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(12) INTERNAnON&L APPUCATION FDSLGSHED Vmm. THE SAXmt COOFERAHON TREATY (PCT) 



(19) World IntelkctaalPropeiiyOrganizatian 



(43) II 

25 January 2O01 (25.01 JOOl) 



PCT 



WO 01/06512 Al 



(51) I 

(21) International AppliotfionN 

(22) laternatioBal Filing Date: 
(25) Filing Language: 

(2^ Publication Language; 



GllB 20/18 ^1) 



12 My 2000 (12.07.2000) 



15 July 1999 (LS.Q7.1999) EP 



It ffbr all designated States except US): KONIN- 
KLUKE PHILIPS ELECTRONICS N.V. [NUNL]; 
Groenewoudseweg 1, NL-5621 BAEindlioven (NL). 

(72) Inventor; and 

(75) Inventor/AppUcant (far US only): VAN GESTEL, Wil- 
5 helmus, J. [NL/NL]; Prof. Holstlaan 6, NL-5656 AAHnd- 
" hoven (NL). 



! (74) Agent: EAESSEN, Louis, M., JEU 
s iiooibnsBan B.V., FtnL Holsflaan 6, NLr5fi56 AA anceNiOesoni 
!n(NL). 



es (national): AE, AG, AL, AM, AX, AD, 
AZ, BA, BB, BG, BR, BY, CA, CH, CN, CR, CU, CZ, DE, 
DK, DM. DZ, ^ ES, H, GB, GD, GE, GH, GM. HR, HIT, 
m. IL. m, B, JP. KE, KG, KP, KR, KZ, LC, LK, LR, LS. 
LT, LU. LV. MA, MD, MG, MK, MN. MW. MX, NO, NZ, 
HU PT, RO, RU, SD, SE, SG, SI, SK, SL, TT, TM,TR, TT, 
TZ, UA, UG, US, UZ, m YU, ZA, ZW. 

(84) Designated States (regional)'. ASIPO patent (GH, GM, 
KE, LS, MW, MZ, SD. SL, SZ, TZ, UG. ZW), Emasian 
pateDt(AM.AZ.BY,EG,KZ.MD,SU.TJ,TM).Euinpean 
patent(Ai;BE,CH,CY;iE.DK.ES,FI,ER,C».GR,IE, 
tr, LU. MC NL, PT. SE), QAEI patent (BP, BJ, CF, CG, 
a, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG). 

Publislieii: 



Before the expiration of the time limit far amending the . 
claim and to be republished in the event qf receipt of 



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^ (57) Abstract: AmeOiodisdesajbedfariiviitiiisiealtiinevi^ 

S conqidses an adndnistRttive aiea (43), a space aiea (42), ai^ a vsw atea (41). Nannal lecoiding tabes place in UoOcs (45) in a £rst 
_ p»-iesetvedai!eaatW)of afieepart(47)af fl»iiseratea(41). If duiing4faeim)idingptocess.adefisctivel(lock(45*)isencaim^ 
Q aiqpiacxsmieatiecotdingluvinstiiesizeof apb^^ of tbe 

^ user aiea (41), eSet wJucii notmaliecqrdisg conAiDes m the jSistpre^ieseived area (NW). On Hie oneliand, this limits tbe nuniber of 
^ jun^ for K^dUKCim^iecocding and. on tbe ofter Iiand, it lesuUs in the stacage cs^ad^ of tbe disc (2) being used veiy effidendy. 



wo 01/06512 
Metiiod of and device for recording information 



PCT/EPOO/06625 



The present inveodon generally relates to the recording of information, 
particularly digital infonnatiQn, on a disc-shaped recording medium such as an optical disc or 
a magnetic disc, hereinafter also referred to as "recording disc ". As is well-known, such a 
recording disc has a multitude of concentric substantially circular recording tracks. Such 
5 recording tracks nmy take the form of individual drcular tracks or of one continuous spiral 
tracL Eadi track is divided into logic blocks and each block has a data area for the recording 
of data. Furfhemiore, each block usually has an area reserved- for the recording of a check 
number or "check sum". 

In general, the amount of information to be recorded in a recording session is 
10 greater than one block. The information to be recorded, also referred as "file", is then divided 
into successive data packets having the size of one block, and the successive data packets of a 
-file ate recorded in different blocks of the disc. For a rapid data transfer it is then desirable that 
the successive data packets are recorded in successive blocks. The recording process can then 
proceed virtually continuously. Likewise, during the subsequent reading (playback) of the 
15 information recorded on the disc the read process can proceed continuously. 

In practice, a disc may exhibit defective blocks, i.e. blocks where a faultless 
recording of information is no longer possible or where any resulting small write errors can no 
longer be corrected during reading. Such a block is then no longer suited for recording. It is 
customary to reserve a spare area on the recording disc, which area cannot be addressed by the 
20 user and is intended for replacement of any defective blocks. When during recording a 

defective block is found, recording is effected in a block of the spare recording area instead of 
in the defective block. 

After recording of a data packet in a block of the spare recording area the 
recording of the foUowmg data packets is continued in a block followii^ the defective block. 
25 . Therefore, such a replacement requires two jumps of tiie recording head and likewise two 
jumps of the read head are required to read the information. 

These jumps of the read or write head from the normal recording area to the 
spare recording area and back take comparatively much time and reduce tiie average 
transmission speed of the iufonnation. This is particularly undesirable in situations in which a 



wo 01/06512 2 PCT/EPOO/O60S 

very hi^ transmission, speed is required, as for example in a real time recording of audio 
and/or video signals. 

For such iises it is proposed not to make the jumps to spare recording area and 
back for each individual damaged blodc but, when a defectiw block is found, to record a file 
5 portion comprising a plurality of blocks in the spare area. The jumps now do not occur directly 
after one ano&er in time but the time between them is longa. The transmission speed 
averaged over a time interval which does not include both junqjs is then higher. However, a 
consequence is Ihen that the spare recording area is filled rapidly, a substantial number of the 
data packets recorded in the spare recording area then wrongfully occupying space in the spare 

1 0 recording area because the blocks correspondmg to Haese data packets in the normal recording 
area are not defective. Thus, a reduction of the number of junrps is attended by a 
comparatively inefficient use of the spare recording area and the spare recording area is filled 
more n^idly; once the spare recording area is full the disc can jso longer be.used for further 
recording. Conversely, tins means that the number of file portions for which a replacement 

1 5 recording is made ia ibe spare area is comparatively small. 

It is an object of the present invention to provide a solution for the afore- 
mrationed problems. 

In accordance with an important aspect of the present invention the replacement 

20 recording is effected in a free recording area, i.e. a freely accessible addressable area which 
has not yet been used. This area is large enou^ to record file portions having a length of 
hundreds of blocks in succession. Prior to the recording the allocation manager reserves a 
certain portion of the free recording area as a replacement area. This reservation implies, on 
the one hand, that the allocation manager will not use the addresses in this reserved portion of 

25 the free recording area for recording. If during recording a defective block is found the write 
head jumps to a suitable address in the reserved replacement zone of the free recording area, 
for example the first free address in the replacement zone, and a replacement recording is 
made in said replacement zone. After recorduig of a file portion in this replacement zone the 
write head returns to the normal recording area. 

30 Upon completion of the recordmg session the allocation manager is informed 

which addresses in the replacement zone have been used for replacement and which 
replacement addresses correspond to which orijginal addresses. The allocation manager then 
knows which addresses of tiie free area are no longer free and which of the originally allocated 
addresses have not been used and are therefore, m fact, still fi:ee. 



WO01/D6512 3 FCT/EPO0/O662S 

At option, tiiis infbimation may already be transferred to Ihe allocation manager 
durii^ the lecording session, as a result of which, if this is necessary, the allocation manager 
can reserve additional space in ^ normally accessible space during tie recording process, for 
exanq>le when a very large number of errors occurs. 

5 

These and olher aspects, features and advantages of the present invention will 
be eluddaled fiirfher by means of the following description of a preferred ranbocMment of the 
invention with refeiaice to the drawings, in which: 

Figure 1 is a block diagram which shows a part of a recording ^patatus; 
10 Figure 2 diagrammatically shows the logic structure of a recording disc in order 

to illustrate a conventional recording method; and 

Figure 3 diagrammatically shows the logic structure of a recording disc in order 
to illustrate a recording method in accordance witbi the present invention. 

15 Figure 1 shows a block diagram of a part of a recording ^paratus 1 suitable for 

recording real-time video or audio signals S on a recording disc 2. 

It will be evident to one skilled in the art that the scope of the present invention 
is not limited to the racamples described hereinbefore but that that various changes and 
modifications thereto are possible without departing from the scope of the invention as defined 

20 in the appended Claims. For example, the present invention is already advantageous if only 
■ predetermined test tracks are examined in tiie test procedure, even if the test procedure is not 
• basedontheuseofthetrackingsigDai, although this is preferred. The disc 2 may be a 
magnetic disc birt the present invention is intended particularly for optical recording. The disc 
2 has a multitude of mutually concentric recording tracks 3, which are assumed to be 

25 individual circular tracks hereinafter but it is likewise possible that the tracks 3 represent one 
continuous spiral track. As is known per se, the apparatus 1 has an optical write/read head 10 
and a turntable, which is not shown for the sake of sunplicity and which faces the head 1 0, on 
wiiich turntable tbe disc 2 can be positioned and by means of which the disc 2 can be given a 
rotational movement with respect to the head 10, thus enabling a track 3 to be scanned by the 

'30 head 10. The recording apparatus 1 flirther includes means, which are known per se and whidi 
are not shown for the sake of sunplicity, for moving the head 1 0 in a radial direction of the 
disc 2, thus enabling different tracks 3 of the disc 2 to be accessed by the head 10. As is well- 
known, mformation is written in the track 3 by means of a laser beam 1 1 from the head 10. 



WO01/0«12 4 PCT/EPO0yO662S 

The write process is controlled by a fiinctional unit 20, referred to hereinafter as 
the write control Bnit Sudi a write control unit 20 is known per se and is therefore not 
described any further. It is to be noted merely that the write codIfoI unit 20 is adapted to 
control the positioning of the head 10 with respect to the disc 2 in such a manner that the write 
S process takes place at a desired location on tbie disc 2 through control of said turntable for the 
disc 2 and said positioning means for &e write head 10. Furthermore, the write control unit 20 
control the intensity of the laser beam 1 1 in dependence on the input signal S to be recorded. 
This control function of the write control unit 20 is represented diagrammalically as the 
coupling 22 in Figure 1 . 

1 0 The recording apparatus 1 further has a functional unit 30, hereinafter termed 

the allocation manager. Such an allocation manager 30 is know per se and is therefore not 
described any further. It is to be noted merely that the allocation manager 30 is adapted to 
determine on which part of the disc 2 a certain recording session or recording is to take place. 
When a user starts a recording the allocation manner 30 determines whether there is enough 

1 5 space for the recording on the relevant disc 2, and if this is the case, where this space is 

available. The allocation manager 30 informs the write control unit 20 of the starting location 
of this available space, which is represented diagrammaticaliy as the signal couplmg 31. 

Figure 2 diagrammaticaliy represents the logic structure of the disc 2, The 
recording tracks 3 together define a recordable area 40 of the disc 2, which is shown as a 

20 continuous strip and which will also be referred to hereinafter as the recording area. 

The recording area 40 of the disc 2 has been divided into logic blocks 45, which 
each have an individual predetermined address. The value of the relevant address of a block 45 
has been recorded in a predetermined address field of the block 45. It is thus possible to record 
information directly at a given location which corresponds to a given address on the disc 2 and 

25 it is likewise possible to read the information directly from a given location which corresponds 
to a given address. The blocks 45 have a block size which needs not be equal for all the 
blocks. The amount of data that can be written in one block is termed a data packet. 

The recording area 40 consists for a substantial part of a so-called addressable 
space 4 1 , which can be accessed by a user in order to record information, 'm the present 

30 example digitized video signals. This addressable space 41 will tiierefore also be referred to 
hereinafter as the user area. 

The recording area 40 of the disc 2 fiirther includes a spare area 42, which is not 
addressable and which is used as a replacement area. The relative storage capacities of the user 



wo 01/06512 g PCT/EPOO/06625 

area 41 and tiie spare area 42 are not shown to scale in Figure 2: in general, the size of the 
spare area 42 is only a few per cent of the size of the user area'41. 

Ilie disc 2 further has a predetermined area 43 wMdi stores in&rmation 
relating to the contents of the <^c. This information may relate to, for example, the number of 
5 files on the disc 2, the start addresses of the files, the lengths of the files, the names of the files 
etc. This area 43 will also be referred to hereinafter as the administrative area. 

In Figure 2 files bear the references fl, f2, f3 etc. In g^oeral, files occupy a 
plurality of blocks 45, so that a file comprises a plurality of data packets. The part of the user 
area 41 which has aheady been used for file stor^e will be referred to as occupied user area 

10 46 or occt^ied space. The non-used part of the user area 41 is still fiee: this part will be 
referred to hereinafter as the flee user area or fise space 47. The blocks widch are used by a 
file do not necessarily adjoin one another directly in the addressable area 41. The file may 
comprise a plurality of segments, which, may eadi comprise a plurality of blocks, whidi 
segments may be scattered within the addressable area 41 . The free space tha:efore consists of 

IS a plurality of segments with blocks that have not yet been used. These addresses are kept in 
-die admioistrative space 43 . For the sake of simplicity the files are represented as a smgle 
continuous area. 

When the disc 2 is loaded into recording apparatus the allocation manager 30 
instructs the write control unit 20, via the coupling 31, to read the administrative area 43 and 

20 to transfer the information thus read to the allocation manager 30 via the coupling 3 1 . The 
allocation manager 30 stores the read information in an associated memory 32. The allocation 
manager 30 now knows which part of the user area 41 of the disc 2 is occupied by prior 
recordings of files fl, £2 etc, and is consequently occupied user area 46 or occupied space. As 
a consequence, the allocation manager 30 also knows which part of the user area 41 is still free 

25 and is consequently fiee user area or fi'ee space 47. 

When the allocation manager 30 receives a new write command the allocation 
manager 30 checks in the associated memory 32 which part of the user area 41 is free space 
and sends a start address and an end address in this free space to the write control unit 20 via 
the communication line 3 1 . The allocation manager 30 also stores this data in the memory 32 

30 as an indication that the portion of the user area 41 defined by said start address and end 

address no longer belongs to the fiiee user area 47 but to the occupied user area 46. The write 
control unit 20 controls the recording process for the incoming signal S to be recorded, which 
is effected in a customary manner, starting at said start address received from the allocation 
manager 30. When the recording process has been completed the write control unit 20 reports 



wo 01/06512 g PCT/EPOO/06625 

this to tbe allocation manager 30 via the commimicsation line 3 1, after which the allocation 
manager 30 instructs the write control unit 20 to update the data in the administrative area 43 
ofthedisc2. 

The user area 41 may contain defective blocks 45*. It is then possible that the 
5 presence of certain defective blocks 45* is not known in advance to the allocation manager 30, 
as a result of which, these defective blocks 45 * are normally used for aliocatioii. However, it is 
also possible that prior to recording the allocation manager 30 knows which blocks are 
unusable as a result of the presence of defects. In the conventional manner Ihese blocks 45* 
are sifill used for allocation. The write control unit 20 is assumed to select an alternative 

10 location by itself. If during &e write process the write head 10 then reaches a defective Uock 
45*, the write control unit 20 should move the write head 1 0 to an alternative block and the 
data packet which should have been written in the relevant defective block 45* is recorded in 
said alternative block. After recording of the data packet in the alternative block the write 
■control unit 20 directs the write head 10 back to the user area 41 in tiie conventional manner. 

1 5 Such an alternative block is also termed a replaconent block 45' and the 

recording of <he data packet in a replacement blodc 45' is also referred to as a replacement 
recording. 

Conventionally, an alternative block 45' is selected in the spare area 42. 
Owing to the to and fro movement of the write head 1 0 much time is lost, as a 

20 result of which such a conventional write process is not very suitable for flie processing of real 
time video signals. The present invention proposes to reduce the number of jump movements 
of write head 1 0 and to increase the time between successive jump movements in that, when 
the write head 10 reaches a defective block 45* and it is consequently necessary to jump to a 
replacement block 45', the replacement recording is effected not just for the single data packet 

25 to be written into the defective block but in that prior to jumping back also a large number of 
subsequent data packets are written iato the replacement blocks 45*. The number of 
subsequent data packets thus written into the replacement blocks 45' can be 1 00 or more. As a 
matter of feet, errors often occur in clusters. By taking a larger number of data packets the 
mmiber of jumps is reduced. Such a sequence of successive data packets written into 

30 rq)lacement blocks 45' is also termed a file portion. 

The predefined reserve area 42 is comparatively small. In particular, this spare 
area 42 has been designed for a capacity of approximately 3 % of the overall disc capacity, 
thus providing an alternative write capability for all the defective blocks 45* if not more than 
3 % of the blocks are defective. In the conventional write process tiiis is amply sufficient in 



WO01/0«12 7 PCT/EPOO/06625 

practice because in ibat case only a single Feplacenieat blod:: 45' in the spare area 42 is utilized 
for each defective block 45* in the user area 41 . However, if file portions having a size of 100 
or more data packets are writt^ in tiie spare area 42 at the same time, it is inevitable that also 
a large number of replacement blocks 45' of the spare area 42 are required as an alternative 
5 recording area for non-defective blocks 45 of the user area 41. This means that the spate area 
42 is filled n^idly and may already be Ml ev^ when the number of defecdve blocks 4S* in 

user area41 is much smaller than 3 %. When the spare area 42 is flilltfae disc 2 can no 
longer be used for fiirfher recordmg. 

The present invention also provides a solution for this problem. 

10 For this purpose, in accordance wiOi the present invention, the allocation 

manager 30 is adapted to reserve two different areas in the fi:ee user area for recording, a first 
area being reserved for normal recording and a second area being lesarved for replacement 
recording. The allocation manager 30 informs the write control unit 20 about these areas. The 
write control unit 20 is adapted to perform a normal recording in the first area and, vAiesL 

15 defective blocks 45* are found, to perform a replacement recording for a file portion in the 
second area. 

As illustrated in Figure 3, the allocation manager 30 can, for this ptupose, be 
adapted to specify a write start address WSA and a write end address WEA in the free user 
area 47, which addresses reserve an areaNW for normal recording, and to specify also a 

20 replacement start address RS A and a replacement end address REA in the free user area 47, 
which addresses reserve an area RW for replacement recording. Figure 3 shows that the area 
NW reserved for normal recording is situated at the begiiming of the free user area 47 and the 
area RW reserved for replacement recording is situated at the ead of the free user area 47. In 
reality, the free user area will comprise a plurality of non-adjoining areas scattered over the 

25 entire addressable space. Therefore, it is also possible that the area RW reserved for 
rq)lacement recording adjoins &e area NW reserved for normal recording. 

The allocation manager 30 is adapted to communicate these addresses to the 
write control unit 20, which ia its turn is adapted to enswe that the recording of tbte 
information stream in the area NW reserved for normal recording within the' free user area 47 

30 proceeds in the conventional maimer. However, the write control unit 20 is adapted to ensure 
that, when a defective sector 45* is found, the write head 10 jumps to a location in the 
replacement zoiie RW within the free user are 47, to effect a replacement recording of a file 
portion at said location, and subsequently to cause the write head 10 to jump back to the area 
NW reserved for normal recording withm the free user area 47. It will be evident that in this 



wo 01/06512 g PCT/EPOO/06625 

way replacemeut recording is effected without the drawbacks described hereinbefore. Thus, in 
particular, the spare area 42 is not utilized. 

As is customary, the write control unit 20 reports to the allocation manager 30 
when the recording process has. finished, vspon which the allocation manager 30 instructs the 
5 write control unit 20 to update the data in the administrative area 43 of the disc 2. The 

allocation manager 30 adds the addresses in the area RW reserved for replacement recording 
to said admimstratiye data in the administcative area 43. The non-used addresses vnth. the 
defects are left in ^ fiee user area. It is possible to add these addresses to the list of non- 
reliable addresses. During a subsequent recording the allocation manager 30 could then decide 
10 not to use these addresses for allocation. This precludes a loss of time during re-allocation. 

Thus, the occupied space 46 of the uss area 41 now compiises a part 46W 
occi^ied by normal recording, the blocks akeady used in the area NW, and the blocks already 
used in the area RW. The allocation manager 30 writes this into the m^ory 32 and, upon 
completion of the recording session, it records the information in the table of contents in the 
15 administratiYeaiea43 onthedisc. 

When the disc 2 is loaded into Hie apparatus 1 a next time a similar procedure is 
carried out: the allocation manager 30 recognizes the addresses that have been used. From this 
information it can derive what free user area is left. A part of this area is reserved for 
replacement recording. This need not be the same part as during a previous recording. 
20 Normally, the size of the replacement zone RW in the free user area 47 is largra 

than that of the spare area 42 and large enou^ to handle the number of replacement 
recordings which occurs under normal conditions. 

If during recording the residual free user space becomes small because the disc 
is getting Ml, while there is still room in the replacement space, the allocation manager 30 can 
25 reduce tibe replacement space by informing the write control unit 20 of this. In this way, the 
whole disc can be used for storage. It is possible that during the recording session the write 
control unit 20 also supplies iofonnation to the allocation manager 30 about the size of the 
. residual non-used part of the replacement zone RW, as a result of which, if the number of 
replacement recordings is comparatively large and tiie replacement zone is therefore about to 
30 become full even before the recordmg session has been completed, the allosiation manager 30 
can extend the replacement zone RW. 

Once a part of tiie free user area 47 has been reserved by the allocation manager 
30 the allocation manager 30 will no longer consider this part as bemg freely available for 
normal recording. 



WO01/0«12 g PCT/EPOO/06625 

The method proposed, by the present invention has some major advantages. 
During the recording session or recording process the size of Hbe replacement area in the ftee 
space can be changed dynamically. This does not give rise to any loss of playing time as a 
result of the reserved leplacotn^t area. Moreover, the disc can still be used, even yfbsa more 
5 than 3 % of the recordng area is defective. Theoretically, the disc can evm be used when 
nearly 100 % of the storage space is defective but the residual plajdng time decreases 
according as more storage space is defective and more replacement space is required (gracefid 
degradation). This is in contradistinction to the conventional method, where a disc is no longer 
usable when more iSam 3 % of defects occurs. 

1 0 Thus, in summary, the present invention in particular provides a method of 

recording real time video signals on a DVR disc having a recording area 40 which includes an 
administrative area 43, a spare area 42, and a user area 41. Normal recording is efifected in 
blocks 45 in a first pre-reserved zone NW of a free part 47 of the user area. If a defective block 
45* is encountered during the recording process a replacemaat recordn^ of a file portion 

1 5 having the size of a plurality of blocks is made m a second pre-reserved zone RW of Ihe free 
part 47 of the user area, after which normal recording is continued in the first pre-reserved 
zone NW. On the one hand, this reduces the number of jumps and limits the number of jumps 
occurring within a short period of time for the purpose of replacement recording and, on the 
other hand, a very efEcient use is made of the storage capacity of the disc. 

20 It will be evident to one skilled in the art that the scope of the present invention 

is not limited to the examples desaibed hereinbefore but that that various changes and 
modifications thereto are possible withoirt. departing &om the scope of the invention as defined 
in the appended Claims. 



wo 01/06512 



CLAIMS: 



10 



PCT/EPO0/O662S 



1 . A method of recording information, particularly real time video or audio, on a 
recording disc (2) of the type having a multitude of concentric substantially circular recording 
tracks (3) divided into blocks (45), particularly an optical disc, which recording tracks (3) 
together define a recording area (40) of the disc (2), which recording area (40) includes at least 

5 a freely accessible addressable user area (41); 

wherein the information to be recorded is divided into data packets having the size of a block, 
wherein successive data packets are recoided in different blocks (45) of said user area (41); 
and 

wherein, if a block (45*) appears to be defective, a replacement recording for the relevant data 
1 0 packet is effected in anoflier part of said user area (41 ). 

2. A method as claimed in Claim 1 , wherein, prior to the recording session, a 
given part (RW) of said fredy accessible addressable user area (41 ) is reserved as a 
replacement zone. 

15 

3. A method as claimed in Claim 1 or 2, wherein, during the recording session, an 
extra part of said freely accessible addressable user area (41) is reserved as a replacement 
zone, if necessary. 

20 4. A method as claimed in any one of the Claims 1-3, wherein, during the 

recording session, the reservation of a part of the previously reserved replacement zone is 
cancelled, if necessary, in order to make said part available agam as a free user area (47), 

5. A method as claimed in aiiy one of the Claims 1-4, wherein, if a defective block 
25 (45*) is encountered during the recording process, a replacement recording is made for a file 

portion comprising a plurality of successive data packets. . 

6. A recording apparatus (1) adapted to carry out a method as claimed in any one 
of the Claims 1-5. 



WO01/06S12 



11 



PCr/EFO0/V6625 



7 A recording aoparatus as claimed in Claim 6, compnszngr 

a vwite control unit (20) adapted to control liie write process, and an allocation manager (30) 
ade^ted to determine at wMch location of a disc (1) a write opscation is to be efifected; 
5 wherein the allocation manager (30) is adapted to reserve two different areas for recording in a 
fiee part (47) of the user area, a first area (NW) being reserved for normal recording and a 
second area (RW) being reserved for replacement recording; 

the allocation manager (30) being adapted to inform the write control mut (20) about these 
reserved areas (20); 

10 the write control unit (20) being adapted to effect the normal recording in the first pre-defined 
area (NTW) and, if defective blocks (45*) are encountered, time interval effect a replacement 
recording for a file portion having the size of a plurality of blocks in the second pre-defined 
area (RW) and, i5>on completion of the replacement recording, to proceed vrifh normal 
recording in the first pre-defined area (NW)- 

15 

8 . A recording apparatus as claimed in Claim 7, wherein the write control unit 
(20) is adapted to inform the allocation manager (30), upon completion of a recording process, 
of the addresses used in the second pre-defmed area (RW), and 

wherein the allocation manager (30) is adapted to enter said addresses used in the second pre- 
20 defined area (RW) into a memory (32) associated with the allocation manager (30) and into a 
table of contents in an administrative area (43) of the recording area (40) of the disc (1). 

9. A recording apparatus as claimed in Claim 7 or 8, wherein the allocation 
manager (30) is adapted to include the address of the defective block (45*) having led to the 

25 replacement recording in a list of unreliable blocks, and to inhibit the use of the blocks 
included in said list for allocation when said two areas (NW ; RW) are reserved upon a 
subsequent recording cominand. 



1/1 



PCmP00/0«625 



I — 



FIG.1 





46 47 








1 « 






42 1 



FIG. 2 





46 W 


47 






i i wz 










1 RW 


i • 1 


t ! 1 


1 



WSA WEA 



RSA REA 



FIG. 3 



INTERNATIONAL SEARCH REPORT 



PCT/EP 00/06625 



al Patent ClassTicalion QPC) orto both na 



i;PC 7 GllB 



EPO-Internal , WPI Data 



C. IXXiUMENTS CONSIDEBEO TO BE HELEVANT 



Category ' Citation of document wil 



EP 1 014 365 A (SAMSUNG ELECTRONICS CO 

LTD) 28 June 2000 (2000-06-28) 

page 4, line 43 -page 5, line 49 

page 6, line 19 -page 8, line 42 

EP 0 798 716 A (TOKYO SHIBAURA ELECTRIC 
CO) 1 October 1997 (1997-10-01) 
column 15, line 11 - line 29 

EP 0 798 710 A (TOKYO SHIBAURA ELECTRIC 
CO) 1 October 1997 {1997-10-01) 
page 5, line 33 - line 36; figures 5,7 
page 9, column 36 -page 13, column 52 

EP 0 569 045 A (MATSUSHITA ELECTRIC IND CO 
LTD) 10 November 1993 (1993-11-10) 
column 5, line 40 -column 6, line 28; 
figure 7 

-/-- 



1-3,5 
5,7 



1*6,7 
2-5,8,9 



Furttier documents are listed In tlie rantinuatlcm of box Cl 



m 



Patent famly menibers ate Rsled In an 



:' eaiTier document titnpuOBslted on or alter tlie 



■ document puWistied prior 

laterthan the priority date daimed 




docaitientlsco 
mens, such comlUnallaii being obvious to 
fnlhaan. 

'&' doiaiirent member of the same patent tamily 



DateotUieactiiatco 



11 Deceit4)er 2000 



18/12/2000 



European Patent Office. P.a 5818 Patenllaan 2 
t<L-a280HVraisw«k ■ 
Tel (431-70) 340-aMO. 14. 31 651 epo nl. 



page 1 of 2 



INTERNATIONAL SEARCH REPORT 



PCT/EP 00/066Z5 



C.(Contlnuation) DOCUMENTS CONSIDERED TO BE RELEVANT 



Category ■> Citalton of document, with indication.where appioprtale, of the relevant passages 



GB 2 332 555 A (MITSUBISHI ELECTRIC CORP) 

23 June 1999 (1999-06-23) 

page 15, paragraph 1 - paragraph 3 



US 5 844 911 A (BEHRENS RICHARD T 
1 December 1998 (1998-12-01) 
column 3, line 8 - line 33 



ET AL) 



page 2 of 2 



INTERNATIONAL SEARCH REPORT 

inrormatlon on patent family members 



Inteir ial Application No 

PCT/EP 00/05625 



CN 1257274 A 
JP 2000276838 A 
BR 9905358 A 



21-06-2000 
06-10-2000 
12-09-2000 



JP 9259547 A 03-10-1997 

CN 1154731 A 12-11-1997 

DE 69700222 D 24-06-1999 

DE 69700222 T 25-11-1999 

US 5991253 A 23-11-1999 

US 5883867 A 16-03-1999 



EP 0798710 A 01-10-1997 OP 9259537 A 03-10-1997 

US 5914928 A 22-06-1999 



DE 68922045 D 11-05-1995 

DE 68922045 T 03-08-1995 

DE 68923568 D 24-08-1995 

DE 68923568 T 25-01-1996 

EP 0357049 A 07-03-1990 

JP 2139768 A 29-05-1990 



GB 2332555 A 


23-06-1999 


JP 11185390 A 


09-07-1999 






DE 19859529 A 


01-07-1999 


US 5844911 A 


01-12-1998 


NONE