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



(19) World Intellectual Property 
Organization 

International Bureau 

(43) International Publication Date 
24 June 2004 (24.06.2004) 




PCT 



(10) International Publication Number 

WO 2004/053874 Al 



(51) International Patent Classification 7 : G11B 20/18, 

G06F 12/10, G11B 7/004 

(21) International Application Number: 

PCT/KR2003/002595 

(22) International Filing Date: 

27 November 2003 (27.11.2003) 



(25) Filing Language: 

(26) Publication Language: 



English 
English 



(30) Priority Data: 

10-2002-0078889 

1 1 December 2002 (11.1 2.2002) KR 
10-2003-0005212 27 January 2003 (27.01.2003) KR 
10-2003-0009893 

17 February 2003 (17.02.2003) KR 
10-2003-0013199 3 March 2003 (03.03.2003) KR 

(71) Applicant: FO ELECTRONICS TNC. [KR/KR] ; 20, 
Yoido-dong, Youngdungpo-gu, 150-721 Seoul (KR). 

(72) Inventors: PARK, Yong Cheol; 215-204, Jugong APT., 
Wonmun-dong, 427-030 Gwachon-si, Gyeonggi-do (KR). 
KIM, Sung Dae; 1110-1406, Jugong APT., Sanbon l(il)- 
dong, 435-746 Gunpo-si, Gyeonggi-do (KR). 



(74) Agents: BAHNG, Hae Cheol et al.; Kims International 
Patent & Law Office, 15th Floor Yo Sam Building, 648-23,, 
Yeoksam-dong, Kangnam-gu, Seoul 135-080 (KR). 

(81) Designated States (national): AE, AG, AL, AM, AT, AU, 
AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH, CN, CO, CR, 
CI J, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, EI, GB, GD, 
GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, 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, PH, PL, PT, RO, RU, 
SC, SD, SE, SG, SK, SL, SY, TJ, TM, TN, TR, TT, TZ, UA, 
UG, UZ, VC, VN, YU, ZA, ZM, ZW. 

(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, BE, BG, CH, CY, CZ, DE, DK, EE, 
ES, FI, FR, GB, GR, HU, IE, IT, LU, MC, NL, PT, RO, SE, 
SI, SK, TR), OAPI patent (BF, BJ, CF, CG, CI, CM, GA, 
GN, GQ, GW, ML, MR, NE, SN, TD, TG). 

Published: 

— with international search 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. 



(54) Title: METHOD OF MANAGING OVERWRITE AND METHOD OF RECORDING MANAGEMENT INFORMATION ON 
AN OPTICAL DISC WRITE ONCE 



! Data | 
(overwrite)] 

t 1 



00 



Lead-in 



Size_l 



TDMA 
(TDFL) 



ISA 



^Original recorded data^x; 



Data 
(overwrite' 



0SA 



Lead- Out 



Overwrite entry- 



Case 1) 
Case 2) 



Status 1 


Defective cluster first PSN 


Status 2 


Replacement cluster first PSN | 




1100 


A address 


Size_l 


C address 




1100 


A address 


0000 


C address 


1100 


Size_l 


0000 


Size_l 



Oit Size_l >= 16 clusters 



o 



(57) Abstract: A method of managing overwrite and a method of recording management information on an optical disc write once 
can make it possible to perform a logical overwrite on the disc and thus heighten the use efficiency of the disc. The method includes 
replacement-recording data which is requested to be overwritten in a specified area of the disc where recording is completed in 
another data area physically separated from the specified area in the disc, and producing and recording management information for 
reproducing the physically replacement -recorded data. 



WO 2004/053874 



PCT/KR2003/002595 



METHOD OF MANAGING OVERWRITE AND METHOD OF 
RECORDING MANAGEMENT INFORMATION ON AN OPTICAL DISC 

WRITE ONCE 

5 Technical Field 

The present invention relates to a method of managing overwrite and a 
method of recording management information on an optical disc write once. 

10 Background Art 

Recently, it is expected that a new HD-DVD (High-Density Digital 
Versatile Disc) on which video data and audio data can be written and stored in 
high qualities and in large quantities, for example, a BD-RE (Blu-ray Rewritable 
15 Disc), will be developed and produced. 

The BD-RE, as shown in FIG. 1, is divided into an LIA (Lead-In Area), a 
data area, and an LOA (Lead-Out Area). In the head and the tail of the data area, 
an ISA (Inner Spare Area) and an OSA (Outer Spare Area) are dividedly 
arranged. 

20 The BD-RE records data in the unit of a cluster corresponding to a 

specified recording unit, and as shown in FIG. 1, it is detected if any defect area 
exists in the data area during recording the data. If the defect area is detected, a 
series of replacement-recording operations for performing a replacement 
recording of the data recorded in the defect area in the unit of a cluster in a spare 

25 area, for example, an ISA, is performed. Also, position information of the defect 
area and position information replacement-recorded in the spare area are 
recorded and stored in a defect list in the read-in area as management 



WO 2004/053874 PCT/KR2003/002595 

2 

information. 

Accordingly, even if the defect area exists in the data area of the BD-RE, 
the data recorded in the defect area is replacement-recorded in the spare area, 
and during the reproducing operation, the data replacement-recorded in the spare 
5 area, instead of the data of the defect area, is read out and reproduced with 
reference to the management information, so that any data recording/reproducing 
error can be prevented in advance. 

Meanwhile, the standardization of a BD-WO (Blu-ray Disc Write Once) 
has recently been discussed among companies concerned, and since the BD-WO 
10 is recordable only once over the whole area of the disc, it is physically 
impossible to perform overwrite on the BD-WO unlike the BD-RE. 

However, it may be necessary to perform the overwrite on a BD-WO in 
order to edit the recorded data, to modify a part of the recorded data, or to offer 
convenience to a user or a host, and thus an efficient scheme for this is urgently 
15 demanded. 

Disclosure of Invention 

Accordingly, the present invention is directed to a method of managing 
20 overwrite and a method of recording management information on an optical disc 
write once that substantially obviate one or more problems due to limitations and 
disadvantages of the related art. 

An object of the present invention is to provide a method of managing 
overwrite, a method of recording management information on an optical disc 
25 write once, and a recording/reproducing device which make it possible to 
overwrite logically on the optical disc write once. 

Additional advantages, objects, and features of the invention will be set 



WO 2004/053874 PCT/KR2003/002595 

3 

forth in part in the description which follows and in part will become apparent to 
those having ordinary skill in the art upon examination of the following or may 
be learned from practice of the invention. The objectives and other advantages of 
the invention may be realized and attained by the structure particularly pointed 
5 out in the written description and claims hereof as well as the appended 
drawings. 

To achieve these objects and other advantages and in accordance with the 
purpose of the invention, as embodied and broadly described herein, a method of 
managing overwrite on an optical disc write once includes replacement- 
recording data which is requested to be overwritten in a specified area of the disc 
where recording is completed in another data area physically separated from the 
specified area in the disc, and producing and recording management information 
for reproducing the physically replacement-recorded data. 

In another aspect of the present invention, a method of recording 
management information on an optical disc write once includes replacement- 
recording data of an area of the disc, where an overwrite is requested or a defect 
is produced, in a specified area of the disc, and in recording management 
information on the overwrite, separately recording the management information 
in a case that one recording unit is replacement-recorded and the management 
information in a case that a plurality of recording units are replacement-recorded. 

In still another aspect of the present invention, a method of recording 
management information on an optical disc write once includes replacement- 
recording data of an area of the disc, where an overwrite is requested or a defect 
is produced, in a specified area of the disc, and in recording management 
information on the overwrite, separately recording the management information 
in a case that the data is replacement-recorded by an overwrite request and the 
management information in a case that the data is replacement-recorded due to a 



WO 2004/053874 PCT/KR2003/002595 

4 

defect area. 

In still another aspect of the present invention, an apparatus for 
recording/reproducing an optical disc write once includes a controller for 
transferring a recording command for requesting recording on a specified area of 
5 the disc, and a recording/reproducing device for judging whether the specified 
area is an area where recording is completed or an area where no recording is 
performed, and replacement-recording data in another area of a data area and 
recording a fact that the replacement recording has been performed as 
management information on the disc if it is judged that the specified area is the 
10 area where the recording is completed. 

Brief Description of the Drawings 

The accompanying drawings, which are included to provide a further 
15 understanding of the invention and are incorporated in and constitute a part of 
this application, illustrate embodiments of the invention and together with the 
description serve to explain the principle of the invention. In the drawings: 

FIG. 1 schematically illustrates the construction of a rewritable optical 
disc and a defect management method according to the related art; 
20 FIG. 2 illustrates a method of managing overwrite on an optical disc write 

once according to an embodiment of the present invention; 

FIG. 3 illustrates a method of managing overwrite on an optical disc write 
once according to another embodiment of the present invention; 

FIGs. 4A, 4B and 5 illustrate methods of managing overwrite on an 
25 optical disc write once according to still other embodiments of the present 
invention; 

FIG. 6 schematically illustrates a method of recording management 



WO 2004/053874 PCT/KR2003/002595 

5 

information on a rewritable optical disc according to the related art; 

FIG 7 illustrates a method of recording management information on an 
optical disc write once according to an embodiment of the present invention; 

FIGs. 8A and 8B illustrate tables showing contents of management 
5 information on an optical disc write once of FIG 7 according to the present 
invention; 

FIG 9 illustrates a method of recording management information on an 
optical disc write once according to another embodiment of the present 
invention; 

10 FIG 10 illustrates a method of recording management information on an 

optical disc write once according to still another embodiment of the present 
invention; 

FIGs. 11 A and 11B illustrate tables showing contents of management 

» 

information on an optical disc write once of FIGs. 9 and 10 according to the 
15 present invention; 

FIG 12 illustrates a method of updating management information on an 
optical disc write once of FIGs. 9 and 10 according to the present invention; and 

FIG. 13 illustrates a device for recording/reproducing an optical disc write 
once according to the present invention. 

20 

Best mode for Carrying Out the Invention 

Reference will now be made in detail to the method of managing 
overwrite on an optical disc write once according to the preferred embodiments 
25 of the present invention, examples of which are illustrated in the accompanying 
drawings. Wherever possible, the same reference numbers will be used 
throughout the drawings to refer to the same or like parts. 



WO 2004/053874 PCT/KR2003/002595 

6 

The present invention makes it possible to perform overwrite even on an 
optical disc write once. The term "overwrite" means a repeated recording on a 
specified area in a rewritable optical disc. In other words, overwrite is just the 
inherent characteristic of the rewritable optical disc, and it is generally known 
5 that it is impossible to perform overwrite on the optical disc write once. 

However, the present invention makes it possible to logically perform 
overwrite as the physical characteristic of the optical disc write once is 
maintained. 

FIG. 2 illustrates a method of managing overwrite on an optical disc write 
10 once according to an embodiment of the present invention. For example, the 
BD-WO (Blu-ray Disc Write Once) includes an LIA (Lead-In Area), a data area, 
and an LOA (Lead-Out Area). In the head and the tail of the data area, an ISA 
(Inner Spare Area) and an OSA (Outer Spare Area) may be dividedly arranged. 

Also, in the disc, a TDMA (Temporary Defect Management Area) is 
15 provided. A TDFL (Temporary Defect List) is recorded in the TDMA, and a 
defect entry or an overwrite entry is recorded in the TDFL as management 
information. Accordingly, in the case that the data of the corresponding area is 
replacement-recorded in another area in the data area due to the defect area or by 
an overwrite request, the management information is recorded as the TDFL in 
20 the TDMA. 

In FIG. 2, if an already recorded area already exists in the data area, the 
'overwrite 5 in the corresponding area is not physically permitted due to the 
characteristic of the optical disc write once. However, if a recording command of 
a user or a host requests performing of the recording on an A-B area (e.g., 
25 already recorded area) as shown in FIG 2, the present invention makes a driver 
itself perform the replacement recording of data in another area in the data area. 
Accordingly, the user or the host can command the recording irrespective of 



WO 2004/053874 PCT/KR2003/002595 

7 

whether the specified area of the disc is recorded or not, and thus the user can 
use the optical disc write once just like the rewritable optical disc. This is called 
a logical overwrite (LOW) in distinction from the physical overwrite. 

Specifically, in carrying out the recording command on the A-B area as 
5 shown in FIG. 2, overwrite cannot be performed on the corresponding area since 
it is already recorded area. Instead, the recording command can be carried out in 
a manner that the data is replacement-recorded in a C-D area in front of an OSA 
(Outer Spare Area) in the data area, and the corresponding management area is 
recorded in the TDMA of the disc as the TDFL information. Thereafter, if a user 

10 or a host commands the reproducing of the data in the A-B area of the disc, the 
driver reproduces the data stored in the C-D area instead of the data in the A-B 
area with reference to the recorded management information. 

FIGs. 3, 4A 5 4B and 5 show the different areas where the replacement 
recording is performed by the overwrite request, and FIGs. 6 to 12 show 

15 methods of recording management information on overwrite or consecutive 
defect areas according to the embodiments of the present invention. It is noted 
that the same reference numbers will be used throughout the drawings to refer to 
the same or like parts. 

FIG. 3 illustrates a method of managing overwrite on an optical disc write 

20 once according to another embodiment of the present invention. This 
embodiment is characterized in that the data of the area where overwrite is 
requested is replacement-recorded to follow the already recorded area. This 
embodiment is the same as the embodiment of FIG 2 except for the 
replacement-recorded area. 

25 FIG. 4A shows a method of managing overwrite on an optical disc write 

once according to still another embodiment of the present invention. This 
embodiment is characterized in that the data of the area (e.g., A-B area) where 



WO 2004/053874 PCT/KR2003/002595 

8 

overwrite is requested is replacement-recorded in the C-D area in the spare area. 

Thus, in the spare area, both a replacement cluster due to the defect area and a 

replacement cluster due to the overwrite request are recorded. As will be 

explained later, this means that the replacement recording due to the overwrite 
5 request can be treated in the same manner as the replacement recording due to 

the defect area. Also, as shown in FIG. 4B, the OS A can be divided into an area 

for defect and an area for overwrite. 

FIG 5 shows a method of managing overwrite on an optical disc write 

once according to still another embodiment of the present invention. In FIG. 5, 
10 the data to be recorded in the area (e.g., A~B area) where overwrite is requested 

is replacement-recorded in the C-D area in a separate overwrite area (OWA). 

That is, the spare area ISA or OSA is the replacement-recorded area when the 

defect area is produced, and the OWA is the replacement-recorded area when 

overwrite is requested. Accordingly, the replacement recording due to the defect 
15 area and the replacement recording by the overwrite request are clearly 

discriminated from each other. 

FIGs. 6 to 12 show methods of recording management information 

according to the related art and according to the present invention. Referring to 

FIG. 6, a method of recording management information on the BD-RE disc 
20 according to the related art is illustrated in comparison to the method of 

recording management information on the BD-WO according to the present 

invention. 

The defect information is recorded in the LIA of the disc, and is 
composed of a defect list header and a defect entry. The defect list header 
25 includes an identifier (ID) information for information the defect list and 
information which indicates the number of defect entries. One defect entry is 
composed of 8bytes, and includes four fields of 'status!', 'defective cluster first 



WO 2004/053874 PCT/KR2003/002595 

9 

PSN (Physical sector number) 5 , 'status2' and 'replacement cluster first PSN\ In 
the BD-RE, the c status 1' information indicates information on the type of defect 
entry. For example, if it is '0000b', it is a RAD (Re-Allocation Defective) type 
defect entry where the replacement recording is normally completed, and if it is 
5 '0001b', it is an NRD (Non-Reallocation Defective) type defect entry where a 
replacement area for the replacement recording is not designated. Also, the 
'defective cluster first PSN' field is for recording positional information of the 
cluster where the defect is produced, and it is general that this field is indicated 
as the first PSN of the corresponding cluster. Also, the fi status2' field is a field 

10 which is not used in the BD-RE. To be explained later, according to the present 
invention, the management information is recorded actively using the < status2' 
field. The 'replacement cluster first PSN' field is for recording positional 
information of the replacement-recorded area in the spare area due to the defect 
area. In the case of the RAD type defect entry, the information on the 

15 corresponding replacement-recorded position is normally recorded, but in the 
case of the NRD type defect entry, the replacement recording is not performed 
and thus this field is set to a 'zero 5 value. 

FIGs. 7 to 12 illustrate methods of recording management information on 
an optical disc write once according to embodiments of the present invention. In 

20 the present invention, the recording of the management information is briefly 
divided into two types. First is to record the management information as the 
overwrite entry which is discriminated from the defect entry as shown in FIGs. 
8A, 8B and 9, and second is to record the management information as the same 
type as the defect entry as shown in FIGs. 10 to 12. In the former, the two kinds 

25 of entries are discriminated from each other even through a sorting, but in the 
latter, the two kinds of entries are mixed through the sorting. 

Hereinafter, the method of recording management information according 



WO 2004/053874 PCT/KR2003/002595 

10 

to the present invention will be explained in detail. 

FIG. 7 illustrates a method of recording management information on an 
optical disc write once when the replacement recording is performed by the 
overwrite request according to an embodiment of the present invention. FIGs. 
5 8A and 8B illustrate the recording of positional information of the area where 
overwrite is requested, positional information of the replacement-recorded area, 
and size information of the overwrite as the management information. 

In the present invention, for example, for the compatibility with the BD- 
RE, the management information is recorded as the entry having a size of 8bytes 

10 in the area where the defect entry is recorded. Accordingly, the management 
information is recorded by applying four fields, which are the same as those of 
the defect entry. However, the management information due to overwrite is 
called the overwrite entry in distinction from the defect entry, and an ID 
information is used in the entry for discrimination. 

15 The overwrite entry of FIG. 7 will be explained in detail. First, the type 

information, which is not used in the existing BD-RE, is used in the 'status V 
field. For example, if it is confirmed that c 1100b ? is used and the entry confirms 
the use of 6 1100b 5 , the system recognizes it as the 'overwrite entry'. That is, the 
' status 1' field value, which is not used in the BD-RE, is used to discriminate the 

20 overwrite entry from the defect entry. In the 'defective cluster first PSN' field, 
start address information (e.g., A address) of the area, where overwrite is 
requested, is recorded. In the 'replacement cluster first PSN' field, start address 
information (e.g., C address) of the replacement-recorded area in the data area is 
recorded. It is possible to express such address information as the first PSN of 

25 the start cluster of the corresponding area. In the 'status2' field, the size 
information, with which overwrite is requested, is recorded. However, the 
'status2' field is composed of 4bits, and if the size of the area where the 



WO 2004/053874 PCT/KR2003/002595 

11 

overwrite is requested exceeds 16 clusters, it cannot sufficiently express the size 
of the area. Thus, if clusters the number of which is less than 16 clusters is to be 
overwritten, the size information size_l is recorded in the 'status2' field (case 1), 
but if the size exceeds 16 clusters, the size information size_l is recorded in the 
5 'defective cluster first PSN' field and in the 'replacement cluster first PSN' field, 
respectively, or it is recorded in either of the fields, and '0000V is recorded in 
the c status2' field (case 2). 

Accordingly, if the 'statusl' field is '1100b ? 5 the system recognizes the 
overwrite entry, and if the 'status2' field is '0000b', the system recognizes that 
10 the size exceeds 16 clusters and the size information is indicated by the 
consecutive entries. If the 'status2' field has a value different from c 0000b', the 
system recognizes that the clusters as large as the value obtained by converting 
the corresponding digital value into a decimal number corresponds to the size 
information with which the overwrite is requested. By recognizing the start 
15 address and the size information, the end address of the corresponding area can 
be naturally confirmed. 

FIG. 7 illustrates only the case that the replacement-recorded area is in 
front of the OSA. However, as shown in FIGs. 3,4A, 4B and 5, the replacement- 
recorded area may follow the recording area (FIG. 3), may be in the spare area 
20 (FIG. 4), or may be in a separate OWA (FIG. 5). 

FIG. 8 A schematically illustrates the structure of the TDFL. In the TDFL, 
the defect entries and the overwrite entries are separately recorded. This is the 
result of sorting the entries based on the ' status V information. Also, the TDFL- 
header of the TDFL additionally has information on the number of defect entries 
25 and the overwrite entries, and thus the information of th entries recorded in the 
corresponding TDFL can be obtained. 

FIG. 8B illustrate a table of entry types discussed in FIG. 7. In the table, 



WO 2004/053874 PCT/KR2003/002595 

12 

the defect entry and the overwrite entry are discriminated by the 6 status 1' field. 
Also, the overwrite entry is divided into a case of having one entry and a case of 
having two entries in accordance with the 'status2' field value. If 'status2 = 
0000b \ it corresponds to two entries, and the size information can be obtained 
5 through the following entry. If 'status2 = others except for 0000b ? , the 
corresponding value directly means the size information. 

FIGs. 9 and 10 illustrate methods of recording management information 
on an optical disc write once according to other embodiments of the present 
invention. FIGs. 9 and 10 show the case that if the overwrite is requested, the 

10 management information on the replacement recording is processed as the same 
type as the existing defect entry. That is, the management information is 
recorded under the assumption that the replacement recording by the overwrite 
request is the same as the replacement recording due to the defect area. In this 
case, it is more preferable to discriminate whether the number of replacement- 

15 recorded recording units is singular or plural (in the case of the BD-WO, cluster) 
than to discriminate whether the replacement recording is due to the overwrite or 
the defect area. 

That is, according to this embodiment, the plural clusters are 
replacement-recorded in another area by a certain cause, and the management 

20 information for managing this is expressed in distinction from the management 
information in the case that one recording unit is replacement-recorded. 
Accordingly, the reason why the plural clusters are replacement-recorded may be 
the overwriting according to the present invention, or the plural defect areas 
produced in the consecutive recording units. In the present invention, the 

25 replacement recording of the consecutive plural clusters is called a 'block linear 
replacement' or simply a 'block replacement 5 . On the contrary, the replacement 
recording of one cluster is called a c l cluster linear replacement' or simply a '1 



WO 2004/053874 PCT/KR2003/002595 

13 

cluster replacement 5 . 

According to the methods illustrated in FIGs. 9 and 10, if the overwrite of 
a specified area (e.g., A-B area) of the disc is requested by the user or 
consecutive defects are produced in all the corresponding areas, the 
5 corresponding data is replacement-recorded in the C-D area of the spare area, 
and its management information is recorded. Even if the replacement recording 
is performed in another data area except for the spare area in the case of the 
overwrite as shown in FIGs. 2, 3, 4A, 4B and 5, the management information 
recording method according to the invention can be applied as it is. 

10 In FIGs. 9 and 10, the defect entry is divided into two kinds. First is the 

entry (1 cluster replacement) in the case that one recording unit is replacement- 
recorded, and second is the entry (block replacement) in the case that the plural 
recording units are replacement-recorded. That is, the management information 
recording method of FIGs. 9 and 10 records the management information by 

15 discriminating whether the replacement recording unit is '1 cluster' or 'block' , 
and it is assumed that the overwrite request or the defect area is produced in the 
unit of ' 1 cluster' or 'block'. 

Also, referring to FIGs. 9 and 10, the defect entry is divided according to 
whether the size information is used as the management information. FIG. 9 

20 illustrates the case that the size information is used, and FIG. 10 illustrates the 
case that the size information is not used. 

First, in FIG. 9, in the case of the '1 cluster replacement', the 
management information is recorded in the same manner as in FIG. 7. In the case 
of the c block replacement 9 , the ' status V field has ' 0000b' in the same manner as 

25 the case of the '1 cluster replacement'. The sorting is applied whenever the 
defect entry is recorded in the TDFL. The first basis of the sorting is the 'status 1 9 
field, and the next is the 'defective cluster first PSN' field. Accordingly, if the 



WO 2004/053874 PCT/KR2003/002595 

14 

replacement recording is normally performed, the '1 cluster replacement' and the 
'block replacement' have the same 4 status 1 = 0000b', and thus in the same 
' status 1 ', the sorting is performed by the 'defective cluster first PSN' field. This 
is why the 'statusl' field has '0000b' both in the case of the 'block replacement' 
5 and in the case of the '1 cluster replacement'. This feature will be explained in 
detail with reference to FIG. 12. 

Accordingly, the discrimination between the case of the '1 cluster 
replacement' and the case of the 'block replacement' is performed using the 
'atatus2' field. That is, in the case of the '1 cluster replacement', e status2 = 

10 0000b, but in the case of the 'block replacement', c status2 = 0001b or 1001b'. 
Here, in the case of the 'block replacement', it has two consecutive entries. If 
'status2 = 0001b', the entry will be the first leading entry, and if 'status = 1001b', 
the entry will be the second following entry. The first entry, which is 'status2 = 
0002b', has the original start address of the original area to be replaced and a 

15 replacement start address of the replacement-recorded area. The second entry, 
which is 'status2 = 0001b or 1001b', has the size information size_l of the area 
to be replaced. 

FIG. 9 shows the recording of 'sttus2 = 0001b or 1001b' in the case of the 
block replacement according to an embodiment of the present invention, and it is 
20 natural that any other information which is discriminated from 'status = 0000b' 
can be used. For example, in the case of the block replacement, the same result 
can be obtained even if it is set that 'status2 = 001 lb or 1 0 1 lb' . 

FIG. 10 illustrates the case that the second entry of FIG. 9 has the original 
end address of the original area and the replacement end address of the 
25 replacement-recorded area instead of the size information used in the second 
entry of FIG. 9. Other parts are the same as those in FIG. 9. 

FIG. 11A schematically illustrates the entry being recorded in the TDFL 



WO 2004/053874 PCT/KR2003/002595 

15 

as the management information in recording the management information on the 
optical disc write once according to the present invention. All the entries are 
managed as the same defect entries (in fact, both the replacement recording due 
to the overwrite and the replacement recording due to the defect area have the 
5 same c status 1 = 0000b ' , and this is called the defect entry). In the TDFL header, 
information, which indicates the number of defect entries for each kind, is placed. 
Here, the entry in the case of the 'block replacement' may be called a BRAD 
(Block RAD) or a CD A (Consecutive Defective Area). This is to indicate that in 
the case of the 'block replacement', the block RAD is the same as that in the 
10 case of the '1 cluster replacement', which is normally replacement-recorded, but 
the replacement recording is performed in the unit of a block, not in the unit of a 
cluster. 

FIG. 11B illustrates a table showing the entry-type relation as described 
with reference to FIGs. 9 and 10. As shown in the table, in the case of the c l 

15 cluster replacement', the entry has c status2 = 0000b', and in the case of the 
'block replacement', the entry has 'status 2 = 0001b or 1001b'. Also, in the case 
that the replacement recording is normally completed, the entry has 6 status 1 = 
0001b 5 (NRD or BNRD). By extension in this manner, the table will be able to 
be applied to any type entry. 

20 FIG. 12 illustrates a method of updating the TDFL in the management 

information recording method as shown in FIGs. 9, 10, 11 A and 11B, and 
especially shows the management information recording method in the case that 
the sorting is applied. 

First, under the assumption that the TDFL was recorded as TDFL#K by 5 

25 c l -cluster-replacements', 6 consecutive clusters including defective areas which 
correspond to the defect entries 3, 4 and 5 have been replacement-recorded as 
the 'block replacement'. At this time, a new entry will be recorded at the update 



WO 2004/053874 PCT/KR2003/002595 

16 

time of the TDFK#K+1, and since the defect entries 3, 4 and 5 recorded in the 
previous TDFL#K includes in the 'block replacement' area in the TDFL#K+1, 
they require no further management and thus are omitted in the TDFL#K+1. 
That is, since the defect entries 3 5 4 and 5 can be expressed as a new BRAD type 

5 entry they are not recorded as the management information in the TDFL#K+1. 
Accordingly, the number of final entries of the TDFL#K+1 will be three, and the 
three entries are first aligned based on the c status V information by sorting, and 
then aligned in the order of positions of their original areas before the 
replacement. By applying this to the case of FIG. 12, all the entry types RAD or 

10 BRAD have the same 'status 1 = 0000b' in TDFL#K+1, and thus the entries are 
aligned in the order of PSNs (Physical Sector Numbers) of the replaced original 
areas, which is the second basis of sorting. By doing so, the number of defect 
entries produced due to the 'block replacement' can be reduced, and this makes 
it possible to efficiently use the management area of the optical disc write once. 

15 FIG. 13 illustrates an apparatus for recording/reproducing an optical disc 

write once according to the present invention. 

The recording/reproducing apparatus includes a recording/reproducing 
device for performing the recording/reproducing on the optical disc, and a host 
or controller for controlling the device. The controller for providing a 

10 recording/reproducing command to the recording/reproducing device, and the 
recording/reproducing device performs the recording/reproducing on a specified 
area of the disc according to the command of the controller. The 
recording/reproducing device 10 comprises an interface 12 for performing a 
communication with the outside, an optical pickup 11 for recording or 
5 reproducing data on the disc, a data processor 13 for receiving the reproduced 
signal from the optical pickup to restore to a desired signal value, or modulating 
the signal to be recorded to a signal which can be recorded on the disc to transfer 



WO 2004/053874 PCT/KR2003/002595 

17 

the modulated signal, a servo unit 14 for controlling the optical pickup 11 in 
order to accurately read the signal from the optical disc or to accurately write the 
signal on the disc, a memory 15 for temporarily storing various information 
including the management information and data, and a microcomputer 16 for 
5 controlling constituent elements of the recording/reproducing device. 

During the recording operation, all the management information of the 
disc is read out and stored in the memory 15 of the recording/reproducing device, 
and the management information is used for the recording/reproducing operation 
on the optical disc. The controller 20, if it is required to record data in a specified 

10 area of the disc, transfers the positional information to the recording/reproducing 
device along with the data to he recorded. The microcomputer 16 in the 
recording/reproducing device 10 receives the recording command, and judges 
whether the area of the optical disc in which the controller 20 desires to record 
data is an already recorded area or a non-recorded area from the management 

15 information stored in the memory 15. If it is judged that the area is the non- 
recorded area, the microcomputer 16 performs the recording in accordance with 
the recording command of the controller 20, and if it is judged that the area is the 
already recorded area, the microcomputer 16 replacement-records the data in 
another area of the data area. Accordingly, the microcomputer 16 transfers the 

20 positional information of the replacement-recorded area and the data to the 
server unit 14 and the data processor 13, so that the replacement recording can 
be performed at the desired position in the disc through the optical pickup 11. 

During the reproducing operation, all the management information of the 
disc is read out and stored in the memory 15 of the recording/reproducing device, 

25 and the management information is used for the recording/reproducing operation 
on the optical disc. The controller 20, if it is required to reproduce data recorded 
in a specified area of the disc, transfers the positional information to the 



WO 2004/053874 PCT/KR2003/002595 

18 

recording/reproducing device. The microcomputer 16 in the 
recording/reproducing device 10 receives the reproducing command, and judges 
whether the data has been replacement-recorded in another area of the data area. 
This can be confirmed using the defect entry or the overwrite entry recorded in 
5 the TDFL as described above. Accordingly, if the area desired to be reproduced 
is not the replaced area, the controller reproduces the corresponding area, and 
transmits the reproduced information to the controller 20. If the data has been 
replacement-recorded in another area, the microcomputer reproduces the 
corresponding replacement-recorded area, and transmits the reproduced 
10 information to the controller 20. 

Industrial applicability 

Accordingly, the present invention makes it possible to logically perform 
15 overwrite as the physical characteristic of the optical disc write once is 
maintained. 

It will be apparent to those skilled in the art than various modifications 
and variations can be made in the present invention. Thus, it is intended that the 
present invention covers the modifications and variations of this invention 
20 provided they come within the scope of the appended claims and their 
equivalents. 



WO 2004/053874 



PCT/KR2003/002595 



19 

What is claimed is: 

1- A method of managing overwrite on an optical disc write once, 
comprising: 

5 replacement-recording data which is requested to be overwritten in a 

specified area of the disc where recording is completed in another data area 
physically separated from the specified area in the disc; and 

producing and recording management information for reproducing the 
physically replacement-recorded data. 

10 

2. The method of claim 1 5 wherein the data requested to be overwritten is 
replacement-recorded before an outer spare area among the data area of the disc. 

3. The method of claim 1, wherein the data which is requested to be 
15 overwritten is consecutively replacement-recorded after a final data recording 

position among the data area of the disc. 

4. The method of claim 1, wherein the data which is requested to be 
overwritten is replacement-recorded in an overwrite area separately allocated in 

20 the data area of the disc. 

5. The method of claim 1, wherein the data which is requested to be 
overwritten is replacement-recorded in a spare area of the disc. 

25 6. The method of claim 1, wherein the management information includes 

address information of the specified area which is requested to be overwritten, 
size information of the area, and address information of a replacement-recorded 



WO 2004/053874 PCT/KR2003/002595 

20 

position, which are recorded in association with one another. 



7. The method of claim 6, wherein if a size of the area which is requested 
,to be overwritten is smaller than a specified size, the management information is 

5 recorded as one entry, and if the size of the area is larger than the specified size, 
the management information is recorded as plural entries. 

8. The method of claim 6, wherein the management information is 
recorded hi a temporary defect management area (TDMA) of the disc. 

10 

9. The method of claim 1, wherein the management information includes 
start address information and end address information of the specified area 
requested to be overwritten, and start address information and end address 
information of a replacement-recorded position, which are recorded in 

15 association with one another. 

10. The method of claim 9, wherein the management information is 
recorded as plural entries. 

20 11. The method of claim 1, wherein in recording the management 

information on a replacement-recorded area according to an overwrite request, 
identifier information which is discriminated from the management information 
on a replacement-recorded area is further recorded due to producing of a defect 
area. 

25 

12. A method of recording management information on an optical disc 
write once, comprising: 



WO 2004/053874 PCT/KR2003/002595 

21 

replacement-recording data of an area of the disc, where an overwrite is 
requested or a defect is produced, in a specified area of the disc; and 

in recording management information on the overwrite, separately 
recording the management information in a case that one recording unit is 
5 replacement-recorded and the management information in a case that a plurality 
of recording units are replacement-recorded. 

13. The method of claim 12, wherein identifier information is recorded in 
the management information in order to discriminate the management 

10 information in the case that the one recording unit is replacement-recorded from 
the management information in the case that the plural recording units are 
replacement-recorded. 

14. The method of claim 13, wherein the management information in the 
15 case that the one recording unit is replacement-recorded and the management 

information in the case that the plural recording units are replacement-recorded 
are recorded in the same management area in the disc. 

15. The method of claim 12, wherein the management information in the 
20 case that the one recording unit is replacement-recorded records an original area 

before being replacement-recorded and positional information of the 
replacement-recorded area as one entry. 

16. The method of claim 12, wherein the management information in the 
25 case that the plural recording units are replacement-recorded records start 

address information and end address information of an original area before being 
replacement-recorded, and start address information and end address information 



WO 2004/053874 

22 

of a replacement-recorded position as plural entries. 



PCT/KR2003/002595 



17. A method of recording management information on an optical disc 
write once, comprising: 

5 replacement-recording data of an area of the disc, where an overwrite is 

requested or a defect is produced, in a specified area of the disc; and 

in recording management information on the overwrite, separately 
recording the management information in a case that the data is replacement- 
recorded by an overwrite request and the management information in a case that 
10 the data is replacement-recorded due to a defect area. 

18. The method of claim 17, wherein identifier information is recorded in 
the management information in order to discriminate the management 
information in a case that the data is replacement-recorded by the overwrite 

15 request from the management information in a case that the data is replacement- 
recorded due to the defect area. 

19. The method of claim 18, wherein the management information in a 
case that the data is replacement-recorded by the overwrite request and the 

20 management information in a case that the data is replacement-recorded due to 
the defect area are recorded in the same management area in the disc, but are 
separately recorded by sorting. 

20. An apparatus for recording/reproducing an optical disc write once, 
25 comprising: 

a controller for transferring a recording command for requesting 
recording on a specified area of the disc; and 



WO 2004/053874 PCT/KR2003/002595 

23 

a recording/reproducing device for judging whether the specified area is 
an area where recording is completed or an area where no recording is 
performed, and replacement-recording data in another area of a data area and 
recording a information that the replacement recording has been performed as 
5 management information on the disc if it is judged that the specified area is the 
area where the recording is completed. 



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PCT/KR2003/002595 



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FIG. 8A 



TDFL Header 




TDFL identifier = 'TDL' 


Defect Entry #1 


• 
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Number of Defect entries 
(status 1 = 0000 or 0001) 


• 
• 
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(status 1 = 1100) 


Defect Entry #n 




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• 
• 


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FIG. 8B 



Entry type 


Status 1 


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0000 


0000 


0001 


0000 


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entry 


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0000 


1100 


others | 



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FIG. 11A 



TDFL Header 




TDFL identifier = 'TDL' 


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(status 1 = 0000) 


• 




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BRAD : Block RAD 



FIG. 11B 



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INTERNATIONAL SEARCH REPORT 



International application No. 

PCT/KR 03/02595-0 



CLASSIFICATION OF SUBJECT MATTER 
IPC 7 : G11B 20/18, G06F 12/10, G11B 7/004 

According to International Patent Classification (IPC) or to both national classification and IPC 



B. FIELDS SEARCHED 



Minimum documentation searched (classification system followed by classification symbols) 

IPC 7 : G11B, G06F 



Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched 



Electronic data base consulted during the international search (name of data base and, where practicable, search terms used) 

WPI, EPODOC, PAJ 



C. DOCUMENTS CONSIDERED TO BE RELEVANT 



Category Citation of document, with indication, where appropriate, of the relevant passages 



Relevant to claim No. 



X 



US 5448728 A (TAKANO, S. et aL) 5 September 1995 (05.09.95) 
abstract figs. 2, 5, 10, 11; column 1, line 41 - column 2, line 25; 
column 3, lines 37-50; column 7, lines 31-59; column 9, line 16 - 
column 10, line 23. 

EP 0325823 A1 (LASERDRIVE LTD.) 2 August 1989 (02.08.89) 
abstract, figs. 1, 2, 4; page 2, line 19 -page 3, line 50; page 4, line 
34 - page 5, line 50; page 7, line 4 - page 9, line 45. 

EP 1043723 A1 (MATSUSHITA ELECTRIC INDUSTRIAL CO., 
LTD.) 11 October 2000 (11.10.00) 

abstract, figs. 1-6; paragraphs [0037] f [0062]-[0076], [0082]. 



1-5,12,17,20 



1,4,12,17,20 



1,12,17,20 



□ 



Further documents are listed in the continuation of Box C. 



See patent family annex. 



* Special categories of cited documents: 

„A" document defining the general state of the art which is not 

considered to be of particular relevance 
„E" earlier application or patent but published on or after the international 

filing date 

„L" document which may throw doubts on priority claim(s) or which is 
cited to establish the publication date of another citation or other 
special reason (as specifted) 

„0" document referring to an oral disclosure, use, exhibition or other 
means 

„P" document published prior to the international filing date but later than 
the priority date claimed 



„T" later document published after the international filing date or priority 

date and not in conflict with the application but cited to understand 

the principle or theory underlying the invention 
„X" document of particular relevance; the claimed invention cannot be 

considered novel or cannot be considered to involve an inventive step 

when the document is taken alone 
„Y" document of particular relevance; the claimed invention cannot be 

considered to involve an inventive step when the document is 

combined with one or more other such documents, such combination 

being obvious to a person skilled in the art 
„&" document member of the same patent family 



Date of the actual completion of the international search 

30 January 2003 (30.01.2003) 



Date of mailing of the international search report 

10 March 2004 (10.03.2004) 



Name and mailing adress of the IS A/ AT 

Austrian Patent Office 

Dresdner StraBe 87, A- 1200 Vienna 

Facsimile No. 1/53424/535 



Authorized officer 



LOIBNER K. 



Telephone No. 1/53424/323 



Form PCT/ISA/210 (second sheet) (July 1998) 



INTERNATIONAL SEARCH REPORT 

Information on patent family members 



International atmiication No. 

PCT/KR 03/02595-0 



Patent document cited Publication Patent family Publication 

in search report date member(s) date 



EP 


A 


325823 


EP 


A 


0325823 


1989-08-02 


EP 


A 


1043723 


DE 


T 


6990413BT 


2003-03-27 








DE 


D 


69904138D 


2003-01-09 








DE 


T 


69900901T 


2002-10-10 








TW 


B 


466479 


2001-12-01 








US 


B 


6385148 


2002-05-07 








DE 


D 


6990090ID 


2002-03-28 


US 


A 


5448728 


1995-09-05 JP 


A 


5053734 


1993-03-05 








JP 


A 


5045456 


1993-02-26 



PCT ASA/210 (patent family annex) (July 1998)