
for processing a command from the higher level control 
apparatus; a recording control section 120 for controlling 
recording of an optical disc; a reproduction control 
section 130 for controlling reproduction of an optical disc ; 
a defect management information storage buffer 140 for 
storing contents reproduced from any one of the DMAl to the 
DMA4; a data buffer 150 for temporarily storing recorded 



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data and reproduced data; and a defect management information 
processing section 180 for performing processing relating 
to defect management information. 

5 The defect management information processing 

section 180 comprises: a defect management information 
reading section 161 for detecting a normal defect management 
area from the DMAl to the DMA4 and reading and transferring 
contents from the normal defect management area to the defect 
management information storage buffer 140; a defect 
management information updating section 164 for, when defect 
block information has been changed, updating the contents 
of the defect management infoinnation storage buffer 140 to 
create new defect information; a defect management 
information writing section 162 for writing the contents 
updated by the defect management information updating 
section 164 to the DMAl to the DMA4; and a defect management 
information control memory 163 for storing an operational 
control state of the defect management information processing 
section 180. 

However, information can be recorded into the DMAl 
to the DMA4 of a write-once read-many information recording 
medium (write-once read-many optical disc) only once. 
Therefore, in the case of write- once read-many information 

recording media, it is not possible that latest defect 
management information is consistently recorded at a 
predetermined position in the DMAl to the DMA4 as in rewritable 
information recording media (rewritable optical discs). 
Therefore, recording/reproduction apparatuses for 
rewritable information recording media cannot perform 
recording/reproduction on write-once read-many information 
recording media capable of defect management. 



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The present invention is provided to solve the 
above -described problems. An object of the present 
invention is to provide a write-once read-many information 
5 recording medium on which recording/reproduction can be 
performed by a recording/reproduction apparatus for 
rewritable information recording media; an information 
recording method for recording information onto the 
write -once read-many information recording medium; an 
0 information reproduction method for reproducing information 
from the write-once read-many information recording medium; 
an information recording apparatus for recording information 
onto the write-once read-many information recording medium; 
and an information reproduction apparatus for reproducing 
information from the write-once read-many information 
recording medium. 

DISCLOSURE OF THE INVENTION 

According to an aspect of the present invention, a 
write-once read-many information recording medium is 
provided, wherein: at least one disc management working area 
is sequentially allocated in a predetennined direction; in 
the at least one disc management working area , disc management 
information, which is management information about the 
write-once read-many inf ozmation recording medium, and disc 
definition structure containing positional information 
about the disc management information, are provided; latest 
disc management information and latest disc definition 
structure are provided, wherein the latest disc management 
information precedes the latest disc definition structure 
in the predetermined direction; the latest disc management 
information is disc management information provided in a 



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recorded disc management working area neighboring a border 
between the recorded disc management working area and an 
unrecorded disc management working area; the latest disc 
definition structure is a disc definition structure 
5 containing positional information about the latest disc 
management information; and the latest disc definition 
structure is provided at a predetermined position in the 
recorded disc management working area neighboring the border , 
the predetermined position being capable of being calculated 
10 based on the border as a reference. 

In one embodiment of this Invention, the disc 
management information has a variable size; and the disc 
definition structure has a fixed size. 

In one embodiment of this invention, the write-once 
read-many information recording medium contains a data area 
for recording data and a spare area, the spare area being 
a replacement area for the data area; the disc management 
information contains a replacement list containing 
correspondence relationship information indicating a 
correspondence relationship between a replacement source 
area contained in the data area and a replacement destination 
area contained in the spare area; and the disc definition 
structure contains replacement list positional information 
which is positional information about the replacement list . 

In one embodiment of this invention, the 
predetermined direction is a direction from an inner 
30 periphery to an outer periphery of the write-once read-many 
information recording medium; and the latest disc definition 
structure is provided at a predetermined position which is 
capable of being calculated based on an end of the recorded 



20 



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disc management working area neighboring the border as a 
reference . 

In one embodiment of this invention, the 
5 predetermined direction is a direction from an outer 
■periphery to an Inner periphery of the write-once read-many 
information recording medium; and the latest disc definition 
structure is provided at a predetermined position which is 
capable of being calculated based on a beginning of the 
recorded disc management working area neighboring the border 
as a reference. 

In one embodiment of this invention, the disc 
management working area contains a plurality of blocks ; each 
of theplurality of blocks is a unit for recording/reproducing 
data; and the disc management information and the disc 
definition structure are provided in different blocks in 
the plurality of blocks. 

In one embodiment of this invention, the disc 
management working area contains one or more blocks; each 
of the one or more blocks is a unit for recording/reproducing 
data; the disc management Information and the disc definition 
structure shares at least one of the one or more blocks; 
and the disc definition structure is provided at a 
predetermined position in a predetermined block among blocks 
contained in the recorded disc management working area 
neighboring the border , the predet eimined block being capable 
of being calculated based on the border as a reference. 

In one embodiment of this invention, a f Inallzatlon 
Identifying flag is recorded in the write-once read-many 
information recording medium; and the f Inallzatlon 



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identifying flag indicates prohibition of additionally 
recording data into the at least one disc management working 
area. 

5 In one embodiment of this invention, at least one 

of the disc definition structure and the disc management 
information contains the finalization identifying flag. 

In one embodiment of this invention, the write-once 
10 read-many information recording medium contains at least 
one disc management area; in the at least one disc management 
area, the last disc management information and the last disc 
definition structure are provided; the last disc management 
information is the latest disc management information 
15 provided in the at least one disc management area; the last 
disc definition structure is a disc definition structure 
containing positional information about the last disc 
management information; and the last disc management 
information and the last disc definition structure are 
20 provided from a beginning of the at least one disc management 
area, wherein the last disc definition structture precedes 
the last disc management information in the direction from 
the inner periphery to the outer periphery of the write-once 
read-many information recording medium. 

25 

In one embodiment of this invention, the disc 
management working area contains a plurality of blocks ; each 
of the plurality of blocks is a unit for recording/ reproducing 
data; and the disc management information and the disc 
definition structure are provided in different blocks in 
the plurality of blocks. 



In one embodiment of this invention, the disc 



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management working area contains one or more blocks; each 
of the one or more blocks Is a unit for recording/ reproducing 
data; the disc management information and the disc definition 
structure shares at least one of the one or more blocks; 
5 and the disc definition structure is provided at a 
predetermined position in a predetermined block among blocks 
contained in the recorded disc management working area 
neighboring the border , the predetermined block being capable 
of being calculated based on the border as a reference. 

In one embodiment of this invention, a finalization 
identifying flag is recorded in the write-once read-many 
information recording medium; and the finalization 
identifying flag indicates prohibition of additionally 
recording data into the at least one disc management working 
area. 

In one embodiment of this invention, at least one 
of the disc definition structure and the disc management 
information contains the finalization identifying flag. 

In one embodiment of this invention, the write- once 
read-many information recording medium contains at least 
one disc management area; in the at least one disc management 
area, the last disc management information and the last disc 
definition structure are provided; the last disc management 
Information is the latest disc management Information 
provided in the at least one disc management area; the last 
disc definition structure is a disc definition structure 
containing positional infoannation about the last disc 
management information; and the last disc management 
infoirmation and the last disc definition structure are 
provided from a beginning of the at least one disc management 



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area, wherein the last disc definition structure precedes 
the last disc management information in the direction from 
the inner periphery to the outer periphery of the write-once 
read-many information recording medium. 

5 

According to another aspect of the present invention , 
an information recording method for recording information 
onto a write-once read-many information recording medium, 
is provided, wherein at least one disc management working 
10 area Is sequentially provided in a predetermined direction 
on the write- once read-many information recording medium, 
the information recording method comprising the steps of: 

(a) selecting an unrecorded disc management working area 
neighboring a border between a recorded disc managenient 

1 5 working area and the unrecorded dls c management working area ; 

(b) recording disc management Information, which Is 
management information about the write- once read-many 
information recording medium, into the unrecorded disc 
management working area neighboring the border; and 

20 (c) recording a disc definition structure containing 
positional information about the disc management information 
recorded in the step (b) into the unrecorded disc management 
working area neighboring the border, wherein the disc 
management information and the disc definition structure 

25 are provided in the predetermined direction, the disc 
management information preceding the disc definition 
structure in the predetermined direction, and the disc 
definition structure is provided at a predetermined position 
in the unrecorded disc management working area neighboring 

30 the border, the predetermined position being capable of being 
calculated based on the border as a reference. 



In one embodiment of this invention, the disc 



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management information has a variable size and the disc 
definition structure has a fixed size. 

In one embodiment of this invention, the write-once 
5 read-many information recording medium contains a data area 
for recording data and a spare area, the spare area being 
a replacement area for the data area; the disc management 
information contains a replacement list containing 
correspondence relationship information indicating a 
correspondence relationship between a replacement source 
area contained in the data area and a replacement destination 
area contained in the spare area; and the disc definition 
structure contains replacement list positional information 
which is positional information about the replacement list . 

In one embodiment of this invention, the 
predetermined direction is a direction from an inner 
periphery to an outer periphery of the write-once read-many 
information recording medium; and the disc definition 
structure containing the positional information about the 
disc management information recorded in the step (b) is 
provided at a predetermined position which is capable of 
being calculated based on an end of the unrecorded disc 
management working area neighboring the border as a 
reference . 

In one embodiment of this invention, the 
predetermined direction is a direction from an outer 
periphery to an inner periphery of the write-once read-many 

Information recording medium; and the disc definition 
structure containing the positional information about the 
disc management information recorded in the step (b) is 
provided at a predetermined position which is capable of 



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being calculated based on a beginning of the unrecorded disc 
management working area neighboring the border as a 
reference . 

5 In one embodiment of this invention, the step (b) 

further comprises determining whether or not the recording 
of the disc management information has been normally 
performed; the step (c) further comprise determining whether 
or not the recording of the disc definition structure has 

10 been normally performed; and the information recording method 
further comprises the step of: (d) repeatedly performing 
the step (b) until the recording of the disc management 
information is normally performed, and repeatedly performing 
the step (c) until the recording of the disc definition 

15 structure is normally performed. 

In one embodiment of this invention, the step (b) 
further comprises determining whether or not the recording 
of the disc management information has been normally 

20 performed; the step (c) further comprises determining 
whether or not the recording of the disc definition structure 
has been normally performed; and the information recording 
method further comprises the step of: (d) repeatedly 
performing the step (b) until the recording of the disc 

25 management information is normally performed , and repeatedly 
performing the step (c) until the recording of the disc 
definition structure is normally performed. 

According to another aspect of the present invention , 
30 an information reproduction method for reproducing 
information from a write-once read-many information 
recording medium, is provided, wherein: at least one disc 
management working area is sequentially allocated in a 



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predetermined direction on the write-once read-many 
information recording medium; in the at least one disc 
management working area, disc management information, which 
is management information about the write- once read-many 
5 information recording medium, and disc definition structure 
containing positional information about the disc management 
information, are provided; latest disc management 
information and latest disc definition structure are provided 
in the predetermined direction, the latest disc management 

10 information preceding the latest disc definition structure 
in the predetermined direction; the latest disc management 
information is disc management information provided in a 
recorded disc management working area neighboring a border 
between the recorded disc management working area and an 

15 unrecorded disc management working area; the latest disc 
definition structure is a disc definition structure 
containing positional information about the latest disc 
management information; the latest disc definition structure 
is provided at a predetermined position in the recorded disc 

20 management working area neighboring the border, the 
predetermined position being capable of being calculated 
based on the border as a reference, the information 
reproduction method comprising the steps of: (a) searching 
for a position of the border to obtain border positional 

25 information indicating the position of the border; 
(b) reproducing the latest disc definition structure based 
on the border positional information; (c) obtaining 
positional information about the latest disc management 
information based on the latest disc definition structure; 

30 and (d) reproducing the disc management information based 
on the positional information about the latest disc 
management information. 



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In one embodiment of this invention, the disc 
management information has a variable size and the diso 
definition structure has a fixed size. 

5 In one embodiment of this invention, the write-once 

read-many information recording medium contains a data area 
for recording data and a spare area, the spare area being 
a replacement area for the data area; the disc management 
information contains a replacement list containing 

10 correspondence relationship information indicating a 
correspondence relationship between a replacement source 
area contained in the data area and a replacement destination 
area contained in the spare area; and the disc definition 
structure contains replacement list positional information 

15 which is positional information about the replacement list . 

In one embodiment of this invention, the 
predetermined direction is a direction from an inner 
periphery to an outer periphery of the write- once read-many 
20 information recording medium; and the latest disc definition 
structure is provided at a predetermined position which is 
capable of being calculated based on an end of the recorded 
disc management working area neighboring the border as a 
reference. 

25 

In one embodiment of this invention, the 
predetermined direction is a direction from an outer 
periphery to an inner periphery of the write-once read-many 
information recording medium; and the latest disc definition 
30 structure is provided at a predetermined position which is 
capable of being calculated based on a beginning of the 
recorded disc management working area neighboring the border 
as a reference. 



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According to another aspect of the present Invention , 
an Information recording apparatus for recording Information 
onto a write-once read-many Information recording medium, 
5 is provided, wherein at least one disc management working 
area is sequentially provided in a predetermined direction 
on the write -once read-many infomnation recording medium, 
the information recording apparatus comprising: (a) a 
section for selecting an unrecorded disc management working 

10 area neighboring a border between a recorded disc management 
working area and the unrecorded disc management working area ; 
(b) a section for recording disc management information, 
which is management information about the write -once 
read-many information recording medium, into the unrecorded 

15 disc management working area neighboring the border; (c) a 
section for recording a disc definition structure containing 
positional information about the disc management information 
recorded in the step (b) into the unrecorded disc management 
working area neighboring the border, wherein the disc 

20 management Information and the disc definition structure 
are provided in the predetermined direction, the disc 
management Information preceding the disc definition 
structure In the predetezmlned direction, and the disc 
definition structure Is provided at a predetermined position 

25 in the unrecorded disc manageihent working area neighboring 
the border, the predetermined position being capable of being 
calculated based on the border as a reference. 

In one embodiment of this invention, the disc 
30 management information has a variable size and the disc 
definition structure has a fixed size. 

In one embodiment of this invention, the write-once 



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read-many information recording mediiim contains a data area 
for recording data and a spare area, the spare area being 
a replacement area for the data area; the disc management 
information contains a replacement list containing 
5 correspondence relationship information indicating a 
correspondence relationship between a replacement source 
area contained in the data area and a replacement destination 
area contained in the spare area; and the disc definition 
structure contains replacement list positional information 
10 which is positional information about the replacement list. 



In one embodiment of this invention, the 
predetermined direction is a direction from an inner 
periphery to an outer periphery of the write -once read-many 
15 information recording medium; and the disc definition 
structure containing the positional information about the 
disc management information recorded by the section (b) is 
provided at a predetermined position which is capable of 
being calculated based on an end of the unrecorded disc 
20 management working area neighboring the border as a 
reference - 

In one embodiment of this invention, the 
predetermined direction is a direction from an outer 
periphery to an inner periphery of the write-once read-many 
information recording medium; and the disc definition 
structure containing the positional information about the 
disc management information recorded by the section (b) is 
provided at a predetermined position which is capable of 
being calculated based on a beginning of the unrecorded disc 
management working area neighboring the border as a 
reference . 



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In one embodiment of this invention, the section (b) 
further comprises a section for determining whether or not 
the recording of the disc management information has been 
normally performed; the section (c) further comprise a 
5 section for determining whether or not the recording of the 
disc definition structure has been normally performed; and 
the information recording apparatus further comprises: (d) a 
section for repeatedly performing recording of the disc 
management information until the recording of the disc 
10 management information is normally performed, andrepeatedly 
performing recording of the disc definition structure until 
the recording of the disc definition structure is normally 
performed. 

In one embodiment of this invention, the section (b) 
further comprises a section for determining whether or not 
the recording of the disc management information has been 
normally performed; the section (c) further comprises a 
section for determining whether or not the recording of the 
disc definition structure has been normally performed; and 
the information recording apparatus further comprises : ( d ) a 
section for repeatedly performing recording of the disc 
management information until the recording of the disc 
management information is normally performed, andrepeatedly 
performing recording of the disc definition structure until 
the recording of the disc definition structure is normally 
performed. 

According to another aspect of the present Invention, 
30 an information reproduction apparatus for reproducing 
information from a write-once read-many Information 
recording medium, is provide, wherein: at least one disc 
management working area is sequentially allocated in a 



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predetermined direction on the write-once read-many 
information recording medium; in the at least one disc 
management working area, disc managemient information, which 
is management information about the write-once read-many 
5 information recording medium, and disc definition structure 
containing positional information about the disc management 
information, are provided; latest disc management 
information and latest disc definition structure are provided 
in the predetermined direction, the latest disc management 
information preceding the latest disc definition structure 
in the predetermined direction; the latest disc management 
information is disc management information provided in a 
recorded disc management working area neighboring a border 
between the recorded disc management working area and an 
unrecorded disc management working area; the latest disc 
definition structure is a disc definition structure 
containing positional information about the latest disc 
management information; the latest disc definition structure 
is provided at a predetermined position in the recorded disc 
management working area neighboring the border, the 
predetermined position being capable of being calculated 
based on the border as a reference, the information 
reproduction apparatus comprising: (a) a section for 
searching for a position of the border to obtain border 
positional information Indicating the position of the border ; 
(b) a section for reproducing the latest disc definition 
structure based on the border positional information; (c) a 
section for obtaining positional information about the latest 
disc management information based on the latest disc 
definition structure; and (d) a section for reproducing the 
disc management information based on the positional 
information about the latest disc management information. 



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In one embodiment of this invention, the disc 
management information has a variable size and the disc 
definition structure has a fixed size. 

5 In one embodiment of this invention, the write-once 

read-many information recording medium contains a data eirea 
for recording data and a spare area, the spare area being 
a replacement area for the data area; the disc management 
information contains a replacement list containing 

10 correspondence relationship information indicating a 
correspondence relationship between a replacement source 
area contained in the data area and a replacement destination 
area contained in the spare area; and the disc definition 
structure contains replacement list positional Information 

15 which is positional information about the replacement list. 

In one embodiment of this invention, the 
predetermined direction is a direction from an inner 
periphery to an outer periphery of the write-once read-many 
20 Information recording medium; and the latest disc definition 
structure is provided at a predetermined position which is 
capable of being calculated based on an end of the recorded 
disc management working area neighboring the border as a 
reference . 

25 

In one embodiment of this invention, the 
predetermined direction is a direction from an outer 
periphery to an inner periphery of the write- once read-many 
information recording medium; and the latest disc definition 
30 structure is provided at a predetermined position which is 
capable of being calculated based on a beginning of the 
recorded disc management working area neighboring the border 
as a reference. 



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- 21 - 



BRIEF DESCRIPTION OF THE DRAWINGS 

Figure 1 Is a diagram showing an arrangement of areas 
5 in a write-once read-many optical disc according to 
Embodiment 1 of the present Invention. 

Figure 2 Is a diagram showing a data structure of 
awrlte-once read-many optical disc according to Embodiment 1 
10 of the present Invention. 

Figure 3 is a diagram showing data structures of a 

DOS and a defect list. 

Figure 4 is a diagram showing a configuration of an 
optical disc recording/reproduction apparatus according to 
Embodiment 1 of the present Invention. 

Figure 5 is a flowchart of a procedure for obtaining 
the latest defect list and the latest DOS from a recorded 
defect management working area neighboring a border between 
the recorded defect management working area and an unrecorded 
defect management working area in a write-once read-many 
optical disc according to Embodiment 1 of the present 
invention . 

Figure 6 is a diagram showing a process for searching 
for a recording end position. 

Figure 7 Is a flowchart showing a procedure for 
searching for a recording end position. 

Figure 8 is a diagram showing a state In which a defect 



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list and a DDS are additionally recorded into a DMWA contained 
in a temporary defect management area. 

Figure 9 is a flowchart of a procedure for 
5 additionally recording a defect list and a DDS into a defect 
management working area of a write-once read-many optical 
disc according to Embodiment 1 of the present invention. 

Figure 10 is a flowchart of a procedure for 
10 additionally recording a new defect list and DDS into a defect 
management working area while determining whether or not 
the defect list and the DDS have been normally recorded. 

Figure 11 is a diagram showing a state in which a 
15 defect list and a DDS are additionally recorded into a defect 
management working area in accordance with the procedure 
described with reference to Figure 10. 

Figure 12 is a diagram showing a data structure of 
20 another write-once read-many optical disc according to 
Embodiment 1 of the present invention. 

Figure 13 is a flowchart of a procedure for 
finalization according to Embodiment 1 of the present 
25 invention. 

Figure 14 is a diagram showing data structures of 
a rewritable optical disc and a write-once read-many optical 
disc after finalization for comparison. 

30 

Figure 15 is a flowchart of another finalization 
procedure according to Embodiment 1 of the present invention . 



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- 23 - 

Figure 16 is a flowchart of a f inalization 
determination procedure for determining whether or not a 
write-once read-many optical disc is already finalized. 

5 Figure 17 is a flowchart of another finalization 

determination procedure for determining whether or not a 
write-once read-many optical disc is already finalized. 

Figure 18 is a diagram showing a data structure of 
10 a DMWA according to Embodiment 2 of the present invention. 

Figure 19 is a diagram showing a structure of a SDDS . 

Figure 20 is a flowchart of a procedure for obtaining 
15 a SDDS and a SDFL from the latest recorded defect management 
working area among defect management working areas contained 
in a temporary defect management area. 

Figure 21 is a flowchart showing a procedure for 
20 additionally recording a SDFL and a SDDS into a defect 
management working area in a write-once read-many optical 
disc according to Embodiment 2 of the present invention. 

Figure 22 is a diagram showing an exemplary defect 
management working area in which a space bit map information 
and a defect list are provided as child information. 

Figure 23 is a diagram showing the data structure 
of a conventional rewritable optical disc. 

Figure 24 is a diagram showing the structure of an 
optical disc recording/reproduction apparatus which can 
handle the conventional rewritable optical disc of Figure 23 . 



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BEST MODE FOR CARRYING OUT THE INVENTION 

Hereinafter, the present invention will be described 
5 by way of illustrative embodiments with reference to the 
accompanying drawings. 

In the embodiments below, a write-once read-many 
information recording medium (hereinafter also referred to 
as "write-once read-many optical disc") is employed. 

(Embodiment 1) 

1.1. Data structure of write-once read-many optical 

disc 

Figure 1 shows an arrangement of areas in awrite-once 
read-many optical disc 1 according to Embodiment 1 of the 
present invention. A number of tracks 2 are spirally formed 
on the disc -like write- once read-many optical disc 1. Each 
track 2 is subdivided into a number of blocks 3 . A block 3 
is a unit for error correction, which is a minimum unit for 
recording or reproduction operations. For example, in the 
case of DVD-RAM using red laser the size of a block 3 is 
1 ECC (32 KBytes) while in the case of large -capacity BD-RE 
using blue laser the size of a block 3 is 1 cluster (64 KBytes). 

A lead-in area 4, a data area 5, and a lead- out area 6 
are allocated on the write-once read-many optical disc 1. 
User data is recorded into or reproduced from the data area 5 . 
The lead-in area 4 and the lead-out area 6 function as a 
margin with which even if an optical head (not shown) accesses 
but overruns an end of the data area 5, the optical head 
can follow a designated track. 



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Figure 2 shows a data structure of the write-once 
read-many optical disc 1 according to Embodiment 1 of the 
present invention. 

5 Areas on the write-once read-many optical disc 1 are 

roughly divided into the lead-in area 4, the data area 5 
and the lead -out area 6. 

The lead- in area 4 contains a first defect management 
10 area 10 (hereinafter also referred to as "DMAl" ) and a second 
defect management area 11 (hereinafter also referred to as 
"DMA2"), and a temporary defect management area 20. 

The DMAl and the DMA2 are used for management of 
15 information or the like in defect blocks of the data area 5. 

The data area 5 is used for recording of data, 
containing a user data area 16 and a spare area 17. 

The user data area 16 is a write-once read-many area 
into which any information, such as real time data (e.g., 
music, video, etc.), computer data (e.g., documents, 
databases , etc . ) , or the like , can be recorded by the user . 

The spare area 17 is a replacement area for the data 
area 5. For example, when a defect block is detected in the 
user data area 16, data is recorded into a replacement area 
instead of the defect block. In the data structure of the 
write-once read-many optical disc 1 of Figure 2, a spare 
area 17 is provided in each of the inner (i.e., closer to 
the lead-in area 4) and outer (i.e., closer to the lead-out 
area 6 ) peripheries of the data area 5. However, the number 
of spare areas 17 or the positions of spare areas 17 may 



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be arbitrarily determined but not limited to the number of 
spare areas or the positions of spare areas shown in Figure 2 . 

' The lead- out area 6 contains a third defect 
5 management area 12 (hereinafter also referred to as "DMAS" ) 
and a fourth defect management area 13 (hereinafter also 
referred to as "DMA4"). 

The DMA3 and the DMA4 are areas for managing 
10 information about a defect block in the data area 5 or the 
like. 

Each of the DMAl to the DMA4 has a predetermined 
position and a fixed length. Management information 
15 provided in each of the DMAl to the DMA4 has a variable length 
which varies depending on the number of defect blocks. 

Each of the DMAl to the DMA4 contains a disc definition 
structure (hereinafter also referred to as "DDS") 14 and 
20 a defect list (hereinafter also referred to as "DFL") 15, 
where the DDS 14 precedes the DFL 15. 

The temporary defect management area 20 contains N 
defect management working areas (hereinafter also referred 
25 to as "DMHA") 21, where N is an Integer of 1 or more. 

The defect management working area 21 is used for 
temporarily recording defect management information which 
has been updated before the write-once read-many optical 
30 disc 1 is finalized. The defect management working area 21 
contains a DDS 14 and a defect list 15, where the defect 
list 15 precedes the DDS 14 . The defect management working 
area 21 contains at least one block. A block is a unit for 



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- 27 - 

recording/reproducing data. 

As used herein, the term "finalize a write-once 
read-many optical disc" means that the state of a write-once 
5 read-many optical disc is changed from a write-once read-many 
state to a non-write-once read-many state. For example, by 
recording the contents of the latest defect management 
working area 21 to the DMAl to the DMA4, a data structure 
of the write-once read-many optical disc 1 can be changed 
10 to a data structure which is compatible with a data structure 
of a rewritable optical disc, i.e. , the write-once read-many 
optical disc 1 is changed from a write -once read-many state 
to a non-write-once read-many state. Flnalization will be 
described in detail below. 

15 

At least one defect management working area 21 
(DMWA#1 to DMWA#N (N: an integer of 1 or more) ) is sequentially 
allocated from the beginning toward the end of the temporary 
defect management area 20 (i.e., in the direction of from 

20 the inner periphery to the outer periphery of the write-once 
read-many optical disc 1 ) . Defect information is recorded 
sequentially from a defect management working area 21 at 
the beginning of the temporary defect management area 20 
(closer to the inner periphery of the write-once read-many 

25 optical disc 1 ) . In each defect management working area 21 , 
a defect list 15 and a DDS 14 are provided in the direction 
from the beginning to the end of the temporary defect 
management area 20 (the direction from the inner periphery 
to the outer periphery of the write-once read-many optical 

30 disc 1), where the defect list 15 precedes the DDS 14. In 
other words, a DDS 14 and a defect list 15 are provided in 
each defect management working area 21 in reverse order with 
respect to each of the DMAl to the DMA4. 



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Note that the temporazy defect management area 20 
containing defect management working areas 21 may not be 
necessarily contained in the lead-in area 4 . The temporary 
defect management area 20 may be contained in, for example, 
the lead- out area 6 or the spare area 17 excluding the user 
data area 16. 

For example, a DDS 14 is located in a recorded defect 
management working area neighboring a border between the 
recorded defect management working area and an unrecorded 
defect management working area. The DDS 14 is located at 
a predetermined position in a recorded defect management 
working area neighboring the border, and the predetermined 
position can be calculated based on the border. In 
Embodiment 1 of the present invention. It is assumed that 
a DDS 14 is located at the end of a recorded defect management 
working area neighboring a border between the recorded defect 
management working area and an unrecorded defect management 
working area. 

Note that the position of a DDS 14 is not limited 
to the end of a defect management working area. A DDS 14 

may be located at a predetermined position which can be 
calculated from a reference, i.e., the end (border) of a 
recorded defect management working area neighboring a border 
between the recorded defect management working area and an 
unrecorded defect management working area. 

Figure 3 shows data structures of a DDS 14 and a 
defect list 15. 

A DDS 14 contains positional Information about a 



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defect list 15. For example, the DDS 14 contains a defect 
list beginning positional information 30 indicating a 
beginning position at which the defect list 15 is located 
and other information 31. For example, the defect list 
5 beginning positional information 30 is herein a sector 
address which is positional information about a sector (1 
sector has a size of 2 KBytes) which is the smallest 
addressable unit. 

10 A DDS 14 has a fixed length which is, for example, 

the size of 1 block . In Embodiment 1 of the present invention , 
it is assumed that a DDS 14 has a size of 1 block. Note that 
aDDS 14maynot necessarilyhaveaf ixedlengthif the position 
of information indicating the position of a defect list 15 

15 (i.e. , the defect list beginning positional information 30) 
can be calculated based on a reference , i.e., a border between 
a recorded defect management working area and an unrecorded 
defect management working area. This is because the 
positions of defect lists can be calculated from the border 

20 as a reference. 

A defect list 15 contains a defect list header 32 
and M defect entries 33 (M: an integer of 0 or more) . 

25 The defect list 15 may further contain information 

indicating an anchor indicating the end of defect management 
information in addition to the defect list header 32 and 
the defect entry 33. 

30 The defect list header 32 contains the number of 

defect entries 33 contained in a defect list, or the like. 



The defect entry 33 contains correspondence 



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relationship information indicating a correspondence 
relationship between an area in a data area (replacement 
source ) and an area in a spare area ( replacement destination ) . 
The defect entry 33 contains, for example, positional 
5 information about a defect block detected in the user data 
area 16 and replacement block positional information about 
the spare area 17 which contains a replacement destination 
of the defect block. 

A defect list 15 has a variable length which depends 
on the number of defect entries 33 registered in the defect 
list 15. Specifically, the sizes of the defect management 
working area #1 to the defect management working area #N 
are not necessarily the same (see Figure 2). 

1.2. Configuration of an optical disc 
recording/reproduction apparatus 100 

Figure 4 shows a configuration of an optical disc 
recording/reproduction apparatus 100 according to 
Embodiment 1 of the present invention. 

The optical disc recording/reproduction 
apparatus 100 is connected via an I/O bus 170 to a higher 
level control apparatus (not shown). The higher level 
control apparatus is, for example, a host computer. 

The optical disc recording/reproduction 
apparatus 100 comprises: a command processing section 110 
for processing a command from the higher level control 
apparatus; a recording control section 120 for controlling 
recording of a write-once read-many optical disc 1; a 
reproduction control section 130 for controlling 
reproduction of an optical disc; a defect management 



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information storage buffer 140 for storing contents 
reproduced from any one of the DMAl to the DMA4 or contents 
reproduced from a defect management working area 21; a data 
buffer 150 for temporarily storing recorded data and 
5 reproduced data; and a defect management information 
processing section 160 for performing processing relating 
to defect management information. 

The defect management information processing 
section 160 comprises a defect management information 
reading section 161 , a defect management information writing 
section 162, a defect management information control 
memory 163, a defect management information updating 
section 164, a defect management working information reading 
section 165, and a defect management working information 
writing section 166. 

The defect management information reading 
section 161 detects a normal defect management area from 
20 the DMAl to the DMA4 and reads and transfers contents from 
the defect management area to the defect management 
information storage buffer 140. 

The defect management information reading 
25 section 161 further reads out data from one of a plurality 
of defect management areas allocated on the write-once 
read-many optical disc 1, determines whether or not the 
defect management area has been recorded, and based on the 
result of determination, determines whether or not the 
30 write -once read-many optical disc 1 has been changed from 
a write-once read-many state to a non-write-once read-many 
state. 



10 



15 



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- 32 - 

For example, the defect management Information 
reading section 161 reads out data from at least one of the 
DM&l to the DMA.4 . If the write-once read-many optical disc 1 
can be normally reproduced, it is determined that the 
5 write-once read-many optical disc 1 has been finalized. If 
all of the DMAl to the DMA4 are unrecorded and data cannot 
be normally reproduced from these defect management areas, 
it is determined that the write-once read-many optical disc 1 
has not been finalized. 

10 

If defect block information is changed or the like, 
the defect management information updating section 164 
updates the contents of the defect management information 
storage buffer 140 to create new defect management 
5 information. 

7he defect management information writing 
section 162 writes the contents updated by the defect 
management information updating section 164 to the DMAl to 
the DMA4 . In other words , the defect management information 
writing section 162 records defect management information 
to the DMAl to the DMA4 for f inalization. 

The defect management information control 
memory 163 stores an operational control state of the defect 
management information processing section 160. 

The defect management working information reading 
section 165 searches the defect management working areas 21 
contained in the temporary defect management area 20 for 
the latest recorded defect management working area 21. 
Contents recorded in the latest defect management working 
area 21 are read out to the defect management information 



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Storage buffer 140. 

Note that the defect management Information reading 
section 161 reads out data from each of the DMAl to the DMA4 
5 and determines whether or not the write- once read-many 
optical disc 1 has been finalized. Alternatively, the 
defect management working information reading section 165 
can determine whether or not the write -once read-many optical 
disc 1 has been finalized. For example, the defect 
management working information reading section 165 
determines whether or not the write -once read-many optical 
disc 1 has been finalized, based on whether or not a 
f inalization identifying flag is recorded at a predetermined 
position in a defect management working area 21. The 
finallzation Identifying flag indicates that additional 
recording of data to at least one defect management working 
area 21 Is prohibited. 

Note that the recording position of the finallzation 
Identifying flag Is not limited to a predetermined position 
in a defect management working area 21. The finallzation 
identifying flag may be recorded at a predetermined position 
in the write-once read-many optical disc 1. 

For example, the finallzation Identifying flag may 
be recorded In at least one of the disc definition structure 14 
and the defect list 15. If the defect management working 
information reading section 165 reads out the finallzation 
identifying flag recorded in at least one of the disc 
definition structure 14 and the defect list 15, it is 
determined that the write-once read-many optical disc 1 has 
been finalized. 



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The defect management working inf oarraation writing 
section 166 writes contents updated by the defect management 
information updating section 164 to an available defect 
management working area 21. In addition, the finalization 
5 identifying flag can be written to the defect management 
working area 21. For example, the defect management working 
information writing section 166 records the finalization 
identifying flag to at least one of the disc definition 
structure 14 and a defect list 15. 

.0 

1.3. Obtaining the latest defect management 
information 

Hereinafter, a method for obtaining (reproducing) 
information recorded on the write-once read-many optical 
5 disc 1 according to Embodiment 1 of the present invention 
(the latest defect list and the latest DDS recorded in a 
defect management working area neighboring a border between 
the recorded defect management working area and an unrecorded 
defect management working area) will be described. 

Figure 5 shows a procedure for obtaining the latest 
defect list 15 and the latest DDS 14 from a recorded defect 
management working area neighboring a border between the 
recorded defect management working area and an unrecorded 
defect management working area in the write-once read-many 
optical disc 1 according to Embodiment 1 of the present 
invention . Hereinafter, such a procedure will be described 
step by step with reference to Figure 5. 

Step 601: the defect management working inf ormation 
reading section 165 searches for the position of a border 
between a recorded defect management working area and an 
unrecorded defect management working area and obtains border 



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positional information indicating the position of the border . 

For example, the defect management working 
information reading section 165 searches for the end posit ion 
5 of recorded areas ( hereinafter also referred to as "recording 
end position") in the temporary defect management area 20 
and stores the position of a defect management working area 
21 at the end position in a recording end position 40 of 
the defect management information control memory 163 . For, 

10 example, the position of a defect management working area 
21 is herein a sector address which is positional information 
about a sector located at a recording end position. After 
the position of the defect management working area 21 at 
the detected recording end is stored, the process goes to 

15 step 602. Note that the search for the recording end position 
will be described in detail below. 

Step 602 : the defect management working information 
reading section 165 reproduces the latest DDS 14 based on 
20 the border positional information, and based on the latest 
DDS 14, obtains positional information about the latest 
defect list 15. 

For example, the defect management working 
25 infoannation reading section 165 reads out the latest DDS 14 

having a size of 1 block which ends at a recording end 
position 40 to the defect management information storage 
buffer 140 and stores the defect list beginning positional 
information 30 contained in the latest DDS 14 at a defect 
30 list beginning position 41 in the defect management 
information control memory 163. After the latest DDS 14 is 
read out and the defect list beginning positional information 
30 is stored, the process goes to step 603. 



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Step 603: the latest defect list 15 is reproduced 
based on positional information about the latest defect list 
15. 

5 

For example, the defect management working 
information reading section 165 reads the latest defect list 
15 located whose beginning is the defect list beginning 
position 41 to the defect management information storage 
10 buffer 140. After the latest defect list 15 is read out, 
the process is ended. 

In this case, if the recording end position 40 
Indicates that no temporary defect management area 20 is 

15 recorded, reading in steps 602 and 603 is not required. 
Instead of reading, a DDS 14 and a defect list 15 may be 
previously stored in the defect management information 
storage buffer 140. Note that the stored DDS 14 contains 
the defect list beginning positional Information 30 which 

20 has been initialized to a predetermined value, and in the 
stored defect list 15, the number of defect entries in the 
defect list header 32 has been Initialized (the niunber of 
defect entries = 0), i.e., the stored defect list 15 has 
no defect entry 33. 

25 

Note that the size of a defect list 15 to be read 
out may be calculated based on the number of defect entries 
contained in the defect list header located at the beginning 
of the defect list 15, or may be calculated by subtracting 
30 the beginning position of a DDS 14 from the defect list 
beginning position. 

Figure 6 shows a proces s for s earching for a recording 



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end position. Figure 7 shows a procedure for searching for 
a recording end position. Searching for a recording end 
position means searching for the latest recorded defect 
management working area 21. 

5 

Hereinafter, a procedure for searching for a 
recording end position will he described step by step with 
reference to Figures 6 and 7. 

10 Step 801 : the defect management working information 

reading section 165 performs first amplitude examination. 
The first amplitude examination is performed at regular 
predetermined intervals of blocks from the beginning of the 
temporary defect management area 20 until no amplitude is 

15 found. After no amplitude is found, the process goes to 
step 802. 

Step 802: the defect management working information 
reading section 165 performs second amplitude examination. 
20 In the second amplitude examination, a position at which 
the presence of amplitude ends is searched for between the 
position at which amplitude was found and the position at 
which no amplitude was found. After a position at which no 
amplitude is found, the process goes to step 803. 

25 

Step 803: the defect management working information 
reading section 165 obtains a recording endposition obtained 
by the examination (the position of a border between the 
latest recorded defect management working area and an 
30 unrecorded defect management working area) . After the 
recording end position is obtained, the process is ended. 



With the above- described procedure, the defect 



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management working information reading section 165 can read 
out the contents of the latest recorded defect management 
working area 21. 

5 Note that a procedure for searching for a recording 

end position is not limited to the recording end position 
searching procedure described with reference to Figure 7. 
For example , a recording end position can be found by searching 
a beginning position having amplitude from the end to the 
10 beginning of the temporary defect management area 20. 

In the embodiment of Figure 5, step 601 corresponds 
to "searching for the position of a border and obtaining 
border positional information indicating the position of 

15 the border" . Step 602 corresponds to "reproducing latest 
disc definition structure based on the border positional 
information" and "obtaining positional information about 
latest disc management information based on the latest disc 
definition structure". Step 603 corresponds to 

20 "reproducing disc management information based on positional 
information about the latest disc management information" . 

However, a procedure for obtaining the latest defect 
list 15 and the latest DDS 14 from a recorded defect management 

2 5 working area neighboring a border between the recorded defect 
management working area and an unrecorded defect management 
working area in the write -once read-many optical disc 1 is 
not limited to the procedure of Figure 5. Any procedure for 
obtaining the latest defect list 15 and the latest DDS 14 

30 from a recorded defect management working area neighboring 
a border between the recorded defect management working area 
and an unrecorded defect management working area in the 
write- once read-many optical disc 1 can be employed as long 



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as the procedure comprises the above -described "searching 
for the position of a border and obtaining border'positional 
information indicating the position of the border", 
"reproducing latest disc definition structure based on the 
5 border positional information" and "obtaining positional 
information about latest disc management Information based 
on the latest disc definition structure", and "reproducing 
disc management Information based on positional information 
about the latest disc management information" . 

1.4. Update of defect management information 
Hereinafter, a method for recording Information (a 
defect list 15 and a DDS 14) onto the write-once read-many 
optical disc 1 according to Embodiment 1 of the present 
invention will be described. 

Figure 8 shows a state in which a defect list 15 and 
a DDS 14 are additionally recorded into the DMWA 21 contained 
in the temporary defect management area 20. 

A portion (a) of Figure 8 shows a state in which a 
defect list 15 and a DDS 14 are recorded into a DMWA#1 contained 
in the temporary defect management area 20 at a first time 
point. A portion (b) of Figure 8 shows a state in which a 
defect list 15 and a DDS 14 are recorded into a DMWA#2 
contained in the temporary defect management area 20 at a 
second time point. A portion (a) of Figure 8 shows a state 
in which a defect list 15 and a DDS 14 are recorded into 
a DMWA#3 contained in the temporary defect management area 20 
at a third time. 

In Figure 8, filled DMWAs indicate recorded DMWAs 
in which a defect list 15 and a DDS 14 have been recorded. 



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- 40 - 

while open DMWAs Indicate unrecorded DMWAs in which the defect 
list 15 and the DDS 14 have not been recorded. 

A new defect list 15 and DDS 14 are additionally 
5 recorded into an unrecorded DMWA which is located at the 
beginning of a plurality of unrecorded DMWAs . In other words , 
a new defect list 15 and DDS 14 are additionally recorded 
to an unrecorded DMWA neighboring a border between the 
unrecorded DMWA and a recorded DMWA. 

10 

Therefore, the latest defect list 15 and DDS 14 are 
located in a recorded DMWA neighboring the end of a plurality 
of recorded DMWAs . In other words , the latest defect list 15 
and DDS 14 are located in a recorded DMWA neighboring a border 
15 between an unrecorded DMWA and the recorded DMWA. 

Figure 9 shows a procedure for additionally 
recording a defect list 15 and a DDS 14 into a defect management 
working area 21 of the write-once read-many optical disc 1 
20 according to Embodiment 1 of the present invention. 

The defect management Working information writing 
section 166 additionally records a new defect list 15 and 
DDS 14 into a defect management working area 21. 

25 

In this case, the defect list 15 stored in the defect 
management information storage buffer 140 is permitted by 
the defect management information updating section 164 to 
retain the latest contents. 

30 

Specifically, for example, when a new defect block 
Is detected, the defect management information updating 
section 164 adds a defect entry corresponding to a new 



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replacement block (i.e., a new defect block) to a defect 
list 15 stored in the defect management information storage 
buffer 140, and sorts defect entries based on positional 
information about defect blocks , which are contained in the 
5 defect entries. Further, the defect management information 
updating section 164 adds one to the number of defect entries 
in the defect list header. 

Hereinafter, a procedure for additionally recording 
10 a defect list 15 and a DDS 14 to a defect management working 
area 21 in the write -once read-many optical disc 1 according 
to Embodiment 1 of the present invention will be described 
step by step with reference to Figure 9. 

15 Step 901: the defect management information 

updating section 164 selects an unrecorded defect management 
working area neighboring a border between a recorded defect 
management working area and the unrecorded defect management 
working area. 

20 

For example, the defect management information 
updating section 164 adds to one a recording end position 40 
in the defect management information control memory 163 and 
updates a DDS 14 contained in the defect management 

25 information storage buffer 140 at the resultant recording 
end position 40, so that an unrecorded defect management 
working area is selected which is located at the beginning 
of a plurality of unrecorded defect management working areas . 
In other words, by updating a DDS 14 so that defect list 

30 beginning positional information 30 indicates the beginning 
position of an unrecorded defect management working area, 
an unrecorded defect management working area located at the 
beginning of a plurality of unrecorded defect management 



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working areas is selected. After the DDS 14 is updated, the 
process goes to step 902. 

Step 902: the defect management working information 
5 writing section 166 records a defect list 15, which is 
management information about the write-once read-many 
optical disc 1 , into an unrecorded defect management working 
area neighboring a border and records a DDS 14 containing 
positional information about the recorded defect list 15 
10 into the unrecorded defect management working area 
neighboring the border. 

For example, the defect management working 
information writing section 166 records ah updated defect 
15 list 15 contained in the defect management information 
storage buffer 140 to the beginning position of an unrecorded 
area and records an updated DDS 14 in such a manner as to 
follow the defect list 15. After the defect list 15 and the 
DDS 14 are recorded, the process is ended. 

20 

With the above -de scribed procedure, the defect 
management working information writing section 166 records 
the latest defect list 15 and DDS 14 to a defect management 
working area 21 contained in the temporary defect management 
25 area 20. 

Note that updating a defect list 15 using the defect 
management information updating section 164 is only 
illustrative. It may be only required that a defect list 15 
3 0 contains information about defect ( s ) . For example , sorting 
defect entries may not be required. 



Note that a defect list 15 and a DDS 14 may be recorded 



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- 43 - 

into a defect management working area 21 of the temporary 
defect management area 20 at any timing as long as the defect 
list 15 and the DDS 14 are recorded In such a manner that 
allows the DDS 14 to be necessarily located at the end of 
5 a recorded defect management working area when the state 
of an apparatus and the state of a medium are changed. The 
state of an apparatus and the state of a medium are changed, 
means, for example, that a write-once read-many optical disc 
is ejected from the optical disc recording/reproduction 
10 apparatus 100 or that the optical disc 
recording /reproduction apparatus 100 is switched off. 

Note that when a defect list 15 and a DDS 14 are 
recorded Into a defect management working area, it may be 
15 determined whether or not the defect list 15 and the DDS 14 
have been normally recorded. 

Figure 10 shows a procedure for additionally 
recording a new defect list 15 and DDS 14 into a defect 
20 management working area 21 while determining whether or not 
the defect list 15 and the DDS 14 have been normally recorded. 

It is now assumed that the contents of a defect list 
15 stored in the defect management information storage 
25 buffer 140 is permitted by the defect management information 
updating section 164 to retain the latest contents. 

Hereinafter, a procedure for additionally recording 
a new defect list 15 and DDS 14 into a defect management 
30 working area 21 while detexniining whether or not the defect 
list 15 and the DDS 14 have been normally recorded will be 
described step by step with reference to Figure 10. 



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- 44 - 

Step 1101: the defect management Information 
updating section 164 updates a DDS 14 contained in the defect 
management Information storage buffer 140 at the recording 
end position 40 contained In the defect management 
5 Information control memory 163, to which one has been added. 
In other words, the DDS 14 Is updated In such a manner that 
the defect list beginning positional information 30 
indicates the beginning position of an unrecorded defect 
management working area. After the DDS 14 is updated, the 
process goes to step 1102. 

Step 1102: the defect management working 
information writing section 166 records an updated defect 
list 15 contained in the defect management information 
storage buffer 140 to the beginning position of an unrecorded 
defect management working area. After recording, the 
process goes to step 1103. 

Step 1103 : it is determined whether or not the defect 
list 15 has been normally recorded. 

In this case, whether or not the defect list 15 has 
been normally recorded is performed by, for example, 
performing error correction for a block in which the defect 
list 15 is recorded or reading recorded data and determining 
whether or not the recorded data matches intended data. 

When it is determined that the defect list 15 has 
not been normally recorded (i.e., recording of the defect 
list 15 has failed), the process goes to step 1101. In 
step 1101 , the recording end position 40 is changed by adding 
the size of a defect list which has been previously recorded. 
In addition, the DDS 14 contained in the defect management 



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- 45 - 

Information storage buffer 140 is updated so that a position 
obtained by adds to one the recording end position 40 is 
contained in the defect list beginning positional 
information 30. 

5 

When it is determined that the defect list 15 has 
been normally recorded (i.e., recording of the defect list 15 
has been successful], the process goes to step 1104. 

10 Step 1104: the updated DDS 14 is recorded. After 

the DDS 14 is recorded, the process goes to step 1105. 

Step 1105: it is determined whether or not the DDS 14 
has been normally recorded. 

15 

When it is determined that the DDS 14 has not been 
normally recorded (i.e., recording of the DDS 14 has failed ) , 
the process goes to step 1104. 

20 When it is determined that the DDS 14 has been 

normally recorded (i.e., recording of the DDS 14 has been 
successful), the process is ended. 

Step 1102 and step 1103 are repeateduntil the defect 
25 list 15 has been normally recorded. Step 1104 and step 1105 
are repeated until the DDS 14 has been normally recorded. 

With the above -described procedure, the defect 
management working area updating section 165 additionally 
30 recordsanewdefect list ISandDDS 14 into a defect management 
working area 21 while determining whether or not the defect 
list 15 and the DDS 14 have been normally recorded. 



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Note that step 1101 and step 1102 may be performed 
in reverse order. Specifically, after a defect list 15 is 
recorded and it is confirmed that the recording has been 
normally achieved, a DDS 14 containing defect list beginning 
5 positional infoannation 30 is recorded into a defect 
management working area 21 in which the defect list 15 has 
been recorded. 

Note that although a defect list 15 and a DDS 14 are 
located in different blocks among a plurality of blocks in 
the procedure described in Figure 10, both a defect list 
15 and a DDS 14 may share at least one block among a plurality 
of blocks. 

If both a defect list 15 and a DDS 14 may share at 
least one block among a plurality of blocks, after a defect 
list 15 and a DDS 14 are recorded in a block shared by the 
defect list 15 and the DDS 14, it is determined whether or 
not the recording has been normally achieved. If the 
recording has failed, positional information is changed so 
that a position for a next recording corresponds to the defect 
list beginning positional infoimation 30 of a DDS 14, and 
a defect list 15 and a DDS 14 are recorded again in a block 
shared by the defect list 15 and the DDS 14. Recording of 
a defect list 15 and a DDS 14 is repeatedly attempted until 
the defect list 15 and the DDS 14 are normally recorded. 

Therefore, the data reliability of a defect list 15 
and a DDS 14 recorded in a defect management working area 
21 can be improved. 

Figure 11 shows a state in which a defect list 15 
and a DDS 14 are additionally recorded into a defect 



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- 47 - 

management working area 21 in accordance with the procedure 
described with reference to Figure 10. 

A portion (a) of Figure 11 shows a state In which 
5 a defect block is present in a defect management working 
area #1 (DMWA#1) , and therefore, first recording of a defect 
list 15 to the DMWA#1 has failed. Subsequently, recording 
of the defect list 15 is attempted. If recording of the defect 
list 15 is successful, a DDS 14 is recorded following the 
10 defect list 15. 

A portion (b) of Figure 11 shows a state in which 
no defect block is present In a DMWA#2. 

15 As described above, even If a defect block Is present 

in a defect management working area 21 and therefore recording 
of a defect list 15 and a DDS 14 falls, recording of the 
defect list 15 and the DDS 14 is repeatedly attempted TUitil 
the defect list 15 and the DDS 14 are normally recorded. 
Thereby, recording of a defect list 15 and a DDS 14 are 
appropriately performed. 

In the embodiment of Figure 9, step 901 corresponds 
to "selecting an unrecorded disc management working area 
neighboring a border between a recorded disc management 
working area and the unrecorded disc management working 
area"; step 902 corresponds to "recording disc management 
information, which is management information about a 
write-once read-many information recording medium, into to 
the unrecorded disc management working area neighboring the 
border" and "recording a disc definition structure containing 
positional information about disc management information 
defined in the above-described recording step into the 



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unrecorded disc management working area neighboring the 
border" . 

However, a procedure for additionally recording a 
5 defect list and a DDS into a defect management working area 
21 of the write- once read-many optical disc 1 according to 
Embodiment 1 of the present invention is not limited to that 
of Figure 9. Any procedure for additionally recording a 
defect list and a DDS into a defect management working area 

10 21 of the write- once read-many optical disc 1 according to 
Embodiment 1 of the present invention may be employed as 
long as the procedure has functions of "selecting an 
unrecorded disc management working area neighboring a border 
between a recorded disc management working area and the 

15 unrecorded disc management working area"; "recording disc 
management information, which is management information 
about a write-once read-many information recording medium, 
into to the unrecorded disc management working area 
neighboring the border" and "recording a disc definition 

20 structure containing positional information about disc 
management information defined in the above -described 
recording step into the unrecorded disc management working 
area neighboring the border" . 

25 Figure 12 shows a data structure of another 

write-once read-many optical disc 1 according to 
Embodiment 1 of the present invention. 

In the other write-once read-many optical disc 1 
30 according to Embodiment 1 of the present invention, at least 
one defect management working area 21 (DMWA#1 to DMWA#N (N: 
an integer of 1 or more)) is allocated in a direction from 
the end to the beginning of a temporary defect management 



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area 20 (in a direction from the outer periphery to the inner 
periphery of the write-once read-many optical disc 1). A 
DDS 14 and a defect list 15 are recorded sequentially from 
a defect management working area 21 at the end of the temporary 
defect management area 20 (closer to the outer periphery 
of the write-once read-many optical disc 1). 

A DDS 14 and a defect list 15 are provided in a defect 
management working area 21 in the same order as that of a 
DDS 14 and a defect list 15 provided in each of a DMAl to 
a DMA4. In a defect management working area 21, a defect 
list 15 and a DDS 14 are located in this order along a direction 
from the end to the beginning of the temporary defect 
management area 20 (i.e., in a direction from the outer 
periphery to the inner periphery of the write- once read-many 
optical disc 1 ) . 

A DDS 14 is located in , for example , a recorded defect 
management working area neighboring a border between the 
20 recorded defect management working area and an unrecorded 
defect management working area. The DDS 14 is located at 
a predetermined position which is calculated based on the 
beginning of the recorded defect management working area 
neighboring the border. 

25 

In the write-once read-many optical disc 1 of 
Figure 12, when searching for the latest recorded defect 
management working area 21, the defect management working 
information reading section 165 of the optical disc 
30 recording/reproduction apparatus 100 searches for the 
beginning position of recorded areas (hereinafter also 
referred to as "recording beginning position") in the 
temporary defect management area 20 and determines that a 



10 



15 



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-. 50 - 

defect management working area 21 located at the recording 
beginning position is the latest recorded defect management 
working area 21. In other words, in Figure 6. a recording 
beginning position is searched for where a recorded area 
5 is replacedwith an unrecorded area. In the defect management 
working information writing section 166, an unrecorded defect 
management working area, which is closer to the inner 
periphery than a recorded beginning area in the temporary 
defect management area 20 , is regarded as an available defect 
management working area 21. 

In the write-once read-many information recording 
medium of the present invention, at least one defect 
management working area is sequentially allocated in a 
predetermined direction. The latest defect list and the 
latest DDS are provided in a recorded defect management 
working area neighboring a border between the recorded defect 
management working area and an unrecorded defect management 
working area, wherein the latest defect list and the latest 
DDS are arranged in this order along the predetermined 
direction. Therefore, it is easy to find the latest DDS and 
the latest defect list. 

Hereinafter, an effect of the above-described 
write-once read-many information recording medium of the 
present invention, in which the predetermined direction is 
a direction from the inner periphery to the outer periphery 
of the write-once read-many optical disc 1 , will be described 
in detail. 

It is now assumed that the latest DFL 15 and the latest 
DDS 14 are arranged in a defect management working area 21 
in this order along the direction from the outer periphery 



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to the inner periphery of the write-once read-many optical 
disc 1 as with the latest DFL 15 and the latest DDS 14 in 
the DMAl to the DMA4. 

5 It is possible to search for a recording end position 

in the temporary defect management area 20 (Figure 8). 
However, the size of a DFL 15 varies depending on the number 
of defect entries . Therefore , it is not possible to calculate 
the beginning position of a DFL 15 from the end position. 

10 

In order to obtain the latest DFL 15 in the 
above-described data structure, the beginning position of 
a DFL 15 is calculated from a DDS 14 located at the beginning 
of the temporary defect management area 20, and the size 
15 of the DFL 15 is calculated from the number of defect entries 
contained in the DFL 15 to determine the position of the 
next DDS 14. Thebeginningposition of aDFL 15 is calculated 
from this DDS 14, • • • . In this manner, the temporary defect 
management area 20 is tracked sequentially. In the data 
20 structure in which a DDS 14 precedes a DFL 15, a long time 
is disadvantageously required. Moreover, if a block from 
which data cannot be reproduced is present in a DDS 14 and 
a DFL 15, a search for the latest DFL 15 is hindered, so 
that the reliability is disadvantageously lowered. 

If a DFL 15 has a fixed length, the problem with the 
search for the latest DDS 14 and the latest DFL 15 can be 
avoided. In this case, however, the number of times of 
additionally recording data into a temporary defect 
management area 20 is reduced or a larger size of temporary 
defect management area 20 is required, leading to a reduction 
in the efficiency of use of areas. 



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- 52 - 

In the write-once read-many optical, disc 1 of 
Embodiment 1, at least one defect management working area 
21 is allocated in a predetermined direction; the latest 
DFL 14 and the latest DDS 15 are arranged in this order along 
5 the predetermined direction and located in a recorded defect 
management working area neighboring a border • between the 
recorded defect management working area and an unrecorded 
defect management working area; if a DDS 14 is located at 
a predetermined position which can be calculated based on 
10 the border, a DFL 15 having a variable size can be utilized, 
resulting in a high efficiency of use of a defect management 
working area 21; and the recording position of the latest 
DFL 15 is recorded in a DDS 14 in a defect management working 
area 21 at the recording end position in the temporary defect 
15 management area 20 (i.e., a recorded defect management 
working area neighboring the border) . Therefore, the 
above-described problems can be solved. 

In the write -once read-many optical disc of the 
present invention, at least one defect management working 
area is allocated in a predetermined direction; the latest 
DFL and the latest DDS are arranged in this order along the 
predetermined direction and located in a recorded defect 
management working area neighboring a border between the 
recorded defect management working area and an unrecorded 
defect management working area; and a DDS is located at a 
predetermined position which can be calculated based on the 
border. Therefore, it is possible to easily find the latest 
DDS and the latest defect list. 

1.5. Finalization 

Figure 13 shows a procedtire for finalization 
according to Embodiment 1 of the present invention. By 



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recording a defect list 15 and a DDS 14 into each of the 
DMAl to the DMA4 of the write-once read-many optical disc 1 
of the present invention, the finalization of Embodiment 1 
of the present invention is performed. 

5 

Here, the contents of a defect list 15 stored in the 
defect management information storage buffer 140 are 
permitted by the defect management Information updating 
section 164 to retain the latest contents. 

10 

Hereinafter, the finalization procedure according 
to Embodiment 1 of the present invention will be described 
step by step with reference to Figure 13. 

15 Step 1001 : recording of a defect list 15 and a DDS 14 

into one (e.g., DMAl) of the DMAl to the DMA4 is started. 

Step 1002: the defect management information 
updating section 164 changes the latest DDS 14 to the last 

20 DDS 14 by changing positional information indicating the 
position of a recorded defect management working area 
neighboring a border to positional information Indicating 
the position of one of at least one defect management area. 
For example, the defect management information updating 

25 section 164 changes the latest DDS 14 to the last DDS 14 
by changing the defect list beginning positional information 
30 of a DDS 14 in the defect management information storage 
buffer 140 to the defect list beginning positional 
information of the defect management area (DMAl) to be 

30 recorded. After the defect list beginning positional 
information 30 is changed, the process goes to step 1003. 



Step 1003: the defect management information 



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- 54 - 

writing section 162 records the last defect list 15 into 
one of at least one defect management areas. For example, 
the defect management information writing section 162 records 
to the DMAl a defect list 15 in the defect management 
5 infonnation storage buffer 140. After the defect list 15 
is recorded, the process goes to step 1004. 

Step 1004: the defect management information 
writing section 162 records the last DDS 14 into one of at 
10 least one defect management areas based on the last defect 
list 15. For example, the defect management information 
writing section 162 records to the DMAl a DDS 14 in the defect 
management information storage buffer 140. After the 
DDS 14 is recorded, the process goes to step 1005. 

15 

Step 1005 : recording of a defect list 15 and a DDS 14 
into one (DMAl) of the DMAl to the DMA4 is completed. After 
recording is completed, the process goes to step 1001. 

20 Step 1002 to step 1004 are performed for all of the 

remaining defect management areas (i.e., the DMA2 to the 
DMA4}. 

After recording of a defect list 15 and a DDS 14 into 
25 the DMAl to the DMA4 is completed, f inalization is completed. 

Note that in step 1001 to step 1005 , the last defect 
list 15 is the latest defect list 15 located in at least 
one defect management area, and the last disc definition 
30 structure 14 is a disc definition structure 14 containing 
positional Information about the last defect list 15. The 
latest defect list 15 is generally a defect list 15 which 
is recorded in a recorded defect management working area 



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neighboring a border between the recorded defect management 
working area and an unrecorded defect management working 
area. The latest disc definition structure 14 is generally 
a disc definition structure 14 which contains positional 
5 information about the last defect list 15. 

With the above -described procedure, the defect 
management information processing section 160 can record 
the last DDS 14 and the last defect list 15 into the DMAl 
10 to the DMA4 for f inalization . 

Figure 14 shows data structures of a rewritable 
optical disc 400 and a write-once read-many optical disc 
after f inalization for comparison. 

15 

By performing the finalization procedure of 
Figure 13 , the data structure of the DMAl to the DMA4 provided 
in a write-once read-many optical disc after finalization 
is the same as the data structure of the DMAl to the DMA4 
20 provided in the rewritable optical disc 400. Thus, data can 
be reproduced from the finalized write-once read -many optical 
disc by the rewritable optical disc recording/reproduction 
apparatus 200 of Figure 24 , resulting in a compatible optical 
disc for reproduction. 

25 

Note that generally, in finalization, information 
having the same contents as those of a defect list 15 recorded 
in a recorded defect management working area neighboring 
a border between the recorded defect management working area 
30 and an unrecorded defect management working area is recorded 
in a defect management working area. Therefore, in an 
apparatus capable of handling the data structure of the 
write-once read-many optical disc of the present invention. 



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if the contents of the latest defect management working area 
21 can be obtained, it is not necessary to obtain the contents 
of the DMAl to the DMA4, so that a time required for obtaining 
defect management information can be reduced. Even when 
5 recording of a DDS 14 and a defect list 15 into the DMAl 
to the DMA4 is totally failed, data can be reproduced from 
the write-once read-many optical disc 1 by obtaining a DDS 14 
and a defect list 15 from the latest defect management working 
area 21. 

Thus, according to the finalization of the present 
invention, the data structure of a finalized write-once 
read-many optical disc is the same as the data structure 
of a rewritable optical disc. As a result, a rewritable 
optical disc recording/reproduction apparatus can reproduce 
data from a finalized write-once read-many optical disc, 
thereby obtaining compatibility. 

In the example of Figure 13, the defect management 
information writing section 162 functions as "a section for 
recording the last disc management information into at least 
one disc management area" and "a section for recording the 
last disc definition structure into at least one disc 
management area based on the last disc management 
information". However, the defect management information 
writing section 162 only shows an exemplary portion of the 
function of the present invention. A section having any 
constitution may be employed as long as the above- described 
function can be achieved. 

Note that the write-once read-many optical disc 1 
can be finalized by recording a finalization identifying 
flag onto the write-once read-many optical disc 1. 



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For example, the defect management working 
information writing section 166 records the f inalization 
identifying flag into at least one of a disc definition 
5 structure 14 and a defect list 15. 

Figure 15 shows another finalization procedure 
according to Embodiment 1 of the present invention. The 
other finalization is performed by recording a finalization 
10 identifyingflaginto thewrite-onceread-manyopticaldisc 1 
of the present invention. 

Hereinafter, the other finalization procedure 
according to Embodiment 1 of the present invention will be 
15 described step by step with reference to Figure 15. 

Step 2201: a finalization identifying flag is 
recorded onto the write-once read-many optical disc 1. The 
finalization identifying flag is recorded at a predetermined 
20 position on the write-once read-many optical disc 1. The 
predetermined position is any position from which the optical 
disc recording/reproduction apparatus of the present 
invention can read the finalization identifying flag. 

25 If the predetermined position is a defect management 

working area 21, the defect management working information 
writing section 166 records the finalization identifying 
flag into at least one of a disc definition structure 14 
and a defect list 15 in a defect management working area 21. 

30 In this case, the defect management working information 
reading section 165 reads the finalization identifying flag . 

After the finalization identifying flag is recorded 



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Into at least one of a disc definition structure 14 and a 
defect list 15, the process Is ended. 

1.6. Flnallzatlon determination 
5 Figure 16 shows a flnallzatlon determination 

procedure for determining whether or not the write-once 
read-many optical disc 1 is already finalized. Hereinafter, 
the flnallzatlon determination procedure (step 2301 to 
step 2303) for determining whether or not the write-once 
10 read-many optical disc 1 is already finalized will be 
described step by step with reference to Figure 16 . 

Note that in step 2301 to step 2303, the last defect 
list 15 is the latest defect list 15 provided in at least 

15 one defect management area; the last disc definition 
structure 14 Is a disc definition structure 14 containing 
positional Information about the last defect list 15; and 
the latest defect list 15 Is a defect list 15 which is recorded 
in a recorded defect management working area neighboring 

20 a border between the recorded defect management working area 
and an unrecorded defect management working area. 

Step 2301: the defect management information 
reading section 161 selects one of at least one defect 
25 management areas allocated in the write-once read-many 
optical disc 1. After one of at least one defect management 
areas Is selected, the process goes to step 2302. 

Step 2302: the defect management information 
30 reading section 161 reads out data from one of the at least 
one defect management areas allocated in the write-once 
read-many optical disc 1 and determines whether or not the 
defect management area has been recorded. For example, the 



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defect management information reading section 161 reads out 
data from one of the DMAl to the DMA4, and based on the result 
of reading, determines whether or not the last defect list 
and the last DDS are recorded in one of the DMAl to the DMA4 . 

5 

If the amplitude value of a read signal indicating 
the result of reading data is greater than or equal to a 
predetermined threshold value, it is determined that the 
defect management area has been recorded . If the amplitude 

10 value of a read signal indicating the result of reading data 
does not exceed the predetermined threshold value, it is 
determined that the defect management area is unrecorded. 
For example, data is read from the DMAl, and based on the 
result of reading, it is determined whether or not the DMAl 

15 has been recorded. 

Data to be read out is not limited to the last defect 
list 15 and the last DDS 14. The contents of the data are 
not particularly limited as long as the data is used to 
20 determine whether or not a defect management area has been 
recorded in accordance with the procedure described with 
reference to Figures 6 and 7. 

The procedure for determining whether or not a defect 
25 management area has been recorded is similar to the procedure 
described in Figures 6 and 7 and the description is omitted. 
Note that in the procedure described in Figures 6 and 7 the 
defect management working information reading section 165 
examines amplitude, while in the finalization determination 
30 procedure the defect management information reading 
section 161 examines amplitude. 



Note that the procedure for determining whether or 



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- 60 - 

not a defect management area has been recorded is not limited 
to the procedure described in Figures 6 and 7 . By examining 
whether or not data is correctly read out , it may be determined 
whether or not a defect management area has been recorded. 
5 For example, based on the result of examining whether or 
not the last defect list 15 or the last DDS 14 is correctly 
read from a defect management area, it is determined whether 
or not a defect management area has been recorded. 

10 If a defect management area has been recorded, it 

is determined that the write-once read-many optical disc 1 
is changed from a write-once read-many state to a 
non-write-once read-many state, and the process is ended. 

15 If a defect management area is not recorded, it is 

determined that the write-once read-many optical disc 1 has 
not been changed from the write-once read-many state to the 
non-write-once read-many state, and the process goes to 
step 2303. 

20 

Step 2303; the defect management information 
reading section 161 determines whether or not all of the 
at least one defect management areas allocated in the 
write-once read-many optical disc 1 are already selected. 

25 

If all of the defect management areas are already 
selected, it is determined that the write -once read-many 
optical disc 1 has not been changed from the write-once 
read-many state to the non-write-once read-many state, and 
30 the process is ended. 

If not all of the defect management areas are already 
selected, the process goes to step 2301. 



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- 61 - 



If it is determined that at least one of the DMAl 
to the DMA4 has been recorded, it is determined that the 
write-once read-many optical disc 1 has been changed from 
5 the write-once read-many state to the non-write-once 
read-many state. If it is determined that all of the DMAl 
to the DMA4 are unrecorded, it is determined that the 
write-orice read-many optical disc 1 has not been changed 
from the write- once read-many state to the non-write-once 
10 read-many state. 

For example, the defect management information 
reading section 161 reads out data from at least one of the 
DMAl to the DMA4. If data is normally reproduced, it is 
15 determined that the write-once read-many optical disc 1 has 
been finalized. If all of the DMAl to the DMA4 are unrecorded 
and therefore data cannot be normally reproduced from these 
defect management areas , it is determined that the write-once 
read-many optical disc 1 has not been finalized. 

20 

In the embodiment of Figure 16, step 2302 
corresponds to "reading out data from one of at least one 
disc management areas and determining whether or not the 
defect management area has been recorded" and step 2303 
25 corresponds to "determining, based on the result of the 
above-described determination, whether or not a write-once 
read-many information recording medium has been changed from 
a write-once read-many state to a non-write-once read-many 
state" . 

30 

However, a f inalization determination procedure for 
determining whether or not the write-once read-many optical 
disc lisalreadyfinalizedisnot limited to that of Figure 16. 



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Any f inalizatlon determination procedure for determining 
whether or not the write-once read-many optical disc 1 is 
already finalized can be employed as long as it has functions 
of "reading out data from one of at least one disc management 
5 areas and determining whether or not the defect management 
area has been recorded" and "determining, based on the result 
of the above-described determination, whether or not a 
write- once read-many information recording medium has been 
changed from a write-once read-many state to a non -write-once 
read-many state" . 

Figure 17 shows another f inalizatlon determination 
procedure for determining whether or not the write -once 
read-many optical disc 1 is already finalized. Hereinafter, 
the other finalization determination procedure for 
determining whether or not the write- once read-many optical 
disc 1 is already finalized will be described step by step 
with reference to Figure 17. 

Step 2401 : the optical disc recording/reproduction 
apparatus 100 reads out data from the write-once read-many 
optical disc 1. For example, the defect management working 
information reading section 165 reads out data from a 
recorded defect management working area 21 neighboring a 
border between the recorded defect management working area 
and an unrecorded defect management working area. A 
procedure for reading out data is similar to that which is 
described in Figure 5 and the description is omitted. 

After data is readout , the process goes to step 2402. 

Step 2402: it is determined whether or not a 
finalization identifying flag has been recorded on the 



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write-onoe read-many optical disc 1. For example, based on 
the read data, the defect management working information 
reading section 165 determines whether or not the 
finalization identifying flag has been recorded at a 
5 predetermined position in a defect management working area 
21. Note that the recording position of the finalization 
identifying flag is not limited to a predetermined position 
of a defect management working area 21. The recording 
position of the finalization identifying flag may be any 
10 position that can be read out by the optical disc 
recording/reproduction apparatus 100. The predetermined 
position may be , for example , at least one of a disc definition 
structure 14 and a defect list 15. 

1 5 Based on the result of determination., it is determined 

whether or not the write-once read-many optical disc 1 has 
been changed from a write-once read-many state to a 
non- write -once read-many state. 

20 If a finalization identifying flag has been recorded, 

it is determined that the write-once read-many optical disc 1 
has been changed from the write-once read-many state to the 
non-write-once read-many state and the process is ended. 

If a finalization identifying flag has not been 
recorded, it is determined that the write-once read-many 
optical disc 1 has not been changed from the write- once 
read-many state to the non-write-once read-many state and 
the process is ended. 

For example, when a finalization identifying flag 
is read from at least one of a disc definition structure 
14 and a defect list 15, the defect management working 



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Information reading section 165 determines that the 
write-once read-many optical disc 1 has been finalized. 

In the embodiment of Figure 17, step 2402 
5 corresponds to "determining whether or not a flnallzation 
identifying flag indicating prohibition of additional 

recording of data into at least one disc management working 
area is recorded in a write-once read-many information 
recording medium" and "determining, based on the result of 
10 the above-described determination, whether or not the 
write -once read-memy information recording medium has been 
changed from a write-once read-many state to a non -write- once 
read-many state". 

15 However, the other flnallzation determination 

procedure for determining whether or not the write- once 
read-many optical disc 1 has been finalized is not limited 
to that of Figure 17. Any flnallzation determination 
procedure for determining whether or not the write -once 

20 read-many optical disc 1 has been finalized can be employed 
as long as it has functions of "determining whether or not 
a flnallzation identifying flag Indicating prohibition of 
additional recording of data into at least one disc management 
working area is recorded in a write -once read-many 

25 information recording medium" and "determining, based on 
the result of the above- described determination, whether 
or not the write -once read-many information recording medium 
has been changed from a write- once read-many state to a 
non-wrlte-once read-many state". 

30 

Note that Embodiment 1 of the present invention is 
described assuming that each of a defect list (DFL) 15 and 
a disc definition structure (DDS) 14 has a block unit which 



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is a unit for error correction. If the size of a DDS 14 or 
the size of a DFL 15 is less than the block size, the blank 
portion of a block is recorded with meaningless data (e.g. , 
0) to fill the block. 

5 

A DFL 15 and a DDS 14 are provided in different blocks 
in the foregoing description. However , if a DDS 14 is located 
at a predetermined position in a predetermined block, which 
can be calculated based on a border, among blocks contained 
10 in a recorded defect management working area neighboring 
the border, a DFL 15 and a DDS 14 may share at least one 
blocks. For example, a DDS 14 may be located at a 
predetermined position in the last block of a DFL 15. As 
long as the position of a DDS 14 is uniquely determined based 
5 on a recording end, it is possible to easily find the latest 
DDS 14 and DFL 15. 

In Embodiment 1 of the present invention, a block 
which is a unit for error correction is described as a unit 
for recording/ reproduction and defect management . However , 
for example, a sector which is an accessible minimum unit 
( 1 sector has a size of 2 KBytes ) may be employed as a unit 
for recording/reproduction and defect management in the 
present invention. Such modification can be made without 
departing from the spirit and scope of the present invention. 
Modifications and variations obvious to those skilled in 
the art are within the scope of the claims of the present 
invention. 

In Embodiment 1 of the present invention, a defect 
management working area 21 contains a defect list 15 (i.e. , 
child information) and a DDS 14 (i.e., parent information) 
containing positional information about the defect list 15 . 



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However, the number of pieces of child information is not 
limited to one as long as the parent Information contains 
positional information about the child information. A 
plurality of pieces of child information may be present in 
5 a defect management working area 21 . In other words , parent 
information may contain positional information about a 
plurality of pieces of child information. In this case, the 
same effect can be obtained. 

0 ( Embodiment 2 ) 

2.1. Optical disc data structure 
A write-once read-many optical disc 300 according 
to Embodiment 2 of the present invention has the same data 
structure as that of Embodiment 1 of the present invention, 
except for the defect management working area 21 (DMWA). 
The description is omitted except for that of the defect 
management working area 21 (DMWA). 

Figure 18 shows a data structure of a DMWA according 
to Embodiment 2 of the present invention. 

A DMWA contains M blocks (M is an integer of 1 or 
more). In each of the M blocks, a subsidiary defect list 
(hereinafter also referred to as "SDFL") 18 and a subsidiary 
disc definition structure (hereinafter also referred to as 
"SDDS") 19 are provided. 

A SODS 19 is information having a fixed size (e.g. , 
1 sector (2 KBytes)). A SDDS 19 is located at a 
predetermined position (e.g., the end sector of a block) 
in each block contained in a DMWA. 



The size of a SDDS 19 is the same as that of a disc 



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definition structure (DDS) 14. 

Note that the size of a SDDS 19 is not limited to 
the size of a DDS 14. 

5 

Note that a SDDS 19 may not have a fixed length as 
long as a SDDS 19 is located at a predetermined position 
of each block. 

If the size of a defect list (DFL) 15 is added to 
the size of a SDDS 19 and the sum exceeds the size of 1 block, 
the DFL 15 is divided into SDFLs 18 so that the size of a 
SDDS 19 plus the size of SDFL(s) 18 is within the size of 
1 block. A combination of all SDFLs 18 is a DFL 15. 

A SDFL 18 is a division of a DFL 15. Therefore, 
defect list header 32 is located at a predetermined position 
in any of SDFLs 18 (e.g., the beginning of a SDFL #1). 

The size of a DFL 15 is a variable length, so that 
the number of SDFLs 18 and the size of a SDFL 18 are variable . 
The addition of the size of a SDFL 18 and the size of a SDDS 19 
is necessarily within the size of 1 block. 

Here, if the addition of the size of a SDFL 18 and 
the size of a SDDS 19 is less than the size of 1 block, the 
blank portion of a block is recorded with meaningless data 
(e.g., 0) to fill the block. 

Figure 19 shows a structure of a SDDS 19. 

A SDDS 19 contains subsidiary defect list beginning 
positional information 34 which is positional information 



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about all SDFLs 18 present In a DMWA. 

Note that a SDDS 19 may contain subsidiary defect 
list beginning positional information 34 for not all SDFLs 18 
5 For example, a SDDS 19 may contain subsidiary defect list 
beginning positional information 34 only about a beginning 
SDFL 18, an end SDFL 18, and SDFL(5) 18 constituting the 
Scune block. 

10 2.2. Configuration of an optical disc 

recording/reproduction apparatus 

An optical disc recording/reproduction apparatus 

according to Embodiment 2 of the present invention has the 

same configuration as that of the optical disc 
15 recording/reproduction apparatus 100 according to 

Embodiment 1 of the present invention and the description 

is omitted. 

2.3. Obtaining latest defect management information 
20 A method for obtaining (reproducing) information (a 

SDDS and a SDFL recorded in a recorded defect management 
working area neighboring a border between the recorded defect 
management working area and the unrecorded defect management 
working area) recorded in a write-once read-many optical 
25 disc 300 according to Embodiment 2 of the present invention, 
will be described below. 

Figure 20 shows a procedure for obtaining a SDDS 19 
and a SDFL 18 from the latest recorded defect management 
30 working area 21 among the defect management working areas 
21 contained in the temporary defect management area 20. 
Hereinafter, this procedure will be described step by step 
with reference to Figure 20. 



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Step 1901: the defect management working 
Information reading section 165 searches for the position 
of a border between a recorded defect management working 
5 area and an unrecorded defect management working area to 
obtain border positional information indicating the border 
position. 

For example, the defect management working 
information reading section 165 searches the recording end 
position of the temporary defect management area 20 and 
stores the position of a defect management working area 21 
located at the recording end position into the defect 
management information control memory 163 at the recording 
end position 40 . After the position of the defect management 
working area 21 at the recording end position is stored, 
the process goes to step 1902. 

Note that a procedure for searching for the recording 
end position is the same as the procedure described in 
Embodiment 1 of the present invention with reference to 
Figures 6 and 7 and the description is omitted. 

Step 1902: the defect management working 
information reading section 165 reproduces a SDDS 19 from 
a block contained in a recorded defect management working 
area neighboring a border based on border positional 
information, and based on the reproduced SDDS 19, obtains 
positional information about a SDFL 18. 

For example, the defect management working 
information reading section 165 reads out a SDDS 19 having 
a fixed length located at a predetermined position in a block 



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Which ends at the recording end position 40 into the defect 
management information storage buffer 140, and stores all 
subsidiary defect list beginning positional information 34 
in the SDDS 19 into the defect management information control 
5 memory 163 at a SDFL beginning position 42. After all 
subsidiary defect list beginning positional information 34 
in the SDDS 19 is stored, the process goes to step 1903. 

Step 1903: the defect management working 
10 information reading section 165 determines whether or not 
a recorded defect management working area is an area in which 
recording has been normally completed, based on positional 
information about a SDFL 18 contained in a SDDS 19. 

For example, the defect management working 
information reading section 165 uses positional information 
about the SDFL beginning position 42 to determine whether 
or not a DMWA containing a SDDS 19 in which reading has been 
performed is a normal defect management working area. 

For example, by comparing positional information 
about a SDFL 18 with positional information about a border 
between a recorded defect management working area and an 
unrecorded defect management working area, the defect 
management working information reading section 165 
determines whether or not the recorded defect management 
working area is an area in which recording has been normally 
completed . 

30 Specifically, for example, if no address greater than 

the recording end position 40 is present in the positional 
information about the SDFL beginning position 42, a DMWA 
to be read out is determined to be normal. If an address 



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greater than the recording end position 40 is present, a 
DMWA to be read out is determined to be abnormal. 

Note that the above-described determination method 
5 is only illustrative. A method for determining whether or 
not a DMWA is normal is not limited to this. 

If a recorded defect management working area is an 
area in which recording has not been completed normally, 
10 the position of a border between a recorded defect management 
working area neighboring the border and a recorded defect 
management working area neighboring the recorded defect 
management working area is searched for based on positional 
information about a SDFL 18. 

15 

For example, if a DMWA to be read out is determined 
to be abnormal, a normal DMWA which is present immediately 
before a current DMWA to be read out in a direction toward 
the beginning of the temporal^ defect management area 20, 
20 i.e., a DMWA whose end is located immediately before the 
SDFL beginning position 42 indicating the subsidiary defect 
list #1 beginning positional information 34, is read out. 

A DMWA from which data is currently being read is 
25 determined to be abnormal, for example, when a DMWA which 
has not been completely updated since, for example, the 
optical disc recording/reproduction apparatus 100 had been 
shut down during updating of the DMWA or when the DMWA has 
a defect, such as a scar, a fingerprint, or the like. 



If a DMWA is determined to be a normal defect 
management working area, the process goes to step 1904. 



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If a DMWA is determined to be not a normal defect 
management working area, the process goes to step 1902. 

Step 1904: the defect management working 
5 information reading section 165 reproduces a SDFL 18 from 
each of a plurality of blocks contained in a recorded defect 
management working area neighboring a border, based on 
positional information about the SDFL 18. 

10 For example, the defect management working 

information reading section 165 reads out all SDFLs 18 
located beginning from the SDFL beginning position 42 into 
the defect management information storage buffer 140. 

15 Here , if the recording end position 40 indicates that 

no temporary defect management area 20 has been recorded, 
no reading has to be performed in step 1902, step 1903 and 
step 1904. Instead of reading, a DDS 14 and a defect list 15 
may be stored in the defect management information storage 
buffer 140 in advance. Note that the stored DDS 14 contains 
the defect list beginning positional information 30 which 
has been initialized to a predetermined value, and in the 
stored defect list 15, the number of defect entries in the 
defect list header 32 has been initialized (the number of 
defect entries = 0), i.e., the stored defect list 15 has 
no defect entry 33. 

Note that the defect management information storage 
buffer 140 may retain all SDFLs 18, which have been read 
out, as a combination which forms a DFL 15 or as they are. 
In Embodiment 2 of the present invention , all SDFLs 18 , which 
have been read out, are combined into a DFL 15 and are retained. 



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In Embodiment 2 of Figure 20, step 1901 corresponds 
to "searching for the position of a border between a recorded 
disc management working area and an unrecorded disc 
management working area to obtain border positional 
5 information indicating the border position", step 1902 
corresponds to "reproducing a disc definition structure from 
a recorded disc management working area neighboring the 
border, based on the border positional information" and 
"obtaining positional information about partial disc 
management information, based on the disc definition 
structure", and step 1904 corresponds to "reproducing 
partial disc management information from each of a plurality 
of blocks contained in the recorded disc management working 
area neighboring the border, based on positional information 
about the partial disc management information" . 

However, a procedure for obtaining a SDDS 19 and a 
SDFL 18 from the latest recorded defect management working 
area 21 among the defect management working areas 21 contained 
in the temporary defect management area 20 is not limited 
to that of Figure 20 • Any procedure for obtaining a SDDS 19 
and a SDFL 18 from the latest recorded defect management 
working area 21 among the defect management working areas 
21 contained in the temporary defect management area 20 may 
be employed as long as it has functions of "searching for 
the position of a border between a recorded disc management 
working area and an unrecorded disc management working area 
to obtain border positional information indicating the border 
position", "reproducing a disc definition structure from 
a recorded disc management working area neighboring the 
border, based on the border positional information" and 
"obtaining positional information relating partial disc 
management information, based on the disc definition 



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Structure", and "reproducing partial disc management 
information from each of a plurality of blocks contained 
in the recorded disc management working area neighboring 
the border, based on positional information about the partial 
5 disc management information" . 

Thus, according to the present invention, by locating 
a SDDS containing positional infomation about a SDFL at 
a predetermined position in all blocks contained in a DMWA, 
it is possible to easily determine, from information in the 
SDDS, whether or not the DMWA has been normally updated. 
Even if updating of the DMWA has failed, positional 
information of a normal DMWA present immediately before that 
DMWA can be easily calculated. 

2.4. Update of defect management information 
A method for recording information ( SDFL and SDDS ) 
onto the write-once read-many optical disc 300 according 
to Embodiment 2 of the present invention will be described 
below. 

Figure 21 shows a procedure for additionally 
recording a SDFL 18 and a SDDS 19 into a defect management 
working area 21 of the write-once read-many optical disc 300 
according to Embodiment 2 of the present invention. 

The defect management working information writing 
section 166 additionally records a SDFL 18 and a SDDS 19 
into a defect management working area 21. 

Here, the contents of a defect list 15 stored in the 
defect management information storage buffer 140 is 
permitted by the defect management information updating 



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section 164 to retain the latest contents. 

Specifically, for example, if a defect block is newly 
detected, the defect management information updating 
5 section 164 adds a defect entry corresponding to a new 
replacement block (i.e., a new defect block) to the defect 
list 15 stored in the defect management information storage 
buffer 140, and sorts defect entries in accordance with 
positional information about the defect block contained in 
0 the defect entry. Further, the defect management 
information updating section 164 increases the number of 
defect entries in a defect list header by one. 

Hereinafter, a procedure for additionally recording 
a SDFL 18 and a SDDS 19 into a defect management working 
area 21 of the write-once read-many optical disc 300 according 
to Embodiment 2 of the present invention will be described 
step by step with reference to Figure 21. 

Step 2001: the defect management information 
updating section 164 calculates the size of the latest DFL 15 
stored in the defect management information storage 
buffer 140 and determines whether or not the addition of 
the size of a SDDS 19 (fixed size) and the size of the latest 
DFL 15 exceeds the size of 1 block. 

If the size of the addition exceeds the size of 1 block, 
the DFL 15 is divided into a plurality of subsidiary defect 
lists 18. 

If the size of the addition is smaller than or equal 
to the size of 1 block, the DFL 15 itself is defined as a 
subsidiary defect list 18#1. 



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The Size of a subsidiary defect list 18 Is determined 
so that the maximum size of the addition of the size of a 
subsidiary defect list 18 and the size of a SDDS 19 (fixed 
5 size) Is the size of 1 block. 

Specifically, it is now assumed that the optical disc 
300 Is a DVD-RAM and the size of 1 block Is 1 ECC block (=16 
sectors) which is a unit for error correction. If the size 
10 of a SDDS 19 is 1 sector, the size of a subsidiary defect 
list 18 is 15 sectors at maximum. 

Step 2002: the defect management information 
updating section 164 selects an unrecorded defect management 
15 working area neighboring a border between a recorded defect 
management working area and the unrecorded defect management 
working area. 

For example, the defect management Infomnation 
20 updating section 164 selects an unrecordeddefect management 
working area located at the beginning of a plurality of 
unrecorded defect management working areas by updating a 
SDDS 19 contained in the defect management information 
storage buffer 140 defect management Information control 
25 memory 163 where a position obtained by adds to one the 
recording end position 40, I.e. , the beginning position of 
an unrecorded area Is regarded as the subsidiary defect list 
#1 beginning positional information 34. If there are M 
subsidiary defect lists 18 (M is an integer of 2 or more) , 
30 subsidiary defect list beginning positional Information 34 
corresponding to each subsidiary defect list 18 contained 
in a SDDS 19 is updated. 



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Here, subsidiary defect list #2 beginning positional 
information, • • ■ , and subsidiary defect list #M beginning 
positional information can be calculated using the subsidiary 
defect list #1 beginning positional information and the block 
5 size . Specifically, for example, the subsidiary defect list 
#2 beginning positional information can be calculated as 
a position obtained by adding to 1 block size to a position 
indicated by the subsidiary defect list #1 beginning 
positional information. 

Step 2003: the defect management working 
information writing section 166 records a SDFL 18 contained 
in a defect list 15, which is management information about 
a write-once read-many optical disc, and a SDDS 19 containing 
positional information about the SDFL 18, into each of a 
plurality of blocks contained in the unrecorded defect 
management working area neighboring the border. 

For example, the defect management working 
information writing section 166 records an updated SDFL 18 
and an updated SDDS 19 contained in the defect management 
information storage buffer 140 into the unrecorded area from 
the beginning position. If there are M SDFLs 18, M updated 
SDFLs 18 and M updated SDDSs 19 are recorded. 

Here, when a SDDS 19 contains subsidiary defect list 
beginning positional information 34 for all SDFLs 18, the 
contents of the SDDSs 19 recorded along with the SDFLs 18 
are the same for all the SDFLs 18. However, for example, 
if a SDDS 19 contains subsidiary defect list beginning 
positional information 34 about a beginning SDFL 18, 
subsidiary defect list beginning positional information 34 
about an end SDFL 18, and subsidiary defect list beginning 



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positional Information 34 about SDFL(s) 18 contained In the 
same block, only the subsidiary defect list beginning 
positional Information 34 about SDFL ( s } 18 contained In the 
same block have different contents. 

5 

Also in Embodiment 2 of the present Invention, a 
SDFL 18 and a SDDS 19 can be recorded while determining 
whether or not recording has been performed normally as in 
Embodiment 1 of the present invention described in Figure 10 . 
In Embodiment 2 of the present invention, when a SDFL 18 
and a SDDS 19 can be recorded while determining whether or 
not recording has been normally performed, step 2003 is 
repeatedly performed until the SDFL 18 and the SDDS 19 are 
normally recorded. 

As in Embodiment 1 of the present Invention described 
in Figure 10 , when a DMHA is updated while determining whether 
or not recording has been normally performed. If a defect 
block is encountered during the process, it is possible that 
subsidiary defect list beginning positional Information 34 
indicated by a SDDS 19 in a previously recorded block does 
not match a position at which a subsidiary defect list 18 
is actually recorded. However, in this case, by updating 
the contents of the SDDS 19 In the defect management 
Information storage buffer 140 so that the contents of the 
SDDS 19 contained in the latest recorded block (I.e., a block 
located at the recording end position) are correct, matching 
can be achieved, thereby making it possible. to avoid the 
above -described problem. 

With the above-described procedure, the defect 
management working information writing section 166 can record 
the latest defect list 15 and DDS 14 into a defect management 



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working area 21 contained in the temporary defect management 
area 20. 

In Embodiment 2 of Figure 21, step 2002 corresponds 
5 to "selecting an unrecorded disc management working area 
neighboring a border between a recorded disc management 
working area and the unrecorded disc management working area" , 
step 2003 corresponds to "recording partial disc management 
Infoinnation contained in disc management information, which 
is management information about a write-once read-many 
information recording medium, into each of a plurality of 
blocks contained in the unrecorded disc management working 
area neighboring the border" and "recording a disc definition 
structure contained in positional information about partial 
disc management information into each of a plurality of blocks 
contained in the unrecorded disc management working area 
border neighboring the border" . 

However, a procedure for additionally recording a 
SDFL 18 and a SDDS 19 into a defect management working area 
21 of the write-once read-many optical disc 300 according 
to Embodiment 2 of the present Invention Is not limited to 
that of Figure 21 . Any procedure for additionally recording 
a SDFL 18 and a SDDS 19 into a defect management working 
area 21 of the write-once read-many optical disc 300 according 
to Embodiment 2 of the present invention can be employed 
as long as It has functions of "selecting an unrecorded disc 
management working area neighboring a border between a 
recorded disc management working area and the unrecorded 
disc management working area", "recording partial disc 
management information contained in disc management 
inf oannation, which is management information about a 
write-once read-many information recording medium. Into each 



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Of a plurality of blocks contained in the unrecorded disc 
management working area neighboring the border" and 
"recording a disc definition structure contained in 
positional information about partial disc msmagement 
5 information into each of a plurality of blocks contained 
in the unrecorded disc management working area border 
neighboring the border" . 

2.5. Finalization 

A finalization procedure according to Embodiment 2 
of the present invention is the same as the finalization 
procedure according to Embodiment 1 of the present invention 
and the description is omitted. In the finalization 
procedure according to Embodiment 2 of the present invention , 
subsidiary defect list beginning positional information 34 
contained in a SDDS 19 of Embodiment 2 of the present 
invention substitutes for defect list beginning positional 
information 30 contained in a DDS 14 of Embodiment 1 of the 
piresent invention and the finalization procedure of 
Embodiment 1 of the present invention is performed. 

2.6. Finalization determination 

A finalization determination procedure according to 
Embodiment 2 of the present invention is the same as the 
finalization determination procedure according to 
Embodiment 1 of the present invention and the description 
is omitted. 

Thus, according to the present invention, even when 
update of a defect management working area 21 is incomplete 
since the power is cut or the like, it is correctly determined 
that update has failed. Therefore, it is possible to easily 
find the beginning position of a defect management working 



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area 21 in which update has failed. Therefore, it is possible 
to easily obtain a defect list 15 in the latest normal defect 
management working area 21. 

5 In Embodiment 2 of the present invention, a block 

which is a unit of error correction is described as a unit 
of reproduction/recording and defect management. 
Alternatively, for example, a sector which is the smallest 
addressable unit (1 sector has a size of 2 KBytes) may be 
10 used as a unit of reproduction/recording and defect 
management. It will be clearly appreciated that such 
variations and modifications may be made without departing 
from the spirit and scope of the present invention. 

Although a defect list 15 or a subsidiary defect 
list 18 (i.e., child information) and a DDS 14 or a SDDS 19 
(i.e., parent information) containing positional 
information about the defect list 15 or the subsidiary defect 
list 18 are provided in a defect management working area 
21 in Embodiments 1 and 2 of the present invention, 
information provided is not limited to a defect list 15 or 
a subsidiary defect list 18 and a DDS 14 or a SDDS 19. 

For example, when the information provided is disc 
25 management information, which is management information 
about a disc, and a disc definition structure containing 
positional information about the disc management information, 
at least one defect management working area is allocated 
sequentially in a predetermined direction. When the latest 
30 disc management information and the latest disc definition 
structure are located in this order along the predetermined 
direction in a recorded disc management working area 
neighboring a border between the recorded disc management 



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working area and an unrecorded defect management working 
area, it is possible to easily search for the latest disc 
management information. Thus, the effect of the present 
invention can be obtained. 

5 

For example, the information provided may be a 
replacement list andaDDS containing positional information 
about the replacement list. The replacement list contains 
correspondence relationship information indicating a 
10 correspondence relationship between an area (replacement 
source) contained in a data area and an area (replacement 
destination) contained in a spare area. 

In Embodiments 1 and 2 of the present invention, a 
15 defect management working area 21 contains a defect list 
15 or a subsidiary defect list 18 (i.e., child information) 
and a DDS 14 or a SDDS 19 (i.e., parent information ) 
containing positional information about the defect list 15 . 
However, the number of pieces of child information is not 
20 limited to one as long as the parent information contains 
positional Information about the child information. A 
plurality of pieces of child information may be present in 
a defect management working area 21 . In other words , parent 
Information may contain positional information about a 
25 plurality of pieces of child information. The plurality of 
pieces of child information may not be necessarily of the 
same type. 

Figure 22 shows an exemplary defect management 
30 working area in which a space bit map Information and a defect 
list are provided as child information. 

In a defect management working area 21, space bit 



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map information and a defect list are provided as child 
information. A DDS (parent information) may contain 
positional information about these two pieces of child 
information. In this case, if a DDS indicating positional 
5 information about child information (i.e.. parent 
information) is located at a predetermined position which 
can be calculated based on a border between a recorded defect 
management working area and an unrecorded defect management 
working area (the end of the recorded defect management 
10 working area or the beginning of the recorded defect 
management working area), it is possible to easily find the 
latest child information. Thus, the effect of the present 
invention can be obtained. 

15 When a defect block is present in a recorded defect 

management working area 21 as described with reference to 
Figures 10 and 11 , if arecording end position is only searched 
for by the procedure described in Figures 6 and 7, it is 
possible that a defect block is incorrectly determined to 

20 be an unrecorded area. Therefore, recording end positional 
information obtained by the procedure described in Figures 6 
and 7 is compared with retained information to determine 
whether or not the recording end positional information is 
the beginning position of an appropriate unrecorded area, 

25 for example. Thus, erroneous determination can be avoided. 
Here , the retained information means recording end positional 
information (LRA) made in the previous recording of a 
temporary defect management area 20 , positional information 
about a defect block, or the like, which is retained at a 

30 predetermined position on a medium or a memory (nonvolatile) 
in an optical disc recording/reproduction apparatus, for 
example . 



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In the foregoing description of the present invention , 
a write-once read-many optical disc is employed as an 
information recording medium. However, an information 
recording medium is not limited to a write- once read-many 
5 optical disc. Any write-once read-many information 
recording medium may be employed, and in this case, the same 
effect as that of the above-described embodiments of the 
present invention can be obtained. 

According to an aspect of the present invention , there 
is provided a finalization determination method for 
determining whether or not a write-once read-many information 
recording medium is already finalized, wherein: 

at least one disc management working area is allocated 
on the write -once read-many information recording medium; 

the finalization determination method comprising 
the steps of; 

(a) determining whether or not a finalization 
identifying flag is recorded on the write-once read-many 
information recording medium, the finalization identifying 
flag indicating prohibition of additional recording data 
into the at least one disc management working area; and 

(b) determining, based on a result of the step (a) , 
whether or not the write -once read-many information recording 
medium is changed from a write -once read-many state to a 
non -write- once read-many state. 

In one embodiment of this invention, in the at least 
one disc management working area , disc management information , 
30 which is management information about the write-once 
read-many information recording medium , and a disc def inition 
structure containing positional information about the disc 
management information, are provided; and ' 



15 



20 



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the step (a) comprises determining whether or not 
the flnalizatlon identifying flag is recorded in at least 
one of the disc definition structure and the disc management 
Information. 

5 

According to another aspect of the present Invention, 
there is provided a finalization determination method for 
determining whether ornot a write-once read-many information 
recording medium is already finalized, wherein: 

10 at least one disc management working area and at least 

one disc management area are allocated on the write-once 
read-many information recording medium; 

in the at least one disc management working area, 
disc management information, which is management information 

15 about the write-once read-many Information recording medium, 
and a disc definition structure containing positional 
Information about the disc management information, are 
recorded; and 

the finalization determination method comprising 

20 the steps of: 

(a) reading data from one of the at least one disc 
management areas and determining whether or not the one of 
the at least one disc management areas is recorded; and 

(b) determining, based on a result of the step (a) , 
25 whether ornot thewrite-onceread-manyinf ormationrecording 

medium is changed from a write-once read-many state to a 
non-write-once read-many state. 

In one embodiment of this invention, the step (a) 
30 comprises determining whether or not the one of the at least 
one disc management areas is recorded, depending on an 
amplitude of a read signal Indicating a result of the reading 
of the data. 



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In one embodiment of this invention, the step (a) 
comprises determining whether or not the one of the at least 
one disc management areas is recorded, depending on whether 
5 or not the data is correctly read out. 

In one embodiment of this invention, the step (a) 
comprises reading data from one of the at least one disc 
management areas, and based on a result of the reading of 
10 the data, determining whether or not last disc management 
Information and last disc definition structure are recorded 
in the at least one disc management area; 

the last disc management information is a latest disc 
management Information provided in the at least one disc 
15 management area; 

the last disc definition structure is a disc 
definition structure containing positional information 
about the last disc management information; and 

the latest disc management information is disc 
20 management information recorded in a recorded disc management 
working area neighboring a border between the recorded disc 
management working area and an unrecorded disc management 
working area. 

25 In one embodiment of this invention, the step (a) 

comprises determining whether or not the one of the at least 
one disc management areas is recorded, based on whether or 
not the last disc management information or the last disc 
definition structure is correctly read out; 

30 the last disc management information is latest disc 

management information provided in the at least one disc 
management area; 

the last disc definition structure is a disc 



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definition structure containing positional Information 
about the last disc management inf orination ; and 

the latest disc management information is disc 
management Information recorded in a recorded disc management 
5 working area neighboring a border between the recorded disc 
management working area and an unrecorded disc management 
working area. 

In one embodiment of this invention, the step (a) 
10 comprises reading data from each of the at least one disc 
management area and determining whether or not each of the 
at least one disc management area is recorded; and 

the step (b) comprises determining that the 
write-once read-many information recording medium is changed 
15 from a write-once read-many state to a non-write-once 
read-many state when it is determined that at least one of 
the at least one disc management areas is recorded, and 
determines that the write-once read-many information 
recording medium is not changed from a write-once read-many 
20 state to a non-write-once read-many state when all of the 
at least one disc management areas are unrecorded. 

In one embodiment of this invention, the disc 
management area is a defect management area for recording 
25 management information about a defect area. 

According to another aspect of the present invention , 
there is provided a finalization determination apparatus 
for determining whether or not a write-once read-many 
30 information recording medium is already finalized, wherein: 

at least one disc management working area is allocated 
on the write -once read-many information recording medium; 

the finalization determination apparatus 



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comprising: 

(a) a section for determining whether or not a 
f inalization identifying flag is recorded on the write-onoe 
read-many information recording medium, the finalization 

5 identifying flag indicating prohibition of additional 
recording data into the at least one disc management working 
area ; and 

(b) a section for determining, based on a result of 
determination by the section (a), whether or not the 
write-once read-many Information recording medium Is changed 
from a write-once read-many state to a non-write-once 
read-many state. 

In one embodiment of this Invention, In the at least 
one disc management working area, disc management information, 
which is management information about the write -once 
read-many information recordingmedium, and a disc definition 
structure containing positional information about the disc 
management information, are provided; and 

the section (a) comprises a section for determining 
whether or not the finalization identifying flag is recorded 
in at least one of the disc definition structure and the 
disc management information. 

According to another aspect of the present invention, 
there is provided a finalization determination apparatus 
for determining whether or not a write-once read-many 
information recordingmedium is already finalized, wherein: 
at least one disc management working area and at least 
one disc management area are allocated on the write -once 
read-many Information recording medium; 

in the at least one disc management working area, 
disc management information , which is management information 



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about thewrite-onoe read-many Information recordingmedlum, 
and a disc definition structure containing positional 
information about the disc management information, are 
recorded; and 

5 the finalization determination apparatus 

comprising: 

(a) a section for reading data from one of the at 
least one disc management areas and determining whether or 
not the one of the at least one disc management areas is 
recorded ; and 

(b) a section for determining, based on a result of 
determination by the section (a), whether or not the 
write- once read-many information recordingmedlum is changed 
from a write -once read-many state to a non-write-once 
read-many state. 

In one embodiment of this invention, the section (a) 
comprises a section for determining whether or not the one 
of the at least one disc management areas is recorded, 
depending on an amplitude of a read signal indicating a result 
of the reading of the data. 

In one embodiment of this invention, the section (a) 
comprises a section for determining whether or not the one 
of the at least one disc management areas is recorded, 
depending on whether or not the data is correctly read out. 

In one embodiment of this invention, the section (a) 
comprises a section for reading data from one of the at least 
one disc management areas , and based on a result of the reading 
of the data, determining whether or not last disc management 
information and last disc definition structure are recorded 
in the at least one disc management area; 



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the last disc management information is a latest disc 
management information provided In the at least one disc 
management area; 

the last disc definition structure is a disc 
5 definition structure containing positional Information 
about the last disc management information; and 

the latest disc management information is disc 
management information recorded in a recorded disc management 
working area neighboring a border between the recorded disc 
management working area and an unrecorded disc management 
working area. 

In one embodiment of this invention, the section (a) 
comprises a section for determining whether or not the one 
of the at least one disc management areas is recorded, based 
on whether or not the last disc management information or 
the last disc definition structure is correctly read out; 

the last disc management information is latest disc 
management information provided in the at least one disc 
management area; 

the last disc definition structure is a disc 
definition structure containing positional infoxmatlon 
about the last disc management information; and 

the latest disc management Information is disc 
management Information recorded in a recorded disc management 
working area neighboring a border between the recorded disc 
management working area and an unrecorded disc management 
working area. 

In one embodiment of this invention, the section (a) 
comprises a section for reading data from each of the at 
least one disc management area and determining whether or 
not each of the at least one disc management area is recorded; 



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and 

the section (b) comprises a section for determining 
that the write-once read-many information recording medium 
is changed from a write-once read-many state to a 

5 non-write-once read-many state when it is determined that 
at least one of the at least one disc management areas is 
recorded, and determines that the write -once read-many 
information recording medium is not changed from a write-once 
read-many state to a non-write-once read-many state when 

0 all of the at least one disc management areas are unrecorded. 

In one embodiment of this invention, the disc 
management area is a defect management area for recording 
management information about a defect area. 

5 

According to another aspect of the present invention, 
there is provided a finalization method for finalizing a 
write-once read-many information recording medium, wherein : 
at least one disc management working area is allocated 
20 on the write-once read-many information recording medium; 
and 

the finalization method comprising the steps of: 
(a) recording a finalization identifying flag onto 
the write-once read-many information recording medium, the 
finalization identifying flag indicating prohibition of 
additional recording data into the at least one disc 
management working area. 

In one embodiment of this invention, in the at least 
one disc management working area, disc management information, 
which is management information about the write- once 
read-many information recording medium, and a disc definition 
structure containing positional information about the disc 



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management Information, are provided; and 

the step (a) comprises recording the finalization 
identifying flag into at least one of the disc definition 
structure and the disc management Information. 

5 

According to another aspect of the present invention , 
there is provided a finalization method for finalizing a 
write-once read-many information recording medium, wherein : 
at least one disc management working area and at least 
10 one disc management area are allocated on the write-once 
read-many information recording medium; 

in the at least one disc management working area, 
disc management information, which is management information 
about the write-once read-many Information recording medium , 
15 and a disc definition structure containing positional 
information about the. disc management Information, are 
recorded; and 

the finalization method comprising the steps of: 

(a) recording last disc management information into 
one of the at least one disc management areas; and 

(b) recording, based on the last disc management 
information, a last disc definition structure into the one 
of the at least one disc management areas; 

the last disc management information Is a latest disc 
management information provided in the at least one disc 
management area ; 

the last disc definition structure is a disc 
definition structure containing positional Information 
about the last disc management information; 

the latest disc management information is disc 
management information recorded in a recorded disc management 
working area neighboring a border between the recorded disc 
management working area and an unrecorded disc management 



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working area. 

In one embodiment of this invention, the f Inalization 
method further comprises changing latest disc definition 
5 structure to the last disc definition structure by changing 
positional information indicating a position of the recorded 
disc management working area neighboring the border to 
.positional Infoarmation indicating a position of one of the 
at least one disc management areas, 

wherein the latest disc definition structure 
includes positional information about the latest disc 
management information. 

In one embodiment of this invention, the f inalization 
method further comprises repeating the step (a) and the 
step (b) for each of the at least one disc management area 
to record the last disc management information and the last 
disc definition structure into all of the at least one disc 
management area. 

According to another aspect of the present invention , 
there is provided a finalization apparatus for finalizing 
a write-once read-many information recording medium, 
wherein : 

at least one disc management working area is allocated 
on the write-once read-many information recording meditun; 
and 

the finalization apparatus comprising: 
(a) a section for recording a finalization 
identifying flag onto the write-once read-many information 
recording medium, the finalization identifying flag 
indicating prohibition of additional recording data into 
the at least one disc management working area. 



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In one embodiment of this Invention, In the at least 
one disc management working area, disc management Information ^ 
which Is management Information about the write-once 
5 read-many Information recordlngmedlum, and a disc definition 
structure containing positional information about the disc 
management information, are provided; and 

the section (a) comprises a section for recording 
the finalizatlon identifying flag into at least one of the 
10 disc definition structure and the disc management 
information. 

According to another aspect of the present invention , 
there is provided a finalizatlon apparatus for finalizing 
15 a write-once read-many Infomation recording medium, 
wherein : 

at least one disc management working area and at least 
one disc management area are allocated on the write-once 
read-many information recording medium; 
20 in the at least one disc management working area, 

disc management information , which is management information 
about the write-once read-many Information recording medium, 
and a disc definition structure containing positional 
information about the disc management information, are 
25 recorded; and 

the finalizatlon apparatus comprising: 
(a} a section for recording last disc management 
Information into one of the at least one disc management 
areas ; and 

30 (b) a section for recording, based on the last disc 

management information, a last disc definition structure 
into the one of the at least one disc management areas; 

the last disc management information Is a latest disc 



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management information provided in the at least one disc 
management area; 

the last disc definition structure is a disc 
definition structure containing positional information 
5 about the last disc management information; 

the latest disc management information is disc 
management information recorded in a recorded disc management 
working area neighboring a border between the recorded disc 
management working area and an unrecorded disc management 
10 working area. 

In one embodiment of this invention , the f inalization 
apparatus further comprises a section for changing latest 
disc definition structure to the last disc definition 
structure by changing positional information indicating a 
position of the recorded disc management working area 
neighboring the border to positional information indicating 
a position of one of the at least one disc management areas, 
wherein the latest disc definition structure 
includes positional information about the latest disc 
management information. 

In one embodiment of this invention , the f inalization 
method further comprises a section for repeatedly performing 
25 recording last disc management information into one of the 
at least one disc management areas, and recording, based 
on the last disc management information, a last disc 
definition structure into the one of the at least one disc 
management areas , for each of the at least one disc management 
30 area to record the last disc management information and the 
last disc definition structure into all of the at least one 
disc management area. 



15 



20 



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- 96 - 

According to another aspect of the present invention, 
there is provided a write -once read-many information 
recording medium, wherein; 

at least one disc management working area is 
5 sequentially allocated in a predetermined direction, 

the at least one disc management working area contains 
a plurality of blocks, each block being a unit for 
recording/reproducing data; 

in each of the plurality of blocks, partial disc 
10 management information contained in disc management 
information, which is management information about the 
write-once read-many information recording medium, and a 
disc definition structure containing positional information 
about the partial disc management information, are provided; 
and 

the disc definition structure is provided at a 
predetermined position in each of the plurality of blocks . 

In one embodiment of this invention , the partial disc 
management information and the disc definition structure 
are provided in each of a plurality of blocks contained in 
a recorded disc management area neighboring a border between 
the recorded disc management working area and an unrecorded 
disc management working area. 

In one embodiment of this invention, the write-once 
read-many information recording medium contains a data area 

for recording data and a spare area, the spare area being 
a replacement area for the data area; 

the disc management information contains a 
replacement list containing correspondence relationship 
Information indicating a correspondence relationship 
between a replacement source area contained in the data area 



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and a replacement destination area contained in the spare 
area ; and 

In each of the plurality of blocks, a partial 
replacement list contained in the replacement list, and a 
5 disc definition structure containing positional information 
about the partial replacement list, are provided. 

In one embodiment of this invention, the 
predetermined direction is a direction from an inner 
0 periphery to an outer periphery of the write-once read-many 
information recording medium. 

In one embodiment of this invention, the 
predetermined direction is a direction from an outer 
periphery to an inner periphery of the write-once read-many 
information recording medium. 

According to another aspect of the present invention , 
there is provided an information recording method for 
recording information onto a write- once read-many 
information recording medium, wherein: 

at least one disc management working area is 
sequentially allocated in a predetermined direction on the 
write-once read-many information recording medium; and 

the information recording method comprising the 
steps of: 

( a ) selecting an unrecorded disc management working 
area neighboring a border between a recorded disc management 
working area and the unrecorded disc management working area; 

(b) recording partial disc management information 
contained in disc management information, which is management 
information about the write-once read-many information 
recording medium, into each of a plurality of blocks contained 



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±n the unrecorded disc management working area neighboring 
the border; and 

(c) recording a disc definition structure 
containing positional information about the partial disc 
5 management information into each of a plurality of blocks 
contained in the unrecorded disc management working area 
neighboring the border; 

each of the plurality of blocks is a unit for 
recording/reproducing data; and 

the disc definition structure is provided at a 
predetermined position in each of the plurality of blocks . 

In one embodiment of this invention, the write-once 
read-many information recording medium contains a data area 
for recording data and a spare area, the spare area being 
a replacement area for the data area; 

the disc management Information contains a 
replacement list containing correspondence relationship 
information indicating a correspondence relationship 
between a replacement source area contained in the data area 
and a replacement destination area contained in the spare 
area; 

in each of the plurality of blocks, a partial 
replacement list contained In the replacement list, and a 
disc definition structure containing positional Information 
about the partial replacement list, are provided. 

In one embodiment of this Invention, the step (b) 
further comprises determining whether or not the recording 
of the partial disc management information has been normally 
performed; 

the step (c) further comprises determining whether 
or not the recording of the disc definition structure has 



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been normally performed; and 

the Information recording method further comprises 
the step of: 

(d) repeatedly performing the step (b) until the 
5 recording of the partial disc management information is 
normally performed, and repeatedly performing the step (c) 
until the recording of the disc definition structure is 
normally performed. 

10 According to another aspect of the present invention , 

there is provided an information reproduction method for 
reproducing information from a write-once read-many 
information recording medium, wherein: 

at least one disc management working area is 

15 sequentially allocated in a predetermined direction on the 
write-once read-many information recording medium* 

the at least one disc management working area contains 
a plurality of blocks , each of the plurality of blocks being 
a unit for recording/reproducing data; 

20 in each of the plurality of blocks, partial disc 

management information contained in disc management 
information, which is management information about the 
write-once read-many information recording medium, and a 
disc definition structure containing positional information 

25 about the partial disc management information, are provided; 

the disc definition structure is provided at a 
predetermined position in each of the plurality of blocks; 
and 

the information reproduction method comprising the 
30 steps of: 

(a) searching for a position of a border between a 
recorded disc management working area and an unrecorded disc 
management working area to obtain border positional 



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Information Indicating the position of the border; 

(b) reproducing the disc definition structure from 
the recorded disc management working area neighboring the 
border based on the border positional information; 
5 (c) obtaining positional information about the 

partial disc management information based on the disc 
definition structure; and 

(d) reproducing the partial disc management 
information from each of a plurality of blocks contained 

10 in the recorded disc management working area neighboring 
the border based on the positional information about the 
partial disc management information. 

In one embodiment of this invention, the write-once 
read-many Information recording medium contains a data area 
for recording data and a spare area, the spare area being 
a replacement area for the data area; 

the disc management Information contains a 
replacement list containing correspondence relationship 
information Indicating a correspondence relationship 
between a replacement source area contained in the data area 
and a replacement destination area contained in the spare 
area; and 

in each of the plurality of blocks, a partial 
replacement list contained in the replacement list, and a 
disc definition structure containing positional information 
about the partial replacement list, are provided. 

In one embodiment of this invention, the step (o) 
30 further comprises the step of: 

(e) determining whether or not the recorded disc 
management working area is an area in which the recording 
is normally completed, based on the positional information 



20 



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about the partial disc management Information contained in 
the disc definition structure; and 

when it is determined that the recorded disc 
management working area is an area in which the recording 
5 is not normally completed, a position of a border between 
the recorded disc management working area neighboring the 
border and a recorded disc management working area 
neighboring the recorded disc management working area 
neighboring the border, is searched for based on the 
10 positional information about the partial disc management 
information. 

In one embodiment of this invention, the step (e) 
comprises determining whether or not the recorded disc 
management working area is an area in which the recording 
is normally completed, by comparing the positional 
information about the partial disc management information 
with positional information about a border between the 
recorded disc management working area and an unrecorded disc 
management working area. 

According to another aspect of the present invention , 
there is provided an information recording apparatus for 
recording information onto a write-once read-many 
information recording medium, wherein: 

at least one disc management working area is 
sequentially allocated in a predetermined direction on the 
write-once read-many information recording medium; and 
the information recording apparatus comprising: 
(a) a section for selecting an unrecorded disc 
management working area neighboring a border between a 
recorded disc management working area and the unrecorded 
disc management working area; 



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(b) a section for recording partial disc management 
Information contained In disc management Information, which 
Is management Information about the write-once read-many 
information recording medium, into each of a plurality of 

5 blocks contained in the unrecorded disc management working 
area neighboring the border; and 

(c) a section for recording a disc definition 
structure containing positional information about the 
partial disc management information into each of a plurality 
of blocks contained in the unrecorded disc management working 
area neighboring the border; 

each of the plurality of blocks is a unit for 
recording/ reproducing data; and 

the disc definition structure is provided at a 
predetermined position in each of the plurality of blocks . 

In one embodiment of this invention, the write-once 
read-many information recording medium contains a data area 
for recording data and a spare area, the spare area being 
a replacement area for the data area; 

the disc management information contains a 
replacement list containing correspondence relationship 
infozmation indicating a correspondence relationship 
between a replacement source area contained In the data area 
and a replacement destination area contained in the spare 
area; 

in each of the plurality of blocks, a partial 
replacement list contained in the replacement list, and a 
disc definition structure containing positional information 
about the partial replacement list, are provided. 



In one embodiment of this invention, the section (b) 
further comprises a section for determining whether or not 



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the recording of the partial disc management Information 
has been noimally performed; 

the section (c) further comprises a section for 
determining whether or not the recording of the disc 
5 definition structure has been normally performed; and 

the Information recording apparatus further 
comprises : 

(d) a section for repeatedly performing recording 
of the partial disc management information until the 
10 recording of the partial disc management information is 
normally performed, and repeatedly performing recording of 
the disc definition structure until the recording of the 
disc definition structure is normally performed. 

15 According to another aspect of the present invention , 

there is provided an Information reproduction apparatus for 
reproducing information from a write-once read-many 
information recording mediiam, wherein: 

at least one disc management working area is 

20 sequentially allocated in a predetermined direction on the 
write -once read-many information recording medium; 

the at least one disc management working area contains 
a plurality of blocks , each of the plurality of blocks being 
a unit for recording/reproducing data; 

25 in each of the plurality of blocks, partial disc 

management information contained in disc management 
information, which is management information about the 
write-once read-many information recording medium, and a 
disc definition structure containing positional information 

30 about the partial disc management information, are provided; 

the disc definition structure is provided at a 
predetermined position in each of the plurality of blocks; 
and 



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the Information reproduction apparatus comprising; 

(a) a section for searching for a position of a border 
between a recorded disc management working area and an 
unrecorded disc management working area to obtain border 

5 positionalinf ormat ion indicating the position of the border; 

(b) a section for reproducing the disc definition 
structure from the recorded disc management working area 
neighboring the border based on the border positional 
information; 

(o) a section for obtaining positional information 
about the partial disc management Information based on the 
disc definition structure; and 

(d) a section for reproducing the partial disc 
management information from each of a plurality of blocks 
contained in the recorded disc management working area 
neighboring the border based on the positional information 
about the partial disc management information. 

In one embodiment of this invention, the write- once 
read-many information recording medium contains a data area 
for recording data and a spare area, the spare area being 
a replacement area for the data area; 

the disc management information contains a 
replacement list containing correspondence relationship 
information indicating a correspondence relationship 
between a replacement source area contained in the data area 
and a replacement destination area contained in the spare 
area ; and 

in each of the plurality of blocks, a partial 
replacement list contained in the replacement list, and a 
disc definition structure containing positional information 
about the partial replacement list, are provided. 



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In one embodiment of this invention, the section (o) 
further comprises: 

(e) a section for determining whether or not the 
recorded disc management working area is an area in which 
5 the recording is normally completed, based on the positional 
information about the partial disc management information 
contained in the disc definition structure; and 

when it is determined that the recorded disc 
management working area is an area in which the recording 
10 is not normally completed, a position of a border between 
the recorded disc management working area neighboring the 
border and a recorded disc management working area 
neighboring the recorded disc management working area 
neighboring the border, is searched for based on the 
15 positional information about the partial disc management 
information. 

In one embodiment of this invention, the section (e) 
comprises a section for determining whether or not the 
recorded disc management working area is an area in which 
the recording is normally completed, by comparing the 
positional information about the partial disc management 
information with positional information about a border 
between the recorded disc management working area and an 
unrecorded disc management working area. 

Although certain preferred embodiments have been 
described herein, it is not intended that such embodiments 
be construed as limitations on the scope of the invention 
30 except as set forth in the appended claims. Various other 
modifications and equivalents will be apparent to and can 
be readily made by those skilled in the art, after reading 
the description herein, without departing from the scope 



20 



25 



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and spirit of this invention. All patents, published patent 
applications and publications cited herein are incorporated 
by reference as if set forth fully herein. 

5 INDUSTRIAL APPLICABILITY 

In the write-once read-many information recording 
medium of the present invention, at least one defect 
management working area is sequentially allocated in a 
predetermined direction. The latest defect list and the 
latest DDS are provided in the predetermined direction in 
a recorded defect management working area neighboring a 
border between the recorded defect management working area 
and an unrecorded defect management working area, where the 
latest defect list precedes the latest DDS in the 
predetermined direction. Therefore, it is possible to 
easily find the latest DDS and the latest defect list. 

By finalization, the data structure of a write-once 
read-many optical disc after finalization is the same as 
the data structure of a rewritable optical disc . As a result , 
data recorded on a finalized write -once read-many optical 
disc can be reproduced by a rewritable optical disc 
recording/reproduction apparatus , resulting in a compatible 
optical disc for reproduction. 

A subsldianry disc definition structure (SDDS) is 
provided at a predetermined position in each of a plurality 
of blocks. Therefore, even when update of a defect management 
working area is Incomplete since the power is cut or the 
like, it is correctly determined that update has failed. 
Therefore, it is possible to easily find the beginning 
position of a defect management working area in which update 



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has failed. Therefore, it is possible to easily obtain a 
defect list in the latest normal defect management working 
area. 

5 According to the inf oinnation recording method of the 

present invention, even if a defect block is present in a 
defect management working area and therefore recording of 
a defect list and a DDS fails, recording of the defect list 
and the DDS can be repeatedly performed until recording of 
10 the defect list and the DDS is normally completed. Thus, 
a defect list and a DDS can be correctly recorded. As a result , 
the reliability of recording of a defect list and a DDS into 
a defect management working area can be improved. 



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- 108 - 
CLAIMS 

1. A v?rite-once read-many Information recording medium, 
wherein : 

5 at least one disc management working area is 

sequentially allocated in a predetennined direction; 

in the at least one disc management working area, 
disc management information , which is management information 
about the write-once read-many information recording medium, 
and disc definition structure containing positional 
information about the disc management information, are 
provided; 

latest disc management information and latest disc 
definition structure are provided, wherein the latest disc 
management information precedes the latest disc definition 
structure in the predetermined direction; 

the latest disc management information is disc 
management information provided in a recorded disc management 
working area neighboring a border between the recorded disc 
management working area and an unrecorded disc management 
working area; 

the latest disc definition structure is a disc 
definition structure containing positional information 
about the latest disc management information; and 

the latest disc definition structure is provided at 
a predetermined position in the recorded disc management 
working area neighboring the border, the predetermined 
position being capable of being calculated based on the border 
as a reference. 

2. A write-once read-many information recording medium 
according to claim 1, wherein: 

the disc management information has a variable size; 



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- 109 - 

and 

the disc definition structure has a fixed size. 

3. A write-once read-many information recording medium 
5 according to claim 1, wherein: 

the write-once read-many information recording 
medium contains a data area for recording data and a spare 
area, the spare area being a replacement area for the data 
area ; 

10 the disc management information contains a 

replacement list containing correspondence relationship 
information indicating a correspondence relationship 
between a replacement source area contained in the data area 
and a replacement destination area contained in the spare 

15 area; and 

the disc definition structure contains replacement 
list positional information which is positional information 
about the replacement list. 

20 4. A write-once read-many information recording medium 
according to claim 3, wherein: 

the predetermined direction is a direction from an 
inner periphery to an outer periphery of the write -once 
read-many information recording meditim; and 

25 the latest disc definition structure is provided at 

a predetermined position which is capable of being calculated 
based on an end of the recorded disc management working area 
neighboring the border as a reference. 

30 5. A write-once read-many Information recording medium 
according to claim 3, wherein: 

the predetermined direction is a direction from an 
outer periphery to an inner periphery of the write-once 



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- 110 - 

read-many Information recording medium; and 

the latest disc definition structure Is provided at 
a predetermined position which Is capable of being calculated 
based on a beginning of the recorded disc management working 
5 area neighboring the border as a reference. 

6. A write-once read-many Information recording medium 
according to claim 4, wherein: 

the disc management working area contains a plurality 
10 of blocks; 

each of the plurality of blocks is a unit for 
recording/reproducing data; and 

the disc management Information and the disc 
definition structure are provided in different blocks in 
the plurality of blocks. 

7. A write-once read-many information recording medium 
according to claim 4, wherein: 

the disc management working area contains one or more 

blocks ; 

each of the one or more blocks is a unit for 
recording/reproducing data; 

the disc management information and the disc 
definition structure shares at least one of the one or more 
blocks ; and 

the disc definition structure Is provided at a 
predetermined position in a predetermined block among blocks 
contained In the recorded disc management working area 
neighboring the border , the predetermined block being capable 
of being calculated based on the border as a reference. 

8. A write-once read-many Information recording medium 
according to claim 4, wherein: 



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- Ill - 

a finalization identifying flag is recorded in the 
write-once read-many information recording medium; and 

the finalization identifying flag indicates 
prohibition of additionally recording data into the at least 
5 one disc management working area. 

9. A write-once read-many information recording medium 
according to claim 8, wherein: 

at least one of the disc definition structure and 
the disc management information contains the finalization 
identifying flag. 

10. A write-once read-many information recording medium 
according to claim 4, wherein: 

the write-once read-many information recording 
medium contains at least one disc management area; 

in the at least one disc management area, the last 
disc management information and the last disc definition 
structure are provided; 

the last disc management information is the latest 
disc management information provided in the at least one 
disc management area; 

the last disc definition structure is a disc 
definition structure containing positional information 
about the last disc management information; and 

the last disc management information and the last 
disc definition structure are provided from a beginning of 
the at least one disc management area, wherein the last disc 
definition structure precedes the last disc management 
information in the direction from the inner periphery to 
the outer periphery of the write- once read-many information 
recording medium. 



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- 112 - 

11. A write-once read-many Information recording medium 
according to claim 5, wherein: 

the disc management working area contains a plurality 
of blocks; 

5 each of the plurality of blocks is a unit for 

recording/reproducing data; and 

the disc management information and the disc 
definition structure are provided in different blocks in 
the plurality of blocks. 

12. A write-once read-many information recording medium 
according to claim 5, wherein: 

the disc management working area contains one or more 

blocks ; 

each of the one or more blocks is a unit for 
recording/ reproducing data; 

the disc management information and the disc 
definition structure shares at least one of the one or more 
blocks ; and 

the disc definition structure is provided at a 
predetermined position in a predetermined block among blocks 
contained in the recorded disc management working area 
neighboring the border , the predetermined block being capable 
of being calculated based on the border as a reference. 

13. A write-once read-many information recording medium 
according to claim 5, wherein: 

a finalization identifying flag is recorded in the 
write-once read-many information recording medium; and 

the finalization identifying flag indicates 
prohibition of additionally recording data into the at least 
one disc management working area. 



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14. A write-once read-many information recording medium 
according to claim 13, wherein at least one of the disc 
definition structure and the disc management information 
contains the finalization identifying flag. 

5 

15. A write-once read-many information recording medium 
according to claim 5, wherein: 

the write-once read-many information recording 
medium contains at least one disc management area; 
10 in the at least one disc management area, the last 

disc management information and the last disc definition 
structure are provided; 

the last disc management information is the latest 
disc management information provided in the at least one 
15 disc management area; 

the last disc definition structure is a disc 
definition structure containing positional information 
about the last disc management information; and 

the last disc management information and the last 
20 disc definition structure are provided from a beginning of 
the at least one disc management area, wherein the last disc 
definition structure precedes the last disc management 
information in the direction from the inner periphery to 
the outer periphery of the write-once read-many information 
25 recording medium. 

16. An information recording method for recording 
information onto a write-once read-many information 
recording medium, wherein 

30 at least one disc management working area is 

sequentially provided in a predetermined direction on the 
write-once read-many information recording medium, 

the information recording method comprising the 



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- 114 - 

steps of; 

( a ) selecting an unrecorded disc management working 
area neighboring a border between a recorded disc management 
working area and the unrecorded disc management working area ; 
5 ( b ) recording disc management information , which is 

management information about the write-once read-many 
information recording medium, into the unrecorded disc 
management working area neighboring the border; and 

(c) recording a disc definition structure 
containing positional information about the disc management 
information recorded in the step (b) into the unrecorded 
disc management working area neighboring the border, 

wherein the disc management information and the disc 
definition structure are provided in the predetermined 
direction, the disc management information preceding the 
disc definition structure in the predetermined direction, 
and 

the disc definition structure is provided at a 
predetermined position in the unrecorded disc management 
working area neighboring the border, the predetermined 
position being capable of being calculated based on the border 
as a reference. 

17. An information recording method according to claim 16, 
wherein the disc management information has a variable size 
and the disc definition structure has a fixed size. 

18. An information recording method according to claim 16, 
wherein : 

the write-once read-many information recording 
medium contains a data area for recording data and a spare 
area, the spare area being a replacement area for the data 
area ; 



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- 115 - 

the disc management information contains a 
replacement list containing correspondence relationship 
Information indicating a correspondence relationship 
between a replacement source area contained in the data area 
5 and a replacement destination area contained in the spare 
area ; and 

the disc definition structure contains replacement 
list positional information which is positional information 
about the replacement list. 

19. An information recording method according to claim 16, 
wherein : 

the predetermined direction is a direction from an 
inner periphery to an outer periphery of the write-once 
read-many information recording medium; and 

the disc definition structure containing the 
positional information about the disc management Information 
recorded in the step (b) is provided at a predetermined 
position which is capable of being calculated based on an 
end of the unrecorded disc management working area 
neighboring the border as a reference. 

20. An information recording method according to claim 16, 
wherein : 

the predetermined direction is a direction from an 
outer periphery to an inner periphery of the write- once 
read-many information recording medium; and 

the disc definition structure containing the 
positional information about the disc management information 
recorded in the step (b) is provided at a predetermined 
position which is capable of being calculated based on a 
beginning of the unrecorded disc management working area 
neighboring the border as a reference. 



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21. An Information recording method according to claim 19, 
wherein : 

the step (b) further comprises determining whether 
5 or not the recording of the disc management information has 
been normally performed; 

the step (c) further comprise determining whether 
or not the recording of the disc definition structure has 
been normally performed; and 
10 the information recording method further comprises 

the step of : 

(d) repeatedly performing the step (b) until the 
recording of the disc management information is normally 
performed, and repeatedly performing the step (c) until the 
15 recording of the disc definition structure is normally 
performed. 

22. An information recording method according to claim 20, 
wherein : 

20 the step (b) further comprises determining whether 

or not the recording of the disc management information has 
been normally perfoinned; 

the step (o) further comprises determining whether 
or not the recording of the disc definition structure has 
25 been normally performed; and 

the information recording method further comprises 
the step of: 

(d) repeatedly performing the step (b) until the 
recording of the disc management information is normally 
30 performed, and repeatedly performing the step (c) until the 
recording of the disc definition structure is normally 
performed. 



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23. An Information reproduction method for reproducing 
information from a write-once read-many information 
recording medium, wherein: 

at least one disc management working area is 
sequentially allocated in a predetermined direction on the 
write-once read-many information recording medium; 

in the at least one disc management working area, 
disc management information, which is management information 
about the write-once read-many information recording medixim, 
and disc definition structure containing positional 
information about the disc management information, are 
provided; 

latest disc management information and latest disc 
definition structure are provided in the predetermined 
direction, the latest disc management information preceding 
the latest disc definition structure in the predetermined 
direction; 

the latest disc management information is disc 
management information provided in a recorded disc management 
working area neighboring a border between the recorded disc 
management working area and an unrecorded disc management 
working area; 

the latest disc definition structure is a disc 
definition structure containing positional information 
about the latest disc management information; 

the latest disc definition structure is provided at 
a predetermined position in the recorded disc management 
working area neighboring the border, the predetermined 
position being capable of being calculated based on the border 
as a reference, 

the information reproduction method comprising the 
steps of : 

(a) searching for a position of the border to obtain 



wo 2004/059648 PCT/JP2003/016057 



border positional Information indicating the position of 
the border; 

(b) reproducing the latest disc definition 
structure based on the border positional information; 
5 (c) obtaining positional information about the 

latest disc management information based on the latest disc 
definition structure; and 

(d) reproducing the disc management information 
based on the positional information about the latest disc 
management inforxnation. 

24. An information reproduction method according to claim 23, 
wherein the disc management information has a variable size 
and the disc definition structure has a fixed size. 

25. An information reproduction method according to claim 23, 
wherein : 

the write-once read-many information recording 
medium contains a data area for recording data and a spare 
area, the spare area being a replacement area for the data 
area; 

the disc management information contains a 
replacement list containing correspondence relationship 
information indicating a correspondence relationship 
between a replacement source area contained in the data area 
and a replacement destination area contained in the spare 
area; and 

the disc definition structure contains replacement 
list positional information which is positional information 
about the replacement list. 

26. An information reproduction method according to claim 25, 
wherein : 



wo 2004/059648 PCT/JP2003/016057 



the predetermined direction is a direction from an 
inner periphery to an outer periphery of the write-once 
read-many Information recording medium; and 

the latest disc definition structure la provided at 
5 a predetermined position which is capable of being calculated 
based on an end of the recorded disc management working area 
neighboring the border as a reference. 

27. An information reproduction method according to claim 25 , 
wherein ; 

the predetermined direction is a direction from an 
outer periphery to an inner periphery of the write-once 
read-many infonnation recording medium; and 

the latest disc definition structure is provided at 
a predetermined position which is capable of being calculated 
based on a beginning of the recorded disc management working 
area neighboring the border as a reference. 

28. An information recording apparatus for recording 
20 infonnatlon onto a write-once read-many Information 

recording medium, wherein 

at least one disc management working area is 
sequentially provided in a predetermined direction on the 
write-once read-many Information recording medium, 

25 the information recording apparatus comprising: 

(a.) a section for selecting an unrecorded disc 
management working area neighboring a border between a 
recorded disc management working area and the unrecorded 
disc management working area; 

30 (b) a section for recording disc management 

information, which is management information about the 
write-once read-many information recording medium, into the 
unrecorded disc management working area neighboring the 



10 



15 



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- 120 - 

border; 

(c) a section for recording a disc definition 
structure containing positional information about the disc 
management information recorded in the step (b) into the 
5 unrecorded disc management working area neighboring the 
border, 

wherein the disc management information and the disc 
definition structure eire provided in the predetermined 
direction, the disc management information preceding the 
disc definition structure in the predetermined direction, 
and 

the disc definition structure is provided at a 
predetermined position in the unrecorded disc management 
working area neighboring the border, the predetermined 
position being capable of being calculated based on the border 
as a reference. 

29 . An information recording apparatus according to claim 28 , 
wherein the disc management information has a variable size 
and the disc definition structure has a fixed size. 

30. An information recording apparatus according to claim 28 , 
wherein : 

the write-once read-many information recording 
medium contains a data area for recording data and a spare 
area, the spare area being a replacement area for the data 
area; 

the disc management information contains a 
replacement list containing correspondencie relationship 
information indicating a correspondence relationship 
between a replacement source area contained in the data area 
and a replacement destination area contained in the spare 
area ; and 



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- 121 - 

the disc definition structure contains replacement 
list positional information which is positional information 
about the replacement list. 

5 31. An Information recording apparatus according to claim 28, 
wherein ; 

the predetermined direction is a direction from an 
inner periphery to an outer periphery of the write-once 
read-many information recording medium; and 

the disc definition structure containing the 
positional information about the disc management information 
recorded by the section (b) is provided at a predetermined 
position which is capable of being calculated based on an 
end of the unrecorded disc management working area 
neighboring the border as a reference. 

32. An information recording apparatus according to claim 28, 
wherein : 

the predetermined direction is a direction from an 
outer periphery to an inner periphery of the write -once 
read-many Information recording medium; and 

the disc definition structure containing the 
positional information about the disc management Information 
recorded by the section (b) isf provided at a predetermined 
position which is capable of being calculated based on a 
beginning of the unrecorded disc management working area 
neighboring the border as a reference. 

33. An information recording apparatus according to claim 31, 

wherein : 

the section (b) further comprises a section for 
determining whether or not the recording of the disc 
management information has been normally performed; 



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the section (c) further comprise a section for 
determining whether or not the recording of the disc 
definition structure has been normally performed; and 

the information recording apparatus further 

5 comprises : 

(d) a section for repeatedly performing recording 
of the disc management information until the recording of 
the disc management information is normally performed, and 
repeatedly performing recording of the disc definition 
10 structure until the recording of the disc definition 
structure is normally performed. 

34. An information recording apparatus according to claim 32, 
wherein : 

the section (b) further comprises a section for 
determining whether or not the recording of the disc 
management information has been normally performed; 

the section (c) further comprises a section for 
determining whether or not the recording of the disc 
definition structure has been normally performed; and 

the information recording apparatus further 
comprises : 

(d) a section for repeatedly performing recording 
of the disc management information until the recording of 
the disc management information is normally performed, and 
repeatedly performing recording of the disc definition 
structure until the recording of the disc definition 
structure is normally performed. 

30 35. An information reproduction apparatus for reproducing 
information from a write-once read-many information 
recording medium, wherein: 

at least one disc management working area is 



20 



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- 123 - 

sequentially allocated in a predetermined direction on the 
write-once read-many information recording medium; 

in the at least one disc management working area, 
disc management information , which is management information 
5 about the write-once read-many informationrecordingmedium, 
and disc definition structure containing positional 
information about the disc management information, are 
provided; 

latest disc management information and latest disc 
definition structure are provided in the predetermined 
direction, the latest disc management information preceding 
the latest disc definition structure in the predetermined 
direction; 

the latest disc management information is disc 
management information provided in a recorded disc management 
working area neighboring a border between the recorded disc 
management working area and an unrecorded disc management 
working area; 

the latest disc definition structure is a disc 
definition structure containing positional information 
about the latest disc management information; 

the latest disc definition structure is provided at 
a predetermined position in the recorded disc management 
working area neighboring the border, the predetermined 
position being capable of being calculated based on the border 
as a reference, 

the information reproduction apparatus comprising: 

(a) a section for searching for a position of the 
border to obtain border positional information indicating 
the position of the border; 

(b) a section for reproducing the latest disc 
definition structure based on the border positional 
information ; 



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(c) a section for obtaining positional information 
about the latest disc management information based on the 
latest disc definition structure; and 

(d) a section for reproducing the disc management 
5 information based oh the positional information about the 

latest disc management information. 

36. An information reproduction apparatus according to 
claim 35, wherein the disc management information has a 

10 variable size and the disc definition structure has a fixed 
size. 

37. An information reproduction apparatus according to 
claim 35, wherein: 

the write-once read-many information recording 
medium contains a data area for recording data and a spare 
area, the spare area being a replacement area for the data 
area; 

the disc management information contains a 
replacement list containing correspondence relationship 
information indicating a correspondence relationship 
between a replacement source area contained in the data area 
and a replacement destination area contained in the spare 
area ; and 

the disc definition structure contains replacement 
list positional information which is positional information 
about the replacement list. 

38. An information reproduction apparatus according to 
30 claim 37, wherein: 

the predetermined direction is a direction from an 
inner periphery to an outer periphery of the write-once 
read-many information recording medium; and 



20 



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the latest disc definition structure is provided at 
a predetermined position which is capable of being calculated 
based on an end of the recorded disc management working area 
neighboring the border as a reference. 

5 

39. An information reproduction apparatus according to 
claim 37, wherein: 

the predetermined direction is a direction from an 
outer periphery to an inner periphery of the write-once 
10 read-many information recording medium; and 

the latest disc definition structure is provided at 
a predetermined position which is capable of being calculated 
based on a beginning of the recorded disc management working 
area neighboring the border as a reference. 



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2/24 



FIG. 2 

i 

Lead-in 
area 4 



Second defect management area 



1 — 

Temporary 
management 
working area 
20 



Data 
area 5 



Lead-out 
area 6 



First defect management area 



Defect management working area 11 



Defect management working area 12 



Defect management working area SN 



Spare area 



V17 



User data area 



Spare area 



Third defect management area 



Fourth defect management area 



Disc definition structure 



Defect list 



J 



15 



Defect list 



Xi Disc definition structure 



15 



^16 



-yi7 

Vl3 



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3/24 



FIG. 3 







Defect list beginning 
positional information 


30 


Disc definition 
structure 




Other information 


31 










Defect list 


15 


Defect list header 
(The number of 
defect entries, etc.) 


32 






Defect entry #1 


33 










\ 




33 






Defect entry #M 



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PCT/JP2003/016057 



FIG. 4 



4/24 



I/O Bus 



'170 



Optical disc 
recording/reproduction appar atus 



'110 



Command processing section 



'120 



Recordirvg control section 



'130 



Reproduction control section 



Defect management 
information storage buffer 



Data buffer 



Defect management X_-^40 
in formation processing section 



' 160 



Defect management 
information reading 
section 



Defect management 
information 
writing section 



161 



162 



Defect management 
information 
updating section 



Defect management 
working information 
reading section 



Defect management 
information 
control memory 



163 



150 



Defect management 
working information 
writing section 



'100 



164 



165 



166 



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FIG. 5 



c 



Obtain latest defect 
management information 



3 



Search for recording 
end position 



/602 



Read DDS (obtain DFL 
beginning positional information) 



/603 



Read DFL 



' 40 



Recording end position 



lion ^ 



-'140 



I Defect management 
\ information storage buffer 



Defect list 
beginning position 



/140 



/ Defect management / 
\information storage buffer \ 



C 



End 



J 



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FIG. 6 



6/24 




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7/24 



FIG. 7 



Search for recording end position 



'801 



First amplitude examination 



/802 



Second amplitude examination 



803 



Obtain recording end position 



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FIG. 8 



8/24 



#1 



Temporary defect 
management area 20 



Variable i 
\- length >^ 



DMWA 


DMWA 


DMWA 




#2 


#3 


#4 


/ 



DMWA 
#N 



Ca) 



Recorded 



Unrecorded 



Outer 
periphery 





DMWA 


DMWA 


DMWA 


DMWA 




DMWA 


|;v#r 


#2 


#3 


#4 " 


// 


#N 



Recorded 



Cb) 



DMWA DMWA 
#3 #4 



DMWA 
#N 



(c) 



Recorded 





DMWA 
#1 


DMWA 

#2. ■ 


DMWA 
#3 



1 DMWA 




DMWA 


1 #4 


/ 





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9/24 



FIG. 9 



c 



Add DMWA 



3 



/901 



Select unrecorded defect management 
working area neighboring border 



902 



Record DFL and DDS 



' 40 



Recording end position 



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FIG. 10 



Add DMWA 







< 1 

^1101 


Update DFL positional information to the 
beginning position of unrecorded area 






^ y 1102 



Record DFL 




Yes 



^11 04 

Record DDS 




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FIG. 11 



jVl DMWA 
#1 



Temporary defect 
. management area 20 



k ?block^ 



DMWA 
#2 



DMWA 




#3 





DMWA 
#N 



Defect block 

Recorded 



Unrecorded 







(a) 


DMWA 
#1 












DFL#1 

(Failed 
recording) 


DFL#1 

(Successful 
recording) 


DDS 



DMWA 
#2 



DMWA 
#3 



Outer 
periphery 



DMWA 
#N 



(b) 



Recorded 













DFL#1 

(Failed 
recording) 


DFL#1 

(Successful 
recording) 


DDS 
#1 


DFL#2 

(Successftil 
recording) 


DDS 
#2 



1 DMWA 




DMWA 




#3 


/ 







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FIG. 12 



Lead-in 
area 4 



Temporary 

defect 
management 
area 20 

_i 



Data 
area 5 



First defect management area 



Second defect management area 



Defect mafiagement working area tH 



11 



Defect management working area #2 



Defect management working area #1 



Spare area 



t/21 
21 
17 



User data area 



Spare area 



Lead-out Third defect management area 



Fourth defect management area 



Disc definition structure 



Defect list 



Disc definition structure 



Defect list 



.14 
,15 

.14 
.15 



16 



y 



17 



y 



12 



y 



13 



1 



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FIG. 13 



c 



Finalization 



3 



1001 



1 — 


4 defect management areas 






^1002 




Change defect list 
positional information 






^1003 




Record DFL into 
defect management area 






^1004 




Record DDS into 
defect management area 








^1005 




1 4 defect management areas 





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FIG. 14 Rewritable read-many 

optical disc optical disc 

(after finalization) 



Leac 
ares 




















mmwM 


y///mhW/A 


















W/.VMhT-'W/. 


Hin 
4 




/ 






f Dm A 

^ (Unrecorded) 


Da 
arec 


ta 
> 5 






Spare area 






Spare area 


Defect block 


4 










Recorded 
area 


1 


1 










— 

\ Spare area 




Spare area 












Lead-out 
area 6 

1 






















mmKKm 













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FIG. 15 



[ start I 







Record finalization identifying flag 







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FIG. 16 

[ start ] 




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FIG. 17 



start 







Read data ' 



-2402 

Has a flag \ No 
^been recorded? 



Finalization is 
completed 



Finalization is 
not completed 



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FIG. 18 





Subsidiary defect list #1 








1 block 


J- 18 




Defect 
management 


] 


\ 


Subsidiary disc 
definition structure #1 


^ 19 


Defect list 


working area 


J- 21 




y 






\ 










\ 




Subsidiary defect list #M 




1 block' 


\ 


Subsidiary disc 
definition structure #M 


jr~ 19 



300 



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FIG. 19 



Subsidiary disc 
definition structure 



19 



Subsidiary defect list #1 
beginning positional information 



Other information 



34 



Subsidiary defect list #M 
beginning positional information 



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c 



FIG. 20 

Obtain latest defect 
management information 



Search for recording 
end position 



' 1902 



Read latest SDDS 
(obtain latest SDFL beginning 
positional information) 



Recording end position 



Defect management 7 
^information storage bufferl 

_42 

[ SDFL beginning position 



iition I 




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FIG. 21 



c 



Add DMWA 



3 



"2001 



Divide DFL into SDFLs 



/2002 



' 40 



Select unrecorded defect management 
working area neighboring border 



K 



Recording end position 



/2003 



Record SDFL and SDDS 



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FIG. 22 



Defect 
management 
working area 



1 block 



\ 
1 block 

\ 



Defect list 



Space bit nriap 



DDS 



Defect list beginning 
positional information 



Space bit map beginning 
positional information 



Other information 



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FIG. 23 



Lead-in 
area 4 



Data 
area 5 



Lead-out 
area 6 



First defect 
management area 



Second defect 
management area 



Spare area 



User data area 



Spare area 



Third defect 
management area 



Fourth defect 
management area 



'10 



Disc 
definition 
structure 



Defect list 



,17 



,16 



,17 
,12 

-13 



14 



Defect list 
beginning 
positional 

information 



Other 

information 



15 



Defect list 
header (the 
number of defect 
entries, etc.) 



Defect entry #1 



Defect entry #M 



30 

/ 

31 

/ 

32 

/ 

33 

/ 

33 



400 



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FIG. 24 



I/O Bus 



'170 



Optical disc 
recording/reproduction apparatus 



no 



Command processing section 



'120 



Recording control section 



'130 



Reproduction control section 



Defect management 
Information storage buffer 



'140 



Data buffer 



150 



Defect management 
information processing section 



'180 



Defect management 
information 
reading section 



Defect management 
information 
writing section 



161 



162 



Defect management 
information 
control memory 



Defect management 
information 
updating section 



163 



164 



200