KR100696794B1 - Defect managing method for a rewritable optical disc - Google Patents

Defect managing method for a rewritable optical disc Download PDF

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KR100696794B1
KR100696794B1 KR1020000016348A KR20000016348A KR100696794B1 KR 100696794 B1 KR100696794 B1 KR 100696794B1 KR 1020000016348 A KR1020000016348 A KR 1020000016348A KR 20000016348 A KR20000016348 A KR 20000016348A KR 100696794 B1 KR100696794 B1 KR 100696794B1
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sector
disc
area
defect
data
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KR20010095387A (en
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최광수
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엘지전자 주식회사
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10Digital recording or reproducing
    • G11B20/18Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1883Methods for assignment of alternate areas for defective areas
    • G11B20/1889Methods for assignment of alternate areas for defective areas with discs
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10Digital recording or reproducing
    • G11B20/18Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1883Methods for assignment of alternate areas for defective areas
    • G11B2020/1893Methods for assignment of alternate areas for defective areas using linear replacement to relocate data from a defective block to a non-contiguous spare area, e.g. with a secondary defect list [SDL]
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10Digital recording or reproducing
    • G11B20/18Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1883Methods for assignment of alternate areas for defective areas
    • G11B2020/1896Methods for assignment of alternate areas for defective areas using skip or slip replacement to relocate data from a defective block to the next usable block, e.g. with a primary defect list [PDL]

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  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

본 발명은 재기록 가능 디스크에 있어, 디스크의 이용효율성을 높이는 결함 관리 방법을 제공하는 데 그 목적이 있다.SUMMARY OF THE INVENTION An object of the present invention is to provide a defect management method for improving the utilization efficiency of a disc in a rewritable disc.

위 목적을 달성하기 위하여, 본 발명에 따른 재기록 가능 디스크의 결함관리 방법에 있어서, 디스크의 일정단위로 구획된 존(zone)내에서 결함섹터가 발견되는 경우 해당 존의 마지막 위치부터 결함섹터의 대체섹터로서 순차 교체기록하는 단계와; 결함섹터와 대체섹터의 위치 정보를 디스크의 결함관리영역에 기록하는 단계로 이루어지는 것을 특징으로 한다.In order to achieve the above object, in the defect management method of a rewritable disc according to the present invention, when a defect sector is found in a zone partitioned by a predetermined unit of the disc, replacement of the defective sector from the last position of the zone is performed. Sequential replacement recording as a sector; And recording the position information of the defective sector and the replacement sector in the defect management area of the disc.

본 발명에 의하면, 결함이 생긴 만큼만 대체영역으로 사용하기 때문에 디스크 전체의 영역을 효율적으로 사용할 수 있는 것이다.According to the present invention, since only the defect is used as the replacement area, the entire area of the disc can be used efficiently.

광디스크, 결함 관리Optical Disc, Defect Management

Description

재기록 가능한 광디스크의 결함 관리 방법 { Defect managing method for a rewritable optical disc }Defect management method for a rewritable optical disc

도 1은 재기록 가능 디스크의 데이터 구조도,1 is a data structure diagram of a rewritable disc;

도 2는 슬리핑방식에 따른 데이터 기록예를 보인 도면,2 is a diagram showing an example of data recording according to a sleeping method;

도 3은 종래의 교체 방식에 의한 데이터 기록예를 보인 도면3 shows an example of data recording by a conventional replacement method;

도 4는 본 발명에 따른 디스크의 사용자 영역의 구조도,4 is a structural diagram of a user area of a disc according to the present invention;

도 5는 본 발명에 따른 결함관리 방법에 의한 데이터 기록예를 보인 도면,5 is a view showing an example of data recording by the defect management method according to the present invention;

도 6은 본 발명에 따른 결함관리 방법에 의한 인접존(zone)간의 데이터 구조를 보인 도면.6 is a view showing a data structure between adjacent zones by the defect management method according to the present invention.

본 발명은 재기록 가능한(Rewritable) 광디스크에 있어 결함을 관리하는 방법에 관한 것이다.The present invention relates to a method of managing a defect in a rewritable optical disc.

디지털 정보 저장매체로서 광디스크는 상용화된 CD(Compact Disc)를 비롯하여 CD에 비하여 대용량의 정보가 저장되는 DVD(Digital Versatile Disc)등이 개발 및 보급되고 있다. 이러한 광디스크들은 기록가능 여부에 따라 재생전용의 ROM( Read Only Memory) 디스크(예: CD-ROM, DVD-ROM)와, 1회 기록 가능한 WORM(Write Once Read Many) 타입(예: CD-R, DVD-R), 그리고 재기록가능한 타입(CD-RW, DVD-RAM)으로 분류할 수 있다.As a digital information storage medium, optical discs, such as commercially available CDs (Compact Discs), and DVDs (Digital Versatile Discs) in which a large amount of information is stored are compared to CDs. These optical discs are read-only memory (ROM) discs (eg CD-ROM, DVD-ROM) for playback only and write once read many (WORM) type (eg CD-R, DVD-R) and rewritable types (CD-RW, DVD-RAM).

DVD-RAM(DVD-Random Access Memory)와 같은 재기록 가능(Rewritable) 디스크에 있어서는 디스크 제조시, 기록 또는 재생시 발생하는 결함을 관리하기 위한 소위, 결함관리(Defect Management)를 하고 있다. 이를 도 1 내지 도 3을 참조하여 설명하면 다음과 같다. 도 1은 디스크의 데이타 구조를 나타낸 도면으로 디스크의 내주측으로부터 각종 관리데이터가 기록되는 리드-인 영역(lead-in area), 반경방향으로 다수의 존(zone)으로 구획된 사용자 영역(user area), 리드-아웃 영역(lead-out area)이 존재한다. In a rewritable disc such as a DVD-Random Access Memory (DVD-RAM), there is a so-called defect management for managing defects that occur during disc manufacturing, recording or playback. This will be described with reference to FIGS. 1 to 3 as follows. 1 shows a data structure of a disc, a lead-in area in which various management data is recorded from an inner circumferential side of the disc, and a user area divided into a plurality of zones in the radial direction. ), There is a lead-out area.

리드-인 영역에는 결함관리를 위한 결함관리영역(DMA: Defect Management Area)이 포함되어 있다. 즉, 도 1에서 DMA1, DMA2로 나타낸 부분이며, DMA2는 DMA1과 동일한 내용이 포함되어 있으며, 이는 DMA내의 데이터 오류를 판단하기 위해 복수로 둔 것이다. 리드-아웃 영역에도 이와 동일한 내용의 영역을 두기도 한다(DMA3, DMA4). Control Area는 기타의 관리데이터가 포함되는 영역이다.The lead-in area includes a defect management area (DMA) for defect management. That is, in FIG. 1, parts indicated by DMA1 and DMA2, and DMA2 includes the same contents as DMA1, which are provided in plural to determine data errors in the DMA. In the lead-out area, the same content area is also provided (DMA3, DMA4). The control area is an area that contains other management data.

이러한 결함관리영역에는 1차 결함리스트(PDL; Primay Defect List)와 2차 결함리스트(SDL; Secondary Defect List)가 존재하는 데, 1차결함 리스크는 검증(Certification)시 발생하는 결함을 관리하고, 2차 결함 리스트는 데이터 기록시 발생하는 결함을 관리한다. DDS(Disc Definition Structure)는 이러한 1차, 2차 결함관리 영역의 갱신횟수 등 관련되는 관리정보를 포함한다. 이러한 결함관리 영 역들이 어떻게 이용되는 지를 아래에 설명한다.In this defect management area, a primary defect list (PDL) and a secondary defect list (SDL) exist. The primary defect risk manages defects generated during certification. The secondary defect list manages defects that occur during data recording. The Disc Definition Structure (DDS) includes management information related to the update frequency of the primary and secondary defect management areas. How these defect management areas are used is described below.

도 2는 소위, 슬리핑(Slipping)방식을 모식적으로 나타낸 것으로 검증(Certification) 등을 수행할 때, 특정 섹터(기록 단위)가 결함으로 판정된 경우, 해당 섹터에 데이터를 기록하지 않고 다음 섹터에 기록하는 경우이다. 즉, 도 2는 빗금친 섹터가 결함이 있어, 이를 건너 뛰고 기록한 경우를 예시한 것이다. 이 때 전술한 1차 결함리스트(PDL)에 해당 섹터가 결함이 있음을 그 위치정보로서 기록한다.FIG. 2 schematically shows a so-called slipping method. When performing a verification or the like, when a specific sector (recording unit) is determined to be defective, FIG. 2 does not record data in the corresponding sector but moves to the next sector. This is the case. That is, FIG. 2 exemplifies a case in which the hatched sector is defective and skipped and recorded. At this time, it is recorded in the above-described primary defect list PDL that the corresponding sector is defective as its positional information.

도 3은 소위, 교체(Linear Replacement)방식을 나타낸 것으로 데이터 기록시 등에 결함이 있는 섹터가 발생되고, 이미 그 결함섹터에 기록된 데이터를 사용자 영역에 있는 해당 존(zone)의 예비영역(spare area)에 옮겨 기록하는 것이다. 즉, 도 3은 섹터 2가 결함이 있어, 이를 예비 영역에 옮겨(교체하여) 기록한 경우를 예시한 것이다. 교체되는 데이터는 예비영역의 앞부분부터 순차적으로 기록된다. 이 때 전술한 2차 결함리스트(SDL)에 해당 섹터가 결함이 있음을 그 위치정보로서 기록하고, 아울러 교체영역의 위치정보를 기록하는 것이다.Fig. 3 shows a so-called linear replacement method, in which a defective sector is generated during data recording, and a spare area of a corresponding zone in the user area is recorded with data already recorded in the defective sector. To record). That is, FIG. 3 exemplifies a case where the sector 2 is defective and is recorded (replaced) in the spare area. The data to be replaced is recorded sequentially from the beginning of the spare area. At this time, the above-described secondary defect list (SDL) records the fact that the corresponding sector is defective as its positional information, and also records the positional information of the replacement area.

이와 같은 교체방식은 도 1과 같이 사용자 영역의 각 존(zone)에는 일정부분을 예비영역(spare area)으로 할당해 놓아야 한다. In this replacement method, as shown in FIG. 1, a predetermined portion of each zone of the user area must be allocated as a spare area.

그러나, 종래의 결함관리 방법에는 아래와 같은 문제가 있다.However, the conventional defect management method has the following problems.

존(zone)내의 예비영역은 결함 발생수를 고려하여 일정부분을 할당해야 하는 데, 무조건 결함 발생이 많을 것을 예상하여 너무나 많은 영역을 예비영역으로 할당하면 실제 데이터가 기록될 수 있는 영역이 줄어든다는 문제가 발생하고, 적은 영역을 예비영역으로 할당한다면 결함이 많은 경우에는 더 이상 데이터를 기록할 수 없다는 문제가 발생한다. The spare area in the zone should be allocated a certain portion in consideration of the number of defect occurrences. If too many areas are allocated as spare areas in anticipation of a large number of defect occurrences, the area where actual data can be recorded is reduced. If a problem occurs, and a small area is allocated as a spare area, a problem arises in that data cannot be recorded any more when there are many defects.

이를 고려하여 DVD-RAM에 있어서는 약 5% 정도의 예비영역을 두고 있지만, 이 또한 문제가 있다. 이러한 경우에도 결함이 발생하지 않거나 조금 발생하는 경우에는 예비영역의 이용 효율성이 떨어져, 즉, 빈 공간으로 남아 디스크 전체를 효율적으로 이용하지 못하는 문제가 아직 남아 있다,In consideration of this, about 5% of the reserved area is provided in the DVD-RAM, but this is also problematic. Even in this case, if the defect does not occur or occurs a little, the utilization efficiency of the spare area is inferior, that is, there remains a problem of remaining empty space and not using the entire disk efficiently.

따라서, 본 발명의 목적은 재기록 가능 디스크에 있어, 디스크의 이용효율성을 높이는 결함 관리 방법을 제공하는 데 있다.
It is therefore an object of the present invention to provide a defect management method for improving the utilization efficiency of a disc in a rewritable disc.

위 목적을 달성하기 위하여, 본 발명에 따른 재기록 가능 디스크의 결함관리 방법에 있어서, 디스크의 일정단위로 구획된 존(zone)내에서 결함섹터가 발견되는 경우 해당 존의 마지막 위치부터 결함섹터의 대체섹터로서 순차 교체기록하는 단계와; 결함섹터와 대체섹터의 위치 정보를 디스크의 결함관리영역에 기록하는 단계로 이루어지는 것을 특징으로 한다.In order to achieve the above object, in the defect management method of a rewritable disc according to the present invention, when a defect sector is found in a zone partitioned by a predetermined unit of the disc, replacement of the defective sector from the last position of the zone is performed. Sequential replacement recording as a sector; And recording the position information of the defective sector and the replacement sector in the defect management area of the disc.

이하, 본 발명에 따른 실시예를 도 4 내지 도 6을 참조하여 설명한다. Hereinafter, embodiments according to the present invention will be described with reference to FIGS. 4 to 6.

먼저 디스크의 사용자 영역을, 도 4에 나타낸 바와 같이 데이터영역과 예비영역을 구획하지 않고, 존(zone)전체를 데이터 영역으로 사용한다. First, as shown in Fig. 4, the user area of the disc is used as the data area without using the data area and the spare area as partitions.                     

전술한 교체방식에 있어 결함이 발생하는 경우에는 해당 존(zone)의 끝부분에서부터 데이터를 즉, 섹터를 교체 처리 하는 방식이다.When a defect occurs in the above-described replacement method, the data is replaced from the end of the corresponding zone, that is, the sector is replaced.

예를 들면 도 5에서와 같이 섹터단위로 기록하는 경우 섹터 1이 결함섹터로 판정되면, 해당 존(zone)의 맨 마지막 섹터를 교체하여 섹터 1의 내용을 기록하고, 해당 결함섹터의 위치(Address) 및 교체된 마지막 섹터의 위치(Address)를 2차 결함리스트(SDL)에 기록한다.For example, in the case of recording in sector units as shown in FIG. 5, if sector 1 is determined to be a defective sector, the last sector of the corresponding zone is replaced to record the contents of sector 1, and the location of the corresponding defective sector (Address) ) And the address of the last sector replaced are recorded in the secondary defect list (SDL).

또한 데이터를 기록하면서 결함섹터가 증가하여 현재 기록하고 있는 해당 존(Zone)에 여유공간이 없을 경우에는 다음 존(Zone)의 맨 끝 섹터에 데이터를 교체 기록한다.In addition, when data is recorded and a defect sector increases, and there is no free space in the currently recorded zone, data is alternately recorded in the last sector of the next zone.

예를 들면 도 6과 같이 존(Zone) 0에 데이터 기록시 섹터 0 에서 섹터 n까지For example, as shown in FIG. 6, from sector 0 to sector n when data is written to zone 0.

기록하면서 섹터 1, 2, n sector에 결함이 발생하면 결함관리에 의해 섹터 1,2는 존 0의 맨 끝 섹터부터 교체 기록해 가고, 섹터 n는 교체 기록될 공간이 Zone 0 에 없기 때문에 그 다음 존인 존 1의 맨 끝 섹터에 교체 기록하게 된다. 그리고 결함섹터의 위치(address) 및 교체된 섹터의 위치(address)를 2차 결함리스트(SDL)에 기록하게 된다. 2차 결함리스트(SDL)의 기록방법은 종래와 같이 할 수 있다.If a defect occurs in sectors 1, 2, and n sectors while recording, defect management records sectors 1 and 2 starting from the last sector in zone 0, and sector n is the next zone because there is no space to be recorded in sector 0. The replacement sector is written to the last sector of zone 1. The address of the defective sector and the address of the replaced sector are recorded in the secondary defect list SDL. The recording method of the secondary defect list SDL can be performed as in the prior art.

이와 같이 하면, 존(zone)이 순차적으로 빈 공간없이 채워지므로 종래기술과 같이 예비영역(spare area)의 불필요한 낭비가 완전히 해결될 수 있는 것이다.In this way, since the zones are sequentially filled without empty space, unnecessary waste of the spare area as in the prior art can be completely solved.

이상, 본 발명의 일실시예에 관하여 설명하였지만, 본 발명은 상기 실시예에만 한정되는 것은 아니고 본 발명의 요지를 벗어나지 않는 범위 내에서 충분히 수정 또는 변형하여 실시할 수 있다.
As mentioned above, although one Embodiment of this invention was described, this invention is not limited only to the said Example, It can implement by a sufficient correction or modification within the range which does not deviate from the summary of this invention.

이상에서와 같이 본 발명에 의하면, 결함이 생긴 만큼만 대체영역으로 사용하기 때문에 디스크 전체의 영역을 효율적으로 사용할 수 있는 것이다.      As described above, according to the present invention, since only the defect is used as the replacement area, the entire area of the disc can be used efficiently.

Claims (2)

데이터 영역 및 결함관리영역을 포함하는 기록가능한 광디스크의 결함관리 방법에 있어서,In the defect management method of a recordable optical disc comprising a data area and a defect management area, 상기 디스크의 일정단위로 구획된 데이터 영역에 데이터를 기록하는 단계;Recording data in a data area partitioned by a predetermined unit of the disc; 상기 데이터 영역에서 결함섹터가 발견되는 경우 해당 존의 마지막 섹터부터 순차적으로 결함섹터의 데이터를 교체기록하는 단계와;If a defective sector is found in the data area, replacing and recording data of the defective sector sequentially from the last sector of the corresponding zone; 상기 결함섹터의 데이터가 교체기록되는 위치 정보를 디스크의 결함관리영역에 기록하는 단계로 이루어지는 것을 특징으로 하는 재기록 가능 디스크의 결함관리 방법.And recording position information in which the data of the defective sector is replaced and recorded in the defect management area of the disk. 제1항에 있어서,The method of claim 1, 상기 데이터 영역 내에 교체기록할 섹터가 부족한 경우 다음 존의 마지막 섹터부터 순차적으로 교체 기록하는 단계를 포함하는 것을 특징으로 하는 재기록 가능 디스크의 결함관리 방법.And replacing and recording sequentially from the last sector of the next zone when there is not enough sector for replacement recording in the data area.
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JPH1032934A (en) * 1996-05-13 1998-02-03 J N T:Kk Battery charger for secondary battery of portable telephone set
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JPH1032934A (en) * 1996-05-13 1998-02-03 J N T:Kk Battery charger for secondary battery of portable telephone set
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