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



(19) World Intellectual Property Organization 

International Bureau 




lllllllllllllllllll lllllllllllllll 111 lllllllllllll 



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

10 April 2003 (10.04.2003) pct WO 03/030173 A2 



(81) Designated States (national): AE, AG, AL, AM, AT, AU, 

AZ, BA, BB, BG, BR, BY, BZ, CA, CH, CN, CO, CR, CU, 
CZ, DE, DK, DM, DZ, EC, EE, ES, FI, 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, NO, NZ, OM, PH, PL, PT, RO, RU, SD, SE, SG, 
SI, SK, SL, TJ, TM, TN, TR, TT, TZ, UA, UG, UZ, VC, 
VN, YU, ZA, ZM, ZW. 

(84) Designated States (regional): ARIPO patent (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, IE, IT, LU, MC, NL, PT, SE, SK, 
TR), OAPI patent (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, 
GW, ML, 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 A bbreviations " appearing at the begin- 
ning of each regular issue of the PCT Gazette. 



(54) Title: METHOD AND APPARATUS FOR RECORDING A DIGITAL INFORMATION SIGNAL 




t — (57) Abstract: Method of contiguously recording a sequence of ordered A/V information signals, such as video/audio information, 
^ and corresponding management information signals, such as video management, menu information or file information, on a disc -like 
J™* recording medium of the write-once type, such as an optically recordable and readable disc. The recorded information complies to 
S the requirements of ordering of such information as defined by a disc of the read-only type or of the rewritable type. The method 
comprises allocating a reserved area within a linear' addressing space of the disc, contiguously recording the A/V information signals 
^ in a video recording area located succeeding the reserved area, recording corresponding management data in a temporary overview- 
space succeeding the video recording area, generating a mapping table for mapping the recorded management data to address loca- 
Q tions in the reserved area and recording the mapping table in the temporary overview space. When finalizing the disc, the recorded 
management inrormation signals is copied to the reserved area in correspondence to the latest mapping table information and the 
remaining unrecorded -ax-lions of llic reserved urea is recorded with arbitrary data signals. 



(51) International Patent Classification 7 : G11B 27/034, 

20/12, 27/032, H04N 5/781, 5/85, Gl IB 7/00 

(21) International Application Number: PCT/IB02/03840 

(22) International Filing Date: 

18 September 2002 (18.09.2002) 

(25) Filing Language: English 

(26) Publication Language: English 

(30) Priority Data: 

01203727.1 2 October 2001 (02.10.2001) EP 

(71) Applicant: KONINKLIJKE PHILIPS ELECTRON- 
ICS N.V. [NL/NL]; Groenewoudseweg 1, NL-5621 BA 
Eindhoven (NL). 

^ (72) Inventor: DE HAAN, Wiebe; Prof . Ilolstlaan 6, 

= NL-5 65 6 AA Eindhoven (NL) . 

^= (74) Agent: DE VRIES, Jan; Internationaal Octrooibureau 

= B.V., Prof. Holsflaan 6, NL-5656 AA Eindhoven (NL). 



WO 03/030173 



PCT/IB02/03840 



Method and apparatus for recording a digital information signal 



FIELD OF THE INVENTION 

The invention relates to a method of contiguously recording a sequence of 
ordered A/V information signals, such as video/audio information, and corresponding 
management information signals, such as video management, menu information or file 
5 information, on a disc-like recording medium of the write-once type, such as an optically 
recordable and readable disc, the recorded information complying to the requirements of 
ordering of such information as defined by a disc of the read-only type or of the rewritable 
type. 

The invention also relates to a recording device for contiguously recording a 
10 sequence of ordered A/V information signals, such as video/audio information, and 
corresponding management information signals, such as video management, menu 
information or file information, the recorded information complying to the requirements of 
ordering of such information as defined by a disc of the read-only type or of the rewritable 
type, the recording devive comprising means for carrying and rotating a disc-like recording 
15 medium of the write-once type, such as an optically recordable and readable disc, means for 
scanning a focused laser beams across a track of the disc-like recording medium,means for 
modulating the laser beam in accordance with digital information signals to be recorded on 
the disc-like recording medium, means for detecting reflections of the laser beam scanning 
the disc-like recording medium and converting the reflection in digital information signals to 
20 be read, means for modulating received digital A/V information signals to infonnation 
signals to be recorded and control means for controlling the recording and reading of the 
digital information signal. 

BACKGROUND OF THE INVENTION 
25 A similar method and device are known from for example the International 

Patent Application Application WO 01/01416-A1 (PHN 17522), although the device and 
method disclosed therein are related to discs of the rewritable type only. 

The disclosed video recording format (DVD-Video Format) disclosed therein 
was originally designed for storing audio-visual content on disc of the read-only type, such as 



WO 03/030173 PCT/IB02/03840 

2 

a replicated disc (DVD-ROM/Video). Also disclosed in the referred application is a 
variation of the DVD-Video Format, the DVD-+RW Video Format, suitable for storing video 
in real time on rewritable discs (DVD+RW) in a playback compatible way. 

However, for cost-reasons and for archiving purposes, users might prefer 
5 recordable (or write-once) media to rewritable media. The DVD+RW Video Format could be 
used but it has the disadvantage that certain management information and menu structures 
need to be recorded in advance of the actual video content. Without this management 
information in this location, the disc is not compatible with DVD-ROM/Video or DVD+RW 
players. 

1 0 However, on a recordable disc, such information can only be stored once, so 

no multiple recordings or updates of recordings can be made without accepting restrictions to 
compatibility. 

OBJECT AND SUMMARY OF THE INVENTION 

15 In consequence, amongst other things, it is an obj ect of the invention to 

obviate the above-mentioned disadvantage. According to one aspect a method according to 
the inventions is characterized by allocating a reserved area within a linear addressing space, 
contiguously recording the A/V information signals in a video recording area located 
succeeding the reserved area, recording corresponding management data in a temporary 

20 overview space succeeding the video recording area, generating a mapping table for 
mapping the recorded management data to address locations in the reserved area and 
recording the mapping table in the temporary overview space. 

Further according to one of its aspects a recording device according to the 
inventions is characterized in that, the control means are adapted to allocate a reserved area 

25 within a linear addressing space on the disc-like recording medium, to contiguously record 
record the A/V information signals in a video recording area located succeeding the reserved 
area, to record corresponding management data in a temporary overview space 

succeeding the video recording area, to generate a mapping table for mapping the recorded 
management data to address locations in the reserved area, to record the mapping table in the 

30 temporary overview space. 

The invention is based on the concept of a virtual management area which is 
being mapped to the real physical location by a mapping table. Only when finalizing a disc, 
that is providing the disc with a Lead-in and a Lead-Out area to make the disc playback 



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compatible, the management data structures are copied to the correct location in the reserved 
area. 

A further advantageous embodiment of the method according to the invention 
is characterized by contiguously recording a next sequence of A/V information signals on a 

5 next video recording area succeeding the previously recorded areas, recording next 

corresponding management data in the next temporary overview space succeeding the next 
video recording area, generating a mapping table for mapping the first and the next recorded 
management data to address locations in the reserved area and recording the mapping table in 
the next temporary overview space. 

1 o This has the advantage of recording multiple sequence of A/V information to 

the disc. 

A next advantageous embodiment of the method according to the invention is 
characterized by generating updated corresponding management information signals, 
recording at least the updated management information signals in a next temporary overview 
15 area succeeding the previous temporary overview area, generating an updated mapping table 
for mapping the updated management data and the remaining management data to address 
locations in the reserved area and recording the updated mapping table in the next temporary 
overview space. 

This allows updating of the management data in case a recorded A/V stream is 

20 edited only. 

A following advantageous embodiment of the method according to the 
invention is characterized by copying the recorded management information signals to the 
reserved area in correspondence to the latest mapping table information, recording the 
remaining unrecorded sections of the reserved area with arbitrary data signals, recording a 

25 lead-in area preceding the reserved area with data according to the definitions of a disc of the 
read-only type or of the rewritable type, recording a lead-out area succeeding the recorded 
area with data according to the definitions of a disc of the read-only type or of the rewritable 
type or with closure data for closing an actual video recording session. 

The recording of the management data in a manner such that playback 

30 compatibility is obtained can now be done in a simple straightforward manner. 



BRIEF DESCRIPTION OF THE DRAWINGS 



WO 03/030173 PCT/IB02/03840 
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These and other aspects and advantages of the present invention will be 
clarified in more detail with reference to the disclosure of preferred embodiments, and in 
particular with reference to the appended Figures that show : 

Fig. 1 the DVD-Video data structure on a DVD disc of the Read-Only type; 
5 Fig. 2 a DVD-Video data structure on a DVD disc of the Rewritable type; 

Fig. 3A-3D a DVD-Video data structure on a DVD disc of the Recordable 
type, according to the invention; 

Fig. 4 a Reserved Allocation Table according to a first embodiment of the 

invention; 

^ Fig. 5 a Reserved Allocation Table according to a second embodiment 

according to the invention; 

Fig. 6 a first example of use of a Reserved Allocation Table; 

Fig. 7 a second example of use of a Reserved Allocation Table when making a 
second recording; 

15 Fig. 8 a third example of use of a Reserved Allocation Table when making an 

update of management information; 

Fig. 9 an embodiment of allocation of the Reserved Allocation Table; 
Fig. 10 a method of recording using a Reserved Allocation Table according to 
an embodiment of the invention; 
20 Fig. 11a recording device according to the invention. 

DESCRIPTION OF THE EMBODIMENTS 

Fig. 1 shows the video data structure Ion an optically readable disc of the 
DVD-Read Only type. The sequence of data is arranged from left to right in order of 
25 increasing logical sector numbers (LSN), a sector being the smallest unit of addressing data 
stored on a DVD disc. Typically one sector corresponds to 2048 user data bytes. For clarity 
reasons additional disc zones such as a Lead-in zone and a Lead-out zone are not shown. 

The video data structure 1 comprises a Volume and File System (VOL/FS) 
data 1 2, Video Manager (VMG) data 3, several Video Title Sets (VTS#1, VTS#2, VTS#3, 
30 VTS#n) 4-7. 

Volume and File System 2 data defines the DVD Video Volume space 
according to the Universal Disc Format UDF. The video data in one Volume is composed of 
one Video Manager (VMG) 3 and one or more Video Title Sets (VTS) 4. The file system 
data enables addressing data objects in the so-called DVD Video zone comprising the Video 



WO 03/030173 PCT/IB02/03840 
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Manager (VMG) data 3 and the Video Title Sets 4 (VTS). Adapting the data object in this 
DVD Video Zone may require adapting of the file system data also. 

A Video Title Set (VTS#n) 4 is a unit describing a complete video content or 
Title. It is composed of VTS Information (VTSI#n) to control the Title and the Menu in the 

5 Video Title Set (VTS#n) 4, the Video Object Set for the Menu (VTSM_VOBS) 6, the Video 
Object Set for the Title (VTSTTVOBS) 7 and a backup of the VTSI (BUPVTSI) 8. A 
Video Object Set (VOBS) is a collection of Video Objects (VOB). A VOB being an MPEG 
Program stream made up of a group of Elementary streams, such a Video, Audio, Sub- 
picture, Program Control Information (PCI) and Data Search Information (DSI). 

L0 The VTSI 5, VTSM_VOBS 6 , VTSTT_VOBS 7 and VTSI_BUP 8 shall be allocated in this 
order. Files comprising VTSTT_VOBS 6 shall be allocated contiguously. 

The Video Manager 3 comprises the Video Manager Information (VMGI) 9, 
the Video Object Set for the VMG Menu (VMGM_VOBS) 10 and the backup of the VMGI 
(VMGI_BUP)11. 

15 Fig. 2 shows a DVD-Video data structure 12 on a DVD disc of the Rewritable 

type, specifically according to the DVD+RW type, using same reference numbers as in Fig.l 
to indicate equivalent parts. The shown DVD-Video data structure 12 is according to a 
method and recording device as disclosed in the International Patent Application WO 
01/01416-A1 (PHN 17522), which is incorporated by reference herewith. In order to 

20 maintain playback compatibility with existing DVD-players intended for DVD discs of the 
Read-only type, the restrictions of the corresponding Video data structures 1 on these discs 
should be taken into account, especially when several recording are made. 

In Fig. 2 an example is given showing three recordings (TITLES) represented 
by the Video Object Set for the Title (VTSTT_VOBS#l, VTSTT_VOBS#2, 

25 VTSTT_VOBS#3) 7 and the corresponding Video Title Set Information (VTSI#1, VTSI#2, 
VTSI#3) 5. Typically of the referred method is the order of these data, the VTS management 
information VTSI 5 always preceding the Video Object Sets VTSTT_VOBS 7 and the 
backup data VTSI_BUP 8 always succeeding. This sequence of data can be viewed as one 
Video Object Title Set (VTSTTVOBS) , meeting the restrictions of the DVD-Video data 

30 structure 1 of the DVD-Video disc of the Read Only type. 

Additional to these data, Video Recording Management Information data 
(VRMI) 13 and a corresponding backup VRMI_BUP 14 are present. It includes the 
information to identify which type of recorder has generated the DVD/Video menus on the 
disc. Not shown is other typically recorder information data such as Video Recording 



WO 03/030173 PCT/IB02/03840 
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Management Scratch Area (VRM Scratch) which maybe used by recorders to temporally 
store data and a VRM User Data area which may be used to add additional performance on 
some recorders. This data will be neighboring the VRMI data 13. 

Fig. 3 A illustrates a first example of a DVD Video data structure 15 for a 
5 DVD disc of the Recordable Type (record once) after a first recording according to a first 
embodiment of the invention. This first recording is represented by the VTSTT_VOBS#l and 
the corresponding file and management information which is stored in Management Data 
Areas (MGT1-1, MGT1-2, MGT1-3) 16. These areas comprise the VTSI#1, VMG, VRMI, 
and File System Information such as UDF. In addition the back-up file of the VTSI, the 
0 VRMI and a second AD VP are recorded contiguously in this order. 

The AD VP represents the Anchor Volume Descriptor Pointer that is required 
by the UDF file system. The AD VP is always stored on a fixed location to enable a computer 
system to recognize that the data is stored in the UDF format. The AD VP gives the location 
of a logical volume descriptor sequence (LVDS) which contains a series of data structures 
L5 regarding the structure and location of data stored on the disc. This includes references to one 
or more file set descriptors FSD. The AD VP can thus be regarded as the start of the (UDF) 
file system. A second AD VP is a backup of a this (first) ADVP. 

But for explaining the invention it is not necessary to indicate the type of 
management data but only the occupied areas. The Temporary Overview Space 17 contains 
20 all management information and file information required by the DVD/Video data structure 
for the DVD disc of the rewritable type as disclosed in the above-mentioned patent 
application. 

The Management Data Areas (MGT) 16 is however not recorded in front of 
the VTSTT_VOBS 7, as normally required by the DVD Video Data structures for the DVD 

25 disc of the Read-Only or the Rewritable Type, but is recorded after the VTSTTVOBS 7 of 
the first recording in a Temporary Overview Space (TOS) 17. This Temporary Overview 
Space (TOS) 17 includes a Reserved Space Allocation Table (RSAT) 18 containing a 
mapping of the Management Data Areas (MGT) to locations in the Reserved Space (RES) 19 
in front of the VTTT_VOBS. The Reserved Space 19 is not used for recording until the last 

30 recording has been made and a disc finalization step is being performed. The finalization step 
including copying all Management Data Areas 16 to this Reserved Space 19 using the 
mapping in the Reserved Space Allocation Table 18. Only after such a finalization step, 
playback compatibility with DVD Players intended for DVD Video discs of the Read-Only 



WO 03/030173 PCT/IB02/03840 

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type or the Rewritable Type is being obtained. This will be explained in more detail 
hereafter. 

The Reserved Space 19 starts after the Lead-in Area (LI) 20 and ends at 
Logical Sector Number R. At a typical DVD disc the first Physical Sector after the Lead- 

5 Area 20 is assigned 0003 OOOOh (h: hexa-decimal) and increases to the start of the Lead-Out 
Area (LO) 21 to a value of for instance 00026 0540h. This corresponds to a total of 2 295 104 
(d : decimal) Physical Sectors where a Physical Sector contains 2048 user data bytes. 

However, all Physical Sectors are mapped for addressing purposes to Logical 
Sectors with a Logical Sector Numbering (LSN). The start of the recording space after the 

L 0 end of the Lead-in Area 20 is indicated by Logical Sector Number 0000 OOOOh and increases 
to the start of the Lead-Out area 21 until Logical Sector Number 0022 FF40h. 

The Reserved Space 19 is arranged form Logical Sector Number 0000 OOOOh 
(or Physical Sector Number 0003 OOOOh) to Logical Sector Number 0000 3FFF h (or 
Physical Sector Number 0003 3FFFh), corresponding to approximately 32 Mbyte. This value 

1 5 is chosen in view of the DVD Video Data structure for the a DVD disc of a rewritable type. 
However, the Reserved Space 19 may be chosen any size. Further, multiple reserved areas 
are also possible. 

Mapping may be applied on the basis of Error Correction Blocks (ECC- 
Blocks). A typical DCD ECC block may comprise 16 Physical Sectors in addition to error 

20 correction data. Within an ECC block, data is recorded at the actual location hi the same 
order as it would haven been without at the intended location. 

Additional recordings should be made in the Unrecorded Area (UNREC) after 
the Temporary Overview Space 17. As long as the recordable DVD disc has not been 
finalized, also being indicated by the presence of an open session, the Reserved Space 19 

25 shall not be recorded. 

Next, Fig. 3B shows a Video Data structure 23 according to an embodiment of 
the invention, after a second recording has been made. Same reference numbers indicate 
corresponding structures in Fig. 3A. The second recording, represented by VTSTT_VOBS#2 
27, is appended to the first Temporary Overview Space 17. The corresponding Management 

30 Data (MGT2-1, MGT2-2) 25 and a second Reserved Allocation Space Table (RSAT-2) 26 is 
appended to the second recording. This RSAT-2 contain not only the mapping of the 
Management Data 25 of the second recording, but also the mapping of the Management Data 
16 of the first recording. The Reserved Allocation Space Table RSAT-1 will therefore not 



WO 03/030173 PCT/IB02/03840 

8 

being used anymore. As will be explained hereafter, a Reserved Space Allocation Table 
comprises a version number, to indicate which version is obsolete. 

As a result, the VTSTT-VOBS#l 7, the TOS-1 17, the VTSTT_VOBS#2 and 
the TOS_2 can be regarded as continuous VTSTTVOBS. The sequence may contain 
5 sectors in a format not known to DVD Video Players, but as long they are not referenced by 
any Program Chain, they do not disturb the correct operation of the players. 

A Program Chain is used in the DVD Video data structures for a DVD disc of 
the Read-Only type, to indicate part of or the entire Title or Menu. It defines the Cells to be 
presented, a Cell being the basic unit to be presented. A Cell consists of a number of Video 
[ 0 Object Units (VOBU) and forms part of a VOB. 

Next, Fig. 3C shows a Video Data Structure 28 according to an embodiment of 
the invention, after an update is being made to the management information without 
necessitating to make chances to the corresponding VTSTT_VOBS. For instance, a user may 
edit a recording, resulting in only a change in the VRMI 13. A new menu page may also be 
1 5 needed. Then there may be no need for changing the VTSTT_V OBS 7 or 27. 

The update only effects part of the Management Data (MGT1-1, MGT1-2, 
MGT1-3) of the first recording as only MGT1-3 thereof is obsolete. The new version of 
MGT-3 referred to as MGT1-3' is recorded in a new Temporary Overview Space (TOS-3) 
29 appended to the previous Temporary Overview Space (TOS-2) 18. TOS-3 contains 
20 MGT1 -3 ' and a new Reserved Allocation Space Table (RSAT-3) 3 1 containing the updated 
mapping corrected for MGT1-3 (now obselete) and MGT1 -3 '(replacement). The previous 
Reserved Allocation Space Table (RSAT-2) 26 has become obsolete by this, indicated by 
having TOS-3 the highest version number. 

Next, Fig. 3D shows a Video Data structure 32 according to an embodiment of 
25 the invention, after a finalizing step is being performed. All Data Management Data (MGT1- 
1, MGT1-2, MGT1-3', MGT2-1, MGT 2-2) 16, 30, 25 is copied to the Reserved Space 19, 
comprising also file system data such as UDF. In the remaining space 33 in the Reserved 
Space that is not occupied by the Management Data 16, 30, 25 arbitrary data is recorded. 
Also the Lead-in area 20 and Lead-Out area 21 are being recorded. 
30 It is remarked that the back-up files (VRMI-BUP, VTSI_BUP) 14, 8 are 

included in the last Temporary Overview space (TOS-3) 29 and are not being remapped. 
Including of such files in the Temporary Overview space increases robustness. Also after the 
last VRMI_BUP, a second Anchor Volume Descriptor Pointer (AD VP) 34 should be present, 
as requested by the UDF file system. 



WO 03/030173 PCT/IB02/03840 
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Fig. 4 shows a first embodiment of a Reserved Space Allocation Table 
(RSAT) 18, 26, 31 comprising maximal 1 Logical Sector (2048 bytes). 

The RSATJD 35 (4 bytes) contains a string containing "RSAT". 
The RSAT_COUNT 36 (1 byte) contains a decimal number indicating the 
5 version number of the Reserved Space Allocation Table (18, 26, 3 1). The first time an RSAT 
is recorded, this field is set to 0. For each new version of RSAT the value of this field is 
incremented by one. 

The PREVJLOC (3 bytes) 37 contains the Logical Sector Number (LSN) of 
the location where the previous RSAT can be found. 
10 The ITEMJST ( 1 byte) 38 indicates the number of used RSATJTEMS in the 

RSAT Mapping Table (RSAT_MAPT) 

The RSAT MAPT ( 2032 bytes) 39 contains 254 RSATJTEMS ( 8 bytes) 40 
of 8 bytes each. Used RSATJTEMS 39 are placed before any unused RAST ITEMS 39 . 
All bytes of unused RSATJTEMS 39 are set to 0. The used RSATJTEMS 39 divide the 
1 5 recording area of a DVD disc, between the LI and the LO, into ITEM JNT mapping segments, 
each consisting of a consecutive sequence of logical sectors. The mapping segments are 
linearly mapped on to target segments of the same size. 

A RSATJTEM 40 contains a MAP_STAT 41 (2 bits) indicating the mapping 
status for the segment starting at ADDRLOC 42 of this item and ending just before 
20 ADDR_LOC 42 of the next item. If there is no next item, the mapping status remains the 
same for all following logical sector numbers until the last written sector. 

Possible values of MAPSTT 41 are given in the table within Fig. 4. 00b 
(binary) indicates that the corresponding segment is not recorded and that addresses locations 
are mapped to new target locations. 01b indicates the segment is reserved for a recorded 
25 segment with address locations mapped to new target locations. 1 0b indicates that a segment 
is not recorded and that target locations are identical to addressed locations, lib indicates 
that the segment is recorded and the target locations are identical to the addressed locations. 

ADDR LOC 42 (3 bytes) contains the Logical Sector Number (LSN) of the 
first sector of the mapping segment, such as an ECC-block comprising 16 Physical Sectors. 
30 In that case the ADDR_LOC 42 shall be a multiple of 16. The RSATJTEMS 40 are 
increasing such that ADDR LOC 42 is increasing. 

TARGETLOC (3 bytes) contains the Logical Sector Number (LSN) of the 
first sector of the target segment. The sector at ADRR_LOC + n is mapped onto the sector at 



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TARGETJLOC + n with n in the range from 0 to ADDRLOC (current) - ADDR_LOC 
(current) -1 

Fig. 5 shows an alternative embodiment of Reserved Space Allocation Table 
(18,26,31) comprising 3 Logical Sectors. Where appropriate similar reference numbers as in 
5 Fig. 4 are being used. Similar are a RSATJD (4 bytes) 35 and a RSAT_COUNT (2 bytes) 
36. 

New is the RSATFMTJD 44 (1 byte) for indicating the RS AT format mode 
as used by an application. 

A PREVLOC (3 bytes) 37 is again similar. 
[0 New is the END-DATA ( 3bytes) 45 which contains the Logical Sector 

Number (LSN) of the last sector containing application data that is not intended to allocated 
in the Reserved Space 19. When RSATFMTJD 44 is set to 1, END_DATA 45 indicates 
the location of the second Anchor Volume Descriptor Pointer ADVP 34 of an UDF file 
system. 

1 5 RSAT_MAPT_SA (2 bytes) 46 contains the start address of the RSAT_MAPT 

39 in bytes relative to the start address of RSAT. 

RSAT_MAPT_SZ (2 bytes) 47 contains the size of RSAT_MAPT in bytes. 
The RSAT_MAPT (2 sectors) 39 contains 1024 RSATJTEMS ( 4 bytes) 40. 
RSAT_ITEM#n contains the mapping information for the (n+l)st ECC block in the Reserved 
20 Space 19. 

MSTAT (lbit) 48 indicates the mapping status for the (n+1) st ECC block in 
the Reserved Space 19. 0b (b: binary) indicates that this ECC block is in use and lb indicates 
that this ECC block is mapped to another location. If MSTAT equals 0b, no data is recorded 
for logical sectors in the range from LSN = (n x 16) to LSN = ((n x 16) + 15). 
25 If MSTAT equals lb, data recorded for logical sectors in the range from LSN = (n x 16) to 
LSN = ((n x 16) + 15) can be found at locations indicated by ACTUAL_LOC (3 bytes) 49. 

ACTUALJLOC 49 then contains the LSN of the first sector of the ECC-block 
where the data is actually recorded. The value recorde in ACTUAL_LOC 49 shall be a 
multiple of 16. (The three least significant bits of ACTUALJLOC 49 shall always be set to 
30 000b. If MSTAT 48 equals 0b, the value recorded in ACTUAL_LOC 49 shall be OOOOOOh 
Fig. 5 shows a first example of possible use of a Reserved Space Allocation 
Table (RSAT) 18, 26, 31 in Video applications. Illustrated are the recording space 51 
according to a 'real' disc and the recording space 52 according to a 'virtual' disc to be obtain 
by mapping the 'real' disc. In this example the 'real' disc have not been finalized, so the 



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management information (VRMI 13, VMG 3, VTSI 5), the back-up therefrom (VTSI_BUP 8 
and VRMIJBUP 14) and file information (UDF 52) are recorded after the last recorded 
VTSTTVOBS 7 (corresponding to the earlier mentioned Management Data (MGT) 16. 

Further shown are the MAPJSTAT 48 and the Logical Sector Number LSN 
5 for each area. The recording space 51 corresponds to the Reserved Space 19 and reflects a 
"virtual' disc obtained by mapping the 'real' disc. The area between LSN= k and LSN=B 
should be recorded with arbitrary data after finalization. 

The corresponding table in Fig.5 shows corresponding values of MAP_STAT 
41, addressed location (ADDRESSED) and actual location (ACTUAL). MAP_STAT 41 = 

10 00b indicates mapped and not recorded, 10b indicates not mapped and not recorded and 1 lb 
indicates not mapped but recorded. 

Fig. 7 shows a second example of possible use of a Reserved Space Allocation 
Table (RSAT) 1 8, 26, 31 in Video applications when making a second recording. The 
recording space 53 corresponds to the 'real' disc and the recording space 54 to the 'virtual' 

15 disc obtained by mapping the 'real'disc. This example differs from the example given in Fig. 
6 in that the recorded area in the Temporary Overview Space (TOS) 17 is kept as small as 
possible by having the Management Data (MGT) 16 recorded mutually contiguously. Only 
when finalizing, the correct locations (A, B, C, C) are assigned with unused in between areas 
p, q, r and s within in the Reserved Space (RES) 19. 

20 Fig. 8 shows a third example of possible use of a Reserved Space Allocaton 

Table (RSAT) 18, 26, 31 when making an update of the Video Recorder Management 
Information (VRMI) 13 only. The recording space of the 'real' disc denoted by 55 and of the 
corresponding 'virtual' disc by 56. Because of the update, the previous Reserved Space 
Allocation Table (RSAT-1) 26 is not used anymore and replaced by a next Reserved Space 

25 Allocation Table (RSAT-2) 3 1 . The RS AT-2 comprises the old mapping contained in RSAT- 
1 except for the mapping of the old VRMI 26 which is replaced by a mapping for the updated 
VRMI 27. 

Fig. 9 shows an embodiment of allocation of the Reserved Space Allocation 
Tables (RSAT) 18, 26, 31. In this embodiment the area reserved for RSAT 18,26,31 consists 
30 of the last 2 or 3 recorded ECC blocks 57 of the Reserved Space 19, each containing a RSAT 
18, 26, 3 1 . Each occurrence being identical and located before the first byte of the first sector 
of each ECC block 57. All bytes not belonging to a RSAT 18,26, 31 are reserved and are set 
to an arbitrary value. 



WO 03/030173 PCT/IB02/03840 
12 

Fig. 10 shows a method of recording according to an embodiment of the 
invention, using a Reserved Allocation Table (RSAT). The method may be executed by a 
general processor executing a loaded application program. Such as for instance in case of 
stand alone disc drive coupled to a computer system. The method may also be executed by 
5 dedicated processing hardware. Such as for instance in case of a built-in disc drive in a 
recording apparatus. Also part of the functionality may be built in the drive itself. 

In a first step 58 it is determined whether a first recording is to be made on a 
blank disc of the recordable-type only. If this is the case, a drive is requested in step 59 to 
create a Reserved Space (RES) 19 at Physical Sector Number PSN=0003 OOOOh up to PSN = 
10 0003 3FF0h. In step 60 an audio/video information signal such as an MPEG-2 Program 
Stream with the audio-visual content for the first recording is written starting from address 
PSN = 0003 4000h. Recording stop at a 16-sector boundary (in view of an ECC block of 16 
sectors). The recorded stream complies with the Video Object Set for a Title 
(VTSTT_VOBS) specifications as defined in the DVD Video Data structure 12 for a DVD 
1 5 disc of the rewritable type as explained with reference to Fig.2. 

In step 6 1 all Management Data (MGT) 1 6 as required by the above- 
mentioned specifications are recorded following the recorded audio/video signal. Backup 
files for Video Title Set Information (VTSI_BUP) 5, Video Recorder Management 
Information (VRMI_BUP) 14 and the Second Anchor Volume Descriptor 34 are recorded in 
20 this order contiguously. 

Finally, in step 62 an area for a Reserved Space Allocation Table (RSAT 18, 
26, 31) is appended of, for instance 32 of 48 sectors, including 2 or 3 instances of a Reserved 
Space Allocation Table (RSAT) (18,26,3 1) with the version number set to 0. 
Fig. 3A illustrates the result after such a first recording. 
25 If, either in step 58 or step 63 is has been determined that a second or higher 

recording has to be made, then in step 64 an second audio/video information stream such as 
an MPEG-2 Program Stream is written starting from the last written address after step 62. 
The area starting at Physical Sector Number PSN = 000 3 4000h until the end of the second 
recording complies with the above-mentioned VTSTT_VOBS specifications. The previously 
30 written Management Data (MGT1) 16 and Reserved Space Allocation Table (RSAT-1) 1 8 
are fully absorbed by the new VTSTT_VOBS (27). 

Again, in step 65, all new Management Data (MGT2) 25 is recorded following 
the second recording contained in a new Video Object Set for a Title (VTSTT-VOBS#2) 27. 



WO 03/030173 PCT/IB02/03840 
13 

In step 66 a new Reserved Space Allocation Table (RSAT2) 26 is added, 
similar to step 62 with the version number increased to 1. The result is illustrated in Fig. 3B. 

In step 67 it is determined if only an update of the Management Data (MGT) 
16 has to be recorded. Is so, then in step 68 a new version of the VRMI 13, the backup 
5 VRMI-BUP 14 and if necessary, VMG 3 files is recorded. 

hi step 68 a new second AD VP 34 is recorded after, at least, the VRMI-BUP 
14. Both are not mapped by the corresponding RSAT. If necessary, part of the file system 
data is rewritten in step 69. Finally, in step 70, an additional RSAT-3 31 is added with the 
version number increased to 3. The result is shown in Fig. 3D. 
10 If no update or recording is required, it has to be determined in step 7 1 if the 

present recording session should be closed of left open (step 72). If the session is left open, 
the disc shall contain a Reserved Space (RES) 19 and a Temporary Overview Space (TOS) 
17. 

If the session should be closed, the Management Data (MGT) 16, 25, 30 is 
1 5 copied from the Temporary Overview Space (TOS) 1 7, 24, 29 to the Reserved Space (RES) 
19 in accordance with the mapping information contained in the Reserved Space Allocation 
Tables (RSAT) 18, 26, 31 in step 73. Next, in step 74, arbitrary data is recorded to all sectors 
in the Reserved Space (RES) 19 that all still unrecorded after the previous recording step. 

In step 75, the final second Anchor Volume Descriptor (ADVP) 34 is added to 
20 end of the data structures. In step 76, the Lead-in area (LI) 20 is recorded according to the 
requirements for this area. Finally, in step 77, the session is closed by recording appropriate 
closure data. In that case no more video content according to the specified DVD Video Data 
Structures for a disc of the Write Once type can be recorded., although it is still possible to 
add other data. 

25 Alternatively, the disc could be finalized by recording a Lead-Out area (21) 

instead of the above-mentioned closure data. In that case also no other data can be recorded. 

Compatibility with the DVD Video Data Structures for a DVD disc of the 
Read-Only type is only obtained when the disc has a Lead-in (LI) 20, all sessions have been 
closed and there are no blank areas between the start of the Lead-in (LI) 20 and the end of 
3 0 last closure or Lead-Out area (LO) 2 1 . 

Fig. 1 1 shows a recording device according to an embodiment of the 
invention. A recordable disc of the DVD write-once type 79 is rotated by rotational drive 
means 80 controlled by servo motor control means 81. These servo motor control means 81 



WO 03/030173 PCT/IB02/03840 
14 

further control the positioning of an optical reading/recording unit 82 for scanning the disc 79 
with a focused reading/recording laser beam 83 along a track 84. 

This unit 82 comprises laser beam generating means as well as radiation 
sensitive detectors to convert reflected radiation into electrical signals. The digital data 
5 represented by these electrical signals are stored in buffer memory means 85. Channel 

demodulation means 86 and error-correction means 87 demodulate, respectively error-correct 
the channel coded information for obtaining the user data. The user data, which in case of 
video data is compressed according to a suitable compression format such as for instance the 
MPEG2- format. The compressed user data is decompressed with decoding means 88 (eg a 
10 MPEG-2 decoder) and converted into analogue signals by AD converter means. The user 
data may alternatively be outputted digital and compressed by using suitable transcoding 
means 89. 

Reversibly, received analogue signals are converted into digital signal via DA 
converter means and subsequently MPEG-2 compressed by suitable encoding means 90, 

1 5 provided with error correction data by error correcting means 9 1 and channel encoded by 

channel modulation means 92. Also a digital compressed signals may be inputted via second 
transcoding means 100. 

The channel modulation in case of DVD discs is of the EFM+ type. 

A control unit 93 may control each unit as such as well as the cooperation 

20 between these units by control signals nor further shown in the figure. To this purpose the 
control unit comprises general processor means 94 connected with electronic memory means 
of the Read-Only type (ROM) 95 , the Random- Access type (RAM) 96 and /or the erasable 
programmable type (EPROM) 97. The processor means 94 operates according to a loaded 
computer control program, stored in the above mentioned memory means 95-97 to perform 

25 the above-mentioned method. To receive control instructions the control unit 93 is connected 
to user interface means 98 and user command means 99. 

The recording device shown with reference to Fig. 1 1 may either be a stand- 
alone recording device or may be a combination of a disc recording drive connected to 
general computer means provided with a program to perform the claimed method. 

30 Although invention has been described with reference to preferred 

embodiments thereof, it is to be understood that these are not limitative examples. Thus 
various modifications thereof may become apparent to those skilled in the art, without 
departing from the scope of the invention, as defined by the claims. For instance, although 
the invention is described with reference to an optically readable DVD disc of the Recordable 



WO 03/030173 PCT/IB02/03840 
15 

type, other types of recordable discs maybe used. The invention maybe implemented by 
means of both hardware and software, and that several 'means' may be represented by the 
same item of hardware. 

Further, the invention lies in each and every novel feature of combination of 
5 features. It is also remarked that the word 'comprising' does not exclude the presence of 
other elements or steps then listed in the claims. Any reference signs do no limit the scope of 
the claims. 



WO 03/030173 

CLAIMS 



16 



PCT/IB02/03840 



1 . Method of contiguously recording a sequence of ordered A/V information 

signals, such as video/audio information, and corresponding management information 
signals, such as video management, menu information or file information, on a disc-like 
recording medium of the write-once type, such as an optically recordable and readable disc, 
5 the recorded information complying to the requirements of ordering of such information as 
defined by a disc of the read-only type or of the rewritable type; 
characterized by : 

allocating a reserved area within a linear addressing space; 

contiguously recording the A/V information signals in a video recording area 
10 located succeeding the reserved area; 

recording corresponding management data in a temporary overview space 
succeeding the video recording area; 

generating a mapping table for mapping the recorded management data to 
address locations in the reserved area; 
1 5 recording the mapping table in the temporary overview space. 



2. Method according to claim 1, characterized by, 

contiguously recording a next sequence of A/V information signals on a next 
video recording area succeeding the previously recorded areas; 
20 - recording next corresponding management data in the next temporary 

overview space succeeding the next video recording area; 

generating a mapping table for mapping the first and the next recorded 
management data to address locations in the reserved area; 

recording the mapping table in the next temporary overview space. 

25 

3. Method according to claim 1 or 2, characterized by, 
generating updated corresponding management information signals: 

recording at least the updated management information signals in a next 
temporary overview area succeeding the previous temporary overview area; 



WO 03/030173 PCT/IB02/03840 
17 

generating an updated mapping table for mapping the updated management 
data and the remaining management data to address locations in the reserved area: 

recording the updated mapping table in the next temporary overview space. 

5 4. Method according to one of the previous claims 1 - 3, characterized by, 

copying the recorded management information signals to the reserved area in 
correspondence to the latest mapping table information; 

recording the remaining unrecorded sections of the reserved area with arbitrary 

data signals; 

10 - recording a lead-in area preceding the reserved area with data according to the 

definitions of a disc of the read-only type or of the rewritable type; 

recording a lead-out area succeeding the recorded area with data according to 
the definitions of a disc of the read-only type or of the rewritable type or with closure data for 
closing an actual video recording session. 

15 

5. Method according to claim 4, characterized by, 

recording a mapping table containing a list of mapping items containing a 
recorded address location and a corresponding target address location in the reserved area. 

20 6. Method according to claim 4, characterized by, 

Recording a mapping table containing a list of mapping locations containing to 
all corresponding target address locations in the reserved area. 

7. Method according to claim 4, characterized by, 

25 - recording a version number to each recorded mapping table. 

8 . Method according to claim 4, characterized by, 

recording the address location of the previously recorded mapping table to the 

mapping table. 

30 

9. Method according to claim 4, characterized by, recording a mapping status to 
each item indicating the item to be mapped or not. 



10. Method according to claim 4, characterized by, 



WO 03/030173 PCT/IB02/03840 

18 

recording back-up versions of the management data in the temporary overview 

space, 

generating a mapping table including back-up versions of the management 
data having a mapping status indicated that the back-up version are not mapped. 

1 1 • Method according to claim 4, characterized by, 

recording the location of a backup of a file system in the mapping table 

12. Recording device for contiguously recording a sequence of ordered A/V 

information signals, such as video/audio information, and corresponding management 
information signals, such as video management, menu information or file information, the 
recorded information complying to the requirements of ordering of such information as 
defined by a disc of the read-only type or of the rewritable type, 
the recording devive comprising : 

means for carrying and rotating a disc-like recording medium of the write- 
once type, such as an optically recordable and readable disc, 

means for scanning a focused laser beams across a track of the disc-like 
recording medium; 

means for modulating the laser beam in accordance with digital information 
signals to be recorded on the disc-like recording medium; 

means for detecting reflections of the laser beam scanning the disc-like 
recording medium and converting the reflection in digital information signals to be read; 

means for modulating received digital A/V information signals to information 
signals to be recorded; 

control means for controlling the recording and reading of the digital 
information signals; 
characterized in that, 

the control means are adapted to ; 

allocate a reserved area within a linear addressing space on the disc-like 
recording medium; 

to contiguously record record the A/V information signals in a video recording 
area located succeeding the reserved area; 

to record corresponding management data in a temporary overview space 
succeeding the video recording area; 



WO 03/030173 PCT/IB02/03840 

19 

to generate a mapping table for mapping the recorded management data to 
address locations in the reserved area; 

to record the mapping table in the temporary overview space. 

1 3 . Recording device according to claim 1 2, characterized in that, 
the control means are adapted to : 

contiguously record a next sequence of A/V information signals on a next 
video recording area succeeding the previously recorded areas; 

record next corresponding management data in the next temporary overview 
space succeeding the next video recording area; 

generate a mapping table for mapping the first and the next recorded 
management data to address locations in the reserved area; 

record the mapping table in the next temporary overview space. 

14. Recording device according to claim 12 or 13, characterized in that, the 
control means are adapted to : 

generate updated corresponding management information signals: 

record at least the updated management information signals in a next 
temporary overview area succeeding the previous temporary overview area; 

generate an updated mapping table for mapping the updated management data 
and the remaining management data to address locations in the reserved area: 

record the updated mapping table in the next temporary overview space. 

15. Recording device according to one of the previous claims 12 - 14, 
characterized in that, the control means are adapted to : 

copy the recorded management information signals to the reserved area in 
correspondence to the latest mapping table information; 

record the remaining unrecorded sections of the reserved area with arbitrary 

data signals; 

record a lead-in area preceding the reserved area with data according to the 
definitions of a disc of the read-only type or of the rewritable type; 

record a lead-out area succeeding the recorded area with data according to the 
definitions of a disc of the read-only type or of the rewritable type or with closure data for 
closing an actual video recording session. 



WO 03/030173 



20 



PCT/IB02/03840 



16. Recording device according to claim 1 5, characterized in that, the control 
means are adapted to record a mapping table containing a list of mapping items containing a 
recorded address location and a corresponding target address location in the reserved area. 

5 

17. Recording device according to claim 15, characterized in that, the control 
means are adapted to record a mapping table containing a list of mapping locations 
containing to all corresponding target address locations in the reserved area. 

10 

18. Recording device according to claim 15, characterized in that, the control 
means are adapted to record a version number to each recorded mapping table. 

19. Recording device according to claim 1 5, characterized in that, the control 

15 means are adapted to record the address location of the previously recorded mapping table to 
the mapping table. 

20 Recording device according to claim 15 , characterized in that, the control 

means are adapted to record a mapping status to each mapping item in the mapping table, the 
Z0 mapping status indicating the item to be mapped or not. 

2 1 . Recording device according to claim 1 5, characterized in that, the control 

means are adapted to : 

record back-up versions of the management data in the temporary overview 

15 space, 

generate a mapping table including back-up versions of the management data 
having a mapping status indicated that the back-up version are not mapped. 



10 



22. Recording device according to claim 15, characterized in that, the control 

means are adapted to record the location of a backup of a file system in the mapping table 



WO 03/030173 



PCT/IB02/03840 



1/11 



2 


3 

/ 




4 




4 

/ 


VOL/FS 


VMG 


VTS#1 


VTS#2 


VTS#3 | 


VTS#n 



LSN 



VMG I 


VMGM_ 
VOBS 


BUP_ 
VMSI 




VTSI 


VTSM_ 
VOBS 


VTSTT_ 
VOBS 


BUP_ 
VTSI 


I 

9 


I 

10 


I 

11 


I 

5 


I 

6 


I 

7 


\ 

8 



LSN 



FIG.1 



TITLE 1 TITLE 2 



VOL/ 






VTSI 


VTSI 


VTSI 


VTSTT 


VTSTT 




FS 


VRMI 


VMG 


#1 


#2 


#3 


VOBS # 1 


VOBS #~2 





TITLE 3 





VTSTT _ 


BUP 


BUP 


BUP_ 


BUP 






VOBS #3 


VTSI #1 


VTSI #2 


VTSI #3 


VRMI 


LSN 



FIG. 2 



WO 03/030173 



PCT/IB02/03840 



2/11 



RES 



7 vtstt 17 

| i VOBS I 



VTSTT 
VOBS#1 



22 

\ 


21 

I 


UNREC 


LO 



MGT 


MGT 


MGT 




RSAT-1 


1-1 


1-2 


1-3 





16 18 

FIG.3A 



VOBS 



7 17 V101 '- 27 18 22 21 



LI 


i ! r es! i 


VTSTT 
VOBS#1 


TOS-1 


VTSTT 
VOBS #2 


TOS-2 


UNREC 


LO 



\ ,/ 



MGT 


MGT 


MGT 




RsV-1 




MGT 


MGT 




RSAT-2 


1-1 


1-2 


1-3 






2-1 


2-2 





FIG. 3B 



WO 03/030173 



3/11 



PCT/IB02/03840 




WO 03/030173 



4/11 



PCT/IB02/03840 




WO 03/030173 



PCT/IB02/03840 



5/11 



18.26.31 

/ 



1 35 — 


RSATJD 












36 — 


RSAT _ COUNT 




41 


MAP 


REC 


37 — 


PREV_LOC 




\ 


rOO 


Y 


N 


38 — 


ITEM_N 




MAP _ STAT 






01 


Y 


Y 










39 — 


RSAT _ MAPT 


/ 42 — 


ADDR _ LOC 






10 


N 


N 


40 — 


RAST _ I TEM # n 




TARGET LOC 


f 




,1 1 


N 


Y 








i 


8 byte 










254x8 kbyte 




43 









SECTOR FIG. 4 



1 SECTOR 

'J 35 — ' 



RSATJD 



— RSAT CNT 



— RSAT_FMT_ID 



44 ; 

37: 

45 — ' 



PREV LOC 



END DATA 



RSAT MAPT SA 



47: — RSAT MAPT SZ 



RESERVED 



RSAT MAPT 



RAST _ ITEM #r^ 
1024 x 4 bytes 



2 SECTORS 



/iSTAT 



MAP 




N 


{! 


Y 



1 byte 



FIG. 5 



WO 03/030173 



PCT/IB02/03840 



6/11 

50 

? / 

) LSN — ► X ►X + k 



MAP _ STAT ► 

11b 


11b 






VOBS 


VTSI/VRMI 
BUP 


UDF 




VRMI 


VMG 




VTSI 


RSAT 




/ 

7 


/ 

8,14 


/ 

52 




/ 

13 


I 

3 




1 


8, 26,31 



51 



MAP _ STAT 



52 

\ 




13 

\ 




3 

\ 




5 

\ 




7 

\ 




UDF 




VRMI 




VMG 




VTSI 




VOBS 














00b 


10b 


11b 



LSN — ► 0 k B 



MAP _ STAT 


ADDRESSED 
(LSN) 


ACTUAL 
(LSN) 


00b 


0 


X 


10b 


k 


k 


11b 


B 


B 



FIG. 6 



WO 03/030173 



PCT/IB02/03840 



7/11 

53 

/ 



MAP 



MAP _ STAT 
















vnR c VTSI/VRMI 
VOBS BUp 


UDF 


VRMI 


VMG 


VTSI 


RSAT 




/ 

7 


' / ' /! I I 

8,4 / 52// 13 / 

/ / I 

> 52 / / 13 / 

/ 1/ ! \ 


I n 
3 / 1 
/ \ 
i \ 
i i 
i i 

3 / 1 

\ 


/ \ 

5 \ 18,26,31 

l 

\ 54 

. \f , 

i 1 \ 




P 

UDF — 


- VRMI — 


VMG — 




s 

VTSI 


- VOBS 


_ STAT — ► 


00b 10b 

) 


00b 10b 

B 


00b 10b 

: 


00b 10b | 11b 
D E 



MAP _ STAT 


ADDRESSED 
(LSN) 


ACTUAL 
(LSN) 


00b 


0 


X 


10b 


k 


k 


00b 


B 


X + k 


10b 


B + J 


B + I 


00b 


C 


X + k + l 


10b 


C + m 


C + m 


00b 


D 


X + k + l+m 


10b 


D + n 


D + n 


1 1 b 


E 


E 





FIG. 7 



WO 03/030173 



PCT/IB02/03840 



8/11 



/ 



LSN: ► 




e 


m 


n 




f 


















VOBS 


VTSI/VRMI 
BUP 


UDF 


VRMI 


VMG 


VTSI 


RSAT 
-1 


VRMI 


RSAT 
-2 



' I I 

7 8,4 / 

/ 


/ 

52 

/ 


/ ,', 


\i 

\ 
\ 


\\ 5^'\ 26/ 
A\ .<>< 


57 
5 


I 

31 




i 

/« 
' / 


/ 

/ 

/ 

/ 

/ 

/ 




V \ 


■\" 

\ 




/ 


7 




UDF 


P 


VRMI 


q 


VMG 


r 


VTSI 


s 


VOBS 


MAP _ STAT — * 


00b 


10b 


00b 


10b 


00b 


10b 


00b 


10b 


11b 


LSN-*-( 


) 




3 












E 



MAP _ STAT 


ADDRESSED 
(LSN) 


ACTUAL 
(LSN) 


00b 


0 


X 


1 Ob 


k 


k 


00b 


B 


Y 


1 Ob 


Q+l 


B+ l 


00b 


C 


X + k + l 


10b 


C + m 


C + m 


00b 


D 


X + k+ t+ n 


10b 


D + n 


D + n 


1 1 b 


E 


E 


V 



FIG. 8 



WO 03/030173 



9/11 



PCT/IB02/03840 




WO 03/030173 



PCT/IB02/03840 



10/11 




76-^. | RECORD LI | 



CLOSE SESSIOn] ^^ 77 

G?D FIG. 10 



WO 03/030173 PCT/IB02/03840 



11/11