KR20050074078A - Method for management of defective area on optical disc rewritable - Google Patents

Abstract

The present invention relates to a rewritable optical disc and a method for managing a defective area of the optical disc, wherein the defective area management method of an optical disc replaces data to be recorded in a defective block with a spare block. At the time of the replacement recording, information indicating whether the corresponding sector is normally replaced in each sector unit in the spare block is recorded, and the defect entry information is stored in the defect management area (DMA). In the defect entry information, the identification information for identifying whether a corresponding spare block is a defect is recorded, thereby enabling efficient defect area management and re-recording. If possible, there is an advantage of further increasing the use efficiency of the optical disk.

Description

Rewritable optical discs and methods for managing and reproducing defective areas of optical discs {Method for management of defective area on optical disc rewritable}

       BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rewritable optical disc and a method for managing a defective area in the optical disc. In particular, the present invention relates to a method of indicating whether a defective area is normally replaced or not, thereby enabling efficient recording and reproducing of the optical disc.

As optical recording media, optical disks capable of recording large amounts of data are widely used. Among them, recently, a new high-density optical recording medium (HD-DVD) capable of recording and storing high-quality video data and high-quality audio data for a long time, for example, Blu-ray Disc (hereinafter referred to as "BD"). ) Is being developed.

Blu-ray Disc (BD), the next-generation HD-DVD technology, is a next-generation optical recording solution that can store data that significantly surpasses existing DVDs. Recently, world-standard technical specifications have been established.

Relatedly, in a high density optical disc (DVD + RW / DVD-RAM) including a Blu-ray Disc BD, an optical recording / reproducing apparatus (Fig. 6) is automatically applied to a defective area generated in a user data area in the optical disc. It adopts "Physical Defect Management" that performs defect management.

The present invention is to solve the problems that may occur in the "Physical Defect Management" that is applied to the generally rewritable optical disc, mainly for the convenience of the description below rewritable Blu-ray Disc (BD-RE ) Will be described as an example.

Fig. 1 schematically shows the recording area structure of a rewritable Blu-ray Disc (BD-RE). The Blu-ray Disc of Fig. 1 shows the structure of a recording area for a single layer disk having, for example, one recording layer, and a lead-in area when viewed from the inner circumference of the disk. The data area is divided into a data area and a lead-out area. In the data area, an inner spare area ISA0 and an outer spare area OSA0 for replacing the defective area are provided inside and outside of the data area, respectively, with a user data area (User) for recording user data. Data Area) is provided.

If a defective block exists in the user data area during recording and playback of data on a rewritable Blu-ray Disc (BD-RE), the spare block in the spare area is used to store data recorded or to be recorded in the defective block. Move to (Spare Block) and perform the alternative recording.

Then, as defect management information on the defect block, the position information related to the defect block and the spare block is recorded as defect management information (defect entry) in the defect management area (DMA) provided in the lead-in / out area. Will be performed.

In this regard, the minimum recording unit recorded on the disc is one cluster for a BD disc, and one cluster is composed of 32 sectors in total, and an ECC block for a conventional DVD. 1 ECC block is composed of 16 sectors in total, and one sector is composed of 2048 bytes in all cases. In the present invention, the one cluster or one ECC block will be collectively referred to as a "block", which has been generally used in the prior art, and thus "Defective Block" or "Spare Block" as described above or later will be described. ) "Is intended to mean the same as" Defective Cluster "or" Spare Cluster ".

In FIG. 1, when the X1 and X3 blocks in the user data area are determined to be defective blocks, the blocks are replaced with spare blocks in the spare area. The X1 block is replaced by the Y1 block, and the X3 block is replaced by the Y3 block. In addition, if the Y1 block in the spare area is determined to be a defective block, it is replaced by the Y2 block in the spare area, and only the last recorded record is recorded in the defect management area (DMA) as a defect entry. Done. Therefore, in the case of Fig. 1, the last substitute recorded information such as (X1-> Y2) and (X3-> Y3) will be recorded as defect entry information in the DMA. The recording method of the defect entry will be described later in the detailed description of the present invention.

2A and 2B show a case where recording is performed in units of a specific sector in an optical disc on which defect area management is performed as shown in FIG.

That is, as described above, since the minimum recording unit is one block (which means "1 cluster" is included), if a recording command is transmitted to a specific sector that is a lower unit in the block, the optical recording / reproducing apparatus first records. After reading (Read ①) a block containing a desired sector, and reconstructing the data to be recorded in the block including data to be recorded in a specific sector (Modify ②) In this case, the write command is executed in the write (Write ③) step of the block, which is simply called a read-modify-write (RMW) recording method.

FIG. 2A shows the above process. For example, in the case where data is normally recorded by sector A in the X2 block, the X2 block is to be rewritten in the "RMW" manner by the host or the like in the sector X2. If it is a normal block, A and B data is normally recorded in the X2 block after performing "RMW".

However, if the block written in the " RMW " method is determined to be a defective block as in the block X1 of FIG. 1, an operation of replacing the spare block with the spare block Y2 is performed, and FIG. 2B illustrates this process.

That is, in FIG. 2B, if an "RMW" recording is attempted to be performed on the X1 block, but a playback error occurs in the playback step of the X1 block (Read error ①), the optical recording / reproducing apparatus determines the X1 block as a defective block by itself. Then, the data is replaced by the Y1 spare block in the spare area.In this case, only the B data intended to be recorded in the corresponding X1 block is replaced with the Y1 spare block (Replacement ②), and defect management information (defect entry) for the defect management is performed. Recording is done in the area. That is, in the Y1 block, dummy data is recorded instead of the A data of the previous X1 defect block, and only B data is effectively recorded.

However, as the defect management is performed as shown in FIG. 2B, when the optical recording / reproducing apparatus performs recording / reproducing later, in particular, the recording / reproducing section (FIGS. 6 and 20) in the optical recording / reproducing apparatus reproduces the Y1 block so as to control the controller (FIG. 6, 12 (e.g., host), etc., when the result is transmitted, the host or the like recognizes that there exists A data recorded in the previous defect block (X1) in the transmitted Y1 block, and the transmitted dummy. A problem arises in which the dummy data is mistaken for A data. In other words, this is an error that occurs inevitably when the recording and reproducing unit (FIGS. 6 and 20) in the optical recording and reproducing apparatus is based on the existing defect management method in which the defective block is automatically replaced by the spare block without the control command of the controller. .

Therefore, the present invention was created in view of the above situation, and performs an efficient defect management area in a rewritable optical disc, and in particular, a defect management method and reproduction for eliminating errors that may occur during sector-by-sector recording. The purpose is to provide a method.

A defect area management method of a rewritable optical disc according to the present invention for achieving the above object is a method of managing a defect area of an optical disc in which data to be recorded in a defect block is replaced with a spare block. In the replacement recording, information indicating whether a corresponding sector is normally replaced in each sector unit in a spare block is recorded, and the defect management information (DMA) is stored in the defect management area (DMA). record as a defect entry, characterized in that identification information identifying whether a corresponding Spare Block is a defect is recorded in the defect entry.

Another defective area management method of a rewritable optical disc according to the present invention is a defective area management method of an optical disc in which data to be recorded in a defective block is replaced with a spare block. Information indicating that the sector has been replaced normally in every sector unit in the spare block, and playback of the previous defective block because the sector was not normally replaced. It is characterized by recording any one of the information that induces an attempt and the information that induces error processing since the sector is not normally replaced,

Another defective area management method of a rewritable optical disc according to the present invention is a defective area management method of an optical disc in which data to be recorded in a defective block is replaced with a spare block. Records information indicating whether a corresponding sector has been normally replaced in each sector unit in a spare block in the previous block, and a previous defective block is included in a sector that has not been normally replaced among the sectors. Recording an address)

Another defect area management method of a rewritable optical disc according to the present invention is to replace and record data to be recorded in a defect block with a spare block, and to record and manage this as defect entry information. In the defect area management method of an optical disc, the defect entry information includes position information of a defective block, position information of a spare block, and a part of the spare block. In addition to identifying that only the sector (sector) has been replaced normally, the identification information for identifying whether the spare block (Spare Block) is defective, characterized in that it is recorded,

In the method for reproducing a rewritable optical disc according to the present invention, upon receiving a reproduction command for a specific block in the optical disc, it is determined whether the block is a defective block from defect entry information. If it is a defective block, check whether there is a sector that is not normally replaced in the spare block from the spare block in which the data in the corresponding defective block is recorded. When there is a sector that is not normally replaced, the data recorded in the sector is determined as dummy data, and only the data recorded in the normally replaced sector is reproduced. ,

Another reproducing method of a rewritable optical disc according to the present invention is that if a reproduction command for a specific block in the optical disc is received, whether the block is a defective block from defect entry information. If it is a defective block, check whether there is a sector that is not normally replaced in the spare block from the spare block in which the data in the defective block is recorded. After the check, if there is a sector that is not normally replaced, the corresponding sector in the previous defect block (from the address information of the previous defect block recorded in the sector) reproducing data recorded in the sector),

Another reproducing method of a rewritable optical disc according to the present invention is that if a reproduction command for a specific block in the optical disc is received, whether the block is a defective block from defect entry information. If it is a defective block, it is determined whether there is a sector that is not normally replaced in the spare block from the spare block in which the data in the defective block is recorded. If there is a sector that is not normally replaced after checking, if the data recorded in the sector is dummy data, a reproduction error is processed, and the position information of the previous defective block ( address), the data recorded in the corresponding sector in the previous defect block is reproduced.

A rewritable optical disc according to the present invention is an optical disc having a spare block for alternately recording data to be recorded in a defective block, wherein the spare disc is present in a spare block in the spare block. And an area for recording identification information for identifying whether data recorded in each sector is normally replaced data, dummy data, or position information of a previous defective block.

Another rewritable optical disc according to the present invention is an optical disc having a defect management area, comprising an area for recording defect management information in the defect management area, wherein the defect management information is provided. In addition, it identifies the position information of the defective block, the position information of the spare block, and identifies that only a few sectors in the spare block are normally replaced, and the corresponding spare block ( And an area for recording identification information for identifying whether the spare block is a defect.

 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a rewritable optical disc and a defect area management method and a reproduction method of a rewritable optical disc according to the present invention will be described in detail with reference to the accompanying drawings.

      In addition, the terms used in the present invention was selected as a general term widely used as possible now, but in certain cases, the term is arbitrarily selected by the applicant, in which case the meaning is described in detail in the description of the invention, The present invention is to be understood as the meaning of terms rather than names.

Fig. 3 shows a first embodiment of the defect management method of the present invention, characterized in that identification information for distinguishing between sectors that are normally replaced and sectors that are not replaced are recorded in the spare block.

For example, in the case of replacing the spare block Y1 with the occurrence of the RMW proxy corresponding defect block X1, as in the case of FIG. 2B, the sector and the B data portion of the B data portion that are normally replaced and written are replaced. The remaining non-replacement sectors other than the remaining ones are distinguished, and " 1b " The identification information is referred to as "Defective Sector flag", hereinafter referred to as "DS_flag", and the method of recording the "DS_flag" in the spare block will be described later with reference to FIGS. 5A and 5B together with other embodiments.

In the case of the alternative recording as described above, the defect management information (defect entry) is recorded in the defect management area (DMA). In general, the defect management information (defect entry) is constituted as follows.

First, a field "Defective PSN (Physical Sector Number)" which basically records the position information of a defective block in which a defect has occurred and a field "Replacement (Rep.) Physical Sector Number (PSN) which records the position information of a spare block which has been recorded and replaced. Is present, and information identifying the type of defect entry ("Status 1") and a reserved area ("Status 2") for future use are provided.

Therefore, according to the first embodiment, when defect management information is recorded, "X1" indicating the position of the defect block is recorded in the "Defective PSN" field, and the spare block is recorded in the "Replacement PSN" field. "Y1" indicating the position is recorded, and the type of defect entry information is "Status 1 = 0000" because the spare block is normally replaced, and is reserved as "Status 2 = 0000". ) Area. That is, according to the first embodiment, the method of recording defect management information is the same as the conventional method.

According to the first embodiment, since " DS_flag " is provided for each sector unit on one side of the spare block, the recording / reproducing section (FIGS. 6 and 20) in the optical recording / reproducing apparatus spares from defect entry information. After confirming the position of the block Y1, the controller checks the " DS_flag " recorded in the spare block Y1, and controls only the data recorded in the sector corresponding to " DS_flag = 0b " 12), and the data recorded in the remaining sectors, i.e., the sectors corresponding to "DS_flag = 1b", is determined as dummy data to process a reproduction error or from the position of the defective block X1. As it becomes possible to attempt to play back the A data portion, it is possible to solve the problem of misidentifying this as normal data when there is no "DS_flag" in the prior art, as well as the possibility of normal playback of the A data in the defect block X1. Will be.

In relation to this, the reason why the recording / reproducing section (Figs. 6, 20) in the optical recording / reproducing apparatus is operable as described above by confirming "DS_flag" is that the recording / reproducing section (Fig. 6, 20) is replaced with a spare block when it encounters a defective block. In this case, when the data is reproduced, only the spare block data is mechanically reproduced. If there is no "DS_flag" as described above, it is not possible to determine which data among the data in the spare block is normal data, and to recreate the defective block. At the time of playback, it does not check whether there is a portion to be normally played back, but as "DS_flag" exists, it is possible to identify a sector part that is normally replaced and a sector that is not normally replaced in the spare block, and to play back the defective block again. If there is no defect in the non-replaced sector part (for example, the A data part of the X1 block), it is better to transfer that part as normal data. It is function. Of course, if the defective block is reproduced again if there is a defect in the non-replaced sector portion (for example, the A data portion of the X1 block), then the A data portion will handle a playback error.

Therefore, by designing the "DS_flag" by the designer who designs the optical recording and reproducing apparatus, it is possible to eliminate the error and design the most optimal reproduction method.

4A to 4C show the second to fourth embodiments of the defect management method of the present invention, which is determined when the spare block Y1 of the first embodiment (Fig. 3) is determined to be a defective block. It is characterized by a defect management method in the case of performing alternate recording with another spare block Y2 in the spare area.

First, if the first embodiment of Fig. 3 is applied in this case, the RMW recording is attempted by including the C data in the spare block Y1, but the spare block Y1 becomes a defective block due to a reproduction error (Read Error 3). If judged, the data is replaced with another spare block (Y2), but only the C data portion is normally replaced ("DS_flag = 0b"), and the rest is recorded as dummy data, so that "DS_flag = 1b" is recorded. In the defect entry information, "X1" indicating the position of the defect block is recorded in the "Defective PSN" field, and "Y2" indicating the position of the spare block is recorded in the "Replacement PSN" field. Therefore, there is only defect entry information indicating that the replacement is recorded with (X1-> Y2) instead of the defect entry indicating that the previous recording is recorded with (X1-> Y1). As a result, the information on the spare block Y1 that has been first replaced is lost.

In this case, as the control unit (Figs. 6 and 20) of the optical recording and reproducing apparatus checks " DS_flag " recorded in the spare block Y2, the sectors other than the sectors of the C data portion are judged as dummy data which are not normally replaced, Although it is possible to eliminate the error that is judged to be normal data, if the attempt is made to reproduce the B data portion recorded in the spare block Y1, the location information of the spare block Y1 is deleted from the defect entry information. It will no longer be possible to attempt playback.

Therefore, in order to attempt reproduction of the B data in the defective spare block Y1, it is necessary to continuously manage the positional information of the defective spare block Y1. In the second embodiment of the present invention (Fig. 4A), the defect management information (defect entry) The present invention relates to a method of continuously maintaining positional information of a defective spare block Y1, and a third embodiment of the present invention (FIG. 4B) continuously maintains positional information of defective blocks X1 and Y1 in spare blocks Y1 and Y2. The fourth embodiment (FIG. 4C) of the present invention relates to a method of further subdividing " DS_flag " applied to the third embodiment.

Hereinafter, a description overlapping with the first embodiment of FIG. 3 will be omitted and description will be made based on the core features of the embodiment.

First, FIG. 4A shows a second embodiment of a defect management method of the present invention, and as described above, the method of preparing defect entry information is different from that of the first embodiment. .

That is, by utilizing the "Status 2" field in the defect entry, "Status 2 = 0000" means that all sectors in the spare block are normally replaced, and "Status 2 = 0001" indicates that the spare block Only some sectors have been replaced normally, and the spare block has become a defective block again. If "Status 2 = 0010", only some sectors in the spare block have been replaced normally, and that spare block is currently a normal block. Define it.

Therefore, in the case of applying the above example, if the defective block X1 has been normally replaced with a spare block Y1 for some sectors, but the Y1 block is determined to be a defective block, then (0000, X1, 0001, If the defective spare block Y1 is normally replaced for another sector by another spare block Y2, and the current Y2 block is a normal block, the order of each field of the defect management information is (0000, X1, 0010). , Y2) will be registered.

Therefore, the optical recording / reproducing apparatus can check the " Status 2 " field in the defect entry to perform the following reproducing operation.

First, if "Status 2 = 0000", all sectors in the spare block are normally replaced. Therefore, the spare is replaced by using the location information of the spare block recorded in the field "Replacement (Rep). PSN" in the defect entry. The data recorded in the block will be played back. At this time, all sectors will be recorded as "DS_flag = 0b".

In addition, if "Status 2 = 0010", since some sectors in the spare block are normally replaced, the location information of the spare block (Y2) recorded in the "Replacement (Rep). PSN" field in the defect entry is used. Reproduce the data recorded in the spare block, but reproduce only the sectors recorded with "DS_flag = 0b" normally, and process the remaining sectors ("DS_flag = 1b") in a reproducing error or in the defect entry information. By referring to the position information of the defect block X1 recorded in the "Defective PSN" field, the corresponding defect block X1 is also attempted to be reproduced or registered as the defect block X1 and registered as "Status 2 = 0001". After retrieving other defect management information, when reproducing data in the corresponding defective spare block Y1 by using the position information of the defect spare block Y1 recorded in the "Replacement (Rep). PSN" field in the searched defect management information. It is also possible.

4B shows a third embodiment of the defect management method of the present invention, which is another embodiment having the same purpose as the second embodiment as described above, and is reproduced in a spare block as compared with the first embodiment. It is characterized by the fact that it records location information that needs to be attempted.

That is, since the position information of the previous defective block is recorded in the sector ("DS_flag = 1b") that is not normally replaced when the spare block is recorded, the optical recording / reproducing apparatus records the previous recorded in the sector for the sector having "DS_flag = 1b". It will be possible to attempt reproduction of the defective block using the location information of the defective block, in which case the recording method of the defect entry information will be applied in the same manner as in the first embodiment of FIG.

For example, in the non-replaced sector ("DS_flag = 1b") in the spare block Y1, the location information "X1 address" of the previous defect block X1 is recorded, and after the spare block Y1 is determined to be a defective block, another spare is spared. Substitute the block Y2, but record the position information "Y1 address" of the previous defect block Y1 in the sector that is not normally replaced in the spare block Y2 ("DS_flag = 1b"), and finally the defect entry information (defect entry) Only the information recorded as (X1-> Y2) is left.

Figure 4c shows a fourth embodiment of the defect management method of the present invention, as described above is another embodiment having the same purpose as the third embodiment, the "DS_flag" in comparison with the third embodiment It is characterized by increasing the freedom of design of the optical recording and reproducing apparatus by subdividing the definition.

In other words, if "DS_flag = 00b", this means that the sector contains data that is normally replaced. If "DS_flag = 01b", the sector is a normal non-replacement sector. If "DS_flag = 11b" indicates that the location information is recorded, the corresponding sector is a sector which is not normally replaced, which means that dummy data is recorded in the corresponding sector. .

Therefore, as compared with the third embodiment, the optical recording / reproducing apparatus records the position information of the previous defective block in the sector which is not normally replaced with the spare block to induce the reproduction attempt (“DS_flag = 01b”), or It is possible to induce dummy data to be processed for reproduction error processing ("DS_flag = 11b"), and in the case of an optical recording / reproducing apparatus for reproducing an optical disc recorded with "DS_flag = 01b or 11b" as described above, the data is recorded in a spare block By using the "DS_flag = 01b or 11b", it is possible to replay the previous defective block or to process the reproduction error of the data recorded in the current sector, thereby fundamentally mistaken the data in the sector which is not normally replaced as normal data. Not only can the problem be solved, but also the reproduction attempt has the possibility of reproducing the normal data in the previous defective block.

5A and 5B show a method of recording "DS_flag" applied to the first to fourth embodiments of the present invention in a spare block, and FIG. 5A shows a "DS_flag" as in the first to third embodiments. = 0b or 1b ", and is applicable to the case consisting of 1 bit (Fig. 5b), Figure 5b is a case consisting of 2 bits (" DS_flag = 00b or 01b or 11b ", as in the fourth embodiment) The applicable form is shown.

5A and 5B briefly show, for example, the data structure of one cluster (hereinafter, referred to as "one block") of the Blu-ray Disc BD, in which an address field is included in one block. There are 16 (Address Fields; AF) (AF0 to AF15). Each AF includes an AUN (Address Unit Number), 1 byte of flag information (Flag), and parity information (Parity). AF is a structure composed of two sectors.

Therefore, in recording the "DS_flag" related to the present invention in the spare block, recording is performed by utilizing a reserved area in the flag information (Flag) of one byte in the AF, for example, the first embodiment ~ When the "DS_flag" is composed of one bit from the third embodiment, one bit (ex, 5BP) in the flag information Flag is defined as "DS_flag" for a specific sector (i-th sector). In addition, another 1 bit (eg, 4BP) in the flag information Flag may be defined and utilized as "DS_flag" for the next sector (i + 1th sector), and also "DS_flag" which is different from the fourth embodiment. When " is composed of 2 bits, 2 bits (ex, 5, 4BP) in the flag information Flag are defined as " DS_flag " for a particular sector (i-th sector), and flag information Flag Another two bits (ex, 3, 2BP) of the above may be defined as " DS_flag " for the next sector (i + 1 th sector).

In this regard, if the block is a normal block in a data area other than the spare block, the "DS_flag" does not need to be recorded, so that it can be set to a specific value or used for another purpose. Optical discs other than BD (eg, DVD-RAM, DVD + RW) may have a different structure from the above data structure, but likewise utilize a specific reserved area within the spare block. DS_flag "can be recorded is obvious.

6 shows the configuration of the optical recording and reproducing apparatus of the present invention, which controls the operation of the pickup section 11 and the pickup section 11 for reading management information including data recorded in the optical disc and defect management information. The preprocessing unit 13 and the preprocessing unit recover the reproduction signal received from the servo 14 and the pickup unit 11 to a desired signal value, or modulate and transfer the signal to be recorded into a signal recorded on an optical disc. A memory 15 for temporarily storing by loading and a microcomputer 16 for controlling the operation are basically configured, and these components include the "recording / reproducing section 20" or "optical drive." "Also called.

In this regard, the memory 15 used in the present invention is represented by one memory 15 collectively as various storage means (RAM, buffer, etc.) that can exist in the optical recording and reproducing apparatus, and a plurality of storage means having different names. It will be apparent that through the memory 15 of the present invention can be replaced through.

In addition, the AV decoder 17 finally decodes the output data under the control of the controller 12 and provides the same to the user. The AV encoder 18 controls the controller 12 to perform a function of recording a signal on an optical disc. According to the control of the input signal, the input signal is converted into a signal of a specific format, for example, an MPEG2 (MPEG2) transport stream, and provided to the signal processing unit 13 in the recording / reproducing section. The control unit 12 is also utilized as an element for controlling the operation of the entire optical recording and reproducing apparatus.

In addition, the microcomputer 16 in the optical recording and reproducing section 20 performs a role of controlling the operation of the optical recording and reproducing section 20 by itself, and controls the reproducing operation as follows in connection with the present invention.

When a playback command for a specific block in the optical disc is received from the control unit 12, it is checked whether or not the block is a defective block from the defect entry stored in the memory 15. If it is a defective block, check the "DS_flag" from the spare block in which the data in the defective block has been recorded. The sector which is not normally replaced in the spare block is checked. Check if it exists.

Subsequently, according to the first embodiment (Fig. 3), when there is a sector that is not normally replaced ("DS_flag = 1b"), the data recorded in the sector is judged as dummy data and the reproduction error is processed. And control to reproduce only data recorded in the normally replaced sector ("DS_flag = 0b"),

Further, according to the second embodiment (FIG. 4A), when there is a sector that is not normally replaced ("DS_flag = 1b"), the position of the previous defect block is checked from the defect entry, and the corresponding Control to attempt to reproduce a sector to be reproduced, or to process a reproduction error, and control to reproduce only data recorded in a normally replaced sector ("DS_flag = 0b"),

Further, according to the third embodiment (Fig. 4B), when there is a sector ("DS_flag = 1b") that is not normally replaced, the positional information of the previous defective block recorded in the sector ("DS_flag = 1b") (address) is checked to control playback of the corresponding sector, or to handle playback error, and control to play only data recorded in the normally replaced sector ("DS_flag = 0b"),

In addition, according to the fourth embodiment (Fig. 4C), if the sector that is not normally replaced is "DS_flag = 01b", the position information (address) of the previous defective block recorded in the corresponding sector ("DS_flag = 01b") is checked. If the sector that is not normally replaced is "DS_flag = 11b", the data recorded in the sector ("DS_flag = 11b") can be judged as dummy data and processed for playback error. If the sector " DS_flag = 00b " has been normally replaced, the control unit will control to reproduce the data recorded in the sector.

Or more, preferred embodiments of the present invention described above, for the purpose of illustration, those skilled in the art, within the technical spirit and the technical scope of the present invention disclosed in the appended claims below, to further improve various other embodiments Changes, substitutions or additions will be possible.

The present invention distinguishes between normal and non-replaced sectors in which the data to be recorded or recorded in the defective block is replaced with a spare block in a rewritable optical disc, as well as the defect entry information and the defect block. By recording the location information, it is possible to efficiently manage the defect area, thereby increasing the use efficiency of the rewritable optical disc.

1 schematically shows the structure of a general rewritable optical disc,

2A and 2B show a process of performing an RMW recording method on a rewritable optical disc,

Figure 3 shows a first embodiment of the defect area management method of the present invention,

Figure 4a shows a second embodiment of the defect area management method of the present invention,

Figure 4b shows a third embodiment of the defect area management method of the present invention,

Figure 4c shows a fourth embodiment of the defect area management method of the present invention,

5A and 5B show a method of recording "DS_flag" applied to the first to fourth embodiments of the present invention,

Fig. 6 shows a recording / playback apparatus of a rewritable optical disc of the present invention.

-Description of the main parts in the drawing-

20: recording and playback section 20: control section

16: micom 15: memory

Claims (20)

A method for managing a defective area of an optical disc in which data to be recorded in a defective block is replaced with a spare block, the method comprising: At the time of the replacement recording, information indicating whether the corresponding sector is normally replaced in each sector unit in the spare block is recorded, and the defect management information (defect entry) is stored in the defect management area (DMA). ), And in the defect entry, identification information for identifying whether the corresponding spare block is a defect is recorded. The method of claim 1, The identification information indicates whether all sectors in the spare block have been normally replaced, and some sectors in the spare block have not been normally replaced, and the corresponding spare block has not been replaced. Is any one of information indicating that the block is normal and information indicating that some sectors in the spare block have not been replaced normally and the corresponding spare block is a defective block. How to manage defective area of optical disc. The method of claim 2, And the identification information is recorded in " status 2 " in defect management information. A method for managing a defective area of an optical disc in which data to be recorded in a defective block is replaced with a spare block, the method comprising: Information indicating that a corresponding sector has been normally replaced at every sector unit in a spare block at the time of the replacement recording, and a previous defective block because the corresponding sector has not been normally replaced. And one of information for inducing a reproduction attempt of a block) and information for inducing error processing since the corresponding sector is not normally replaced. A method for managing a defective area of an optical disc in which data to be recorded in a defective block is replaced with a spare block, the method comprising: In the replacement recording, information indicating whether the corresponding sector is normally replaced in each sector unit in the spare block is recorded. A method for managing a defective area of a rewritable optical disc, characterized by recording an address of a previous defective block in a sector which is not normally replaced among the sectors. The method of claim 5, In recording an address of a previous defective block in a sector which is not normally replaced among the sectors, writing an address only to a sector in which actual data is recorded in the previous defective block. A defect area management method of a rewritable optical disc, characterized by the above-mentioned. A method of managing a defective area of an optical disc in which data to be recorded in a defective block is replaced by a spare block and recorded and managed as defect entry information. In the defect entry, the location information of the defective block, the location information of the spare block, and only some sectors in the spare block are identified as being normally replaced. And recording identification information identifying whether the corresponding spare block is defective. The method according to claim 1 or 4 or 5 or 7, And the defect area management method is performed at the time of performing recording by a sector unit recording command. The method of claim 8, The sector unit recording command may be performed by reading a block including a sector to be recorded, and including a data to be recorded in a specific sector. And rewriting the data to be recorded therein (Modify), and then writing the data to the corresponding block (Write). The method of claim 8, The sector unit write command includes data to be recorded in a specific sector if a reproduction error occurs when reading a block including a sector to be recorded. A method for managing a defective area of a rewritable optical disc, characterized in that the step of modifying the data to be recorded in the block (Modify), and then replacing with the spare block (Replacement). When a playback command is received for a specific block in the optical disc, Spare block that checks whether the block is a defect block from defect entry, and if the block is a defect block, replaces and records data in the defect block. After checking whether there is a sector in the spare block that is not normally replaced, If there is a sector that is not normally replaced, the data recorded in the sector is judged as dummy data, and only data recorded in the normally replaced sector is reproduced. A reproduction method of a rewritable optical disc. The method of claim 11, If the data recorded in the normal non-replaced sector in the spare block is judged as dummy data, the position of the previous defect block is identified from the defect entry, and corresponding data is determined. A reproduction method of a rewritable optical disc, characterized by further comprising attempting to reproduce a sector. The method of claim 12, And a previous defective block identified from said defect entry is a defective spare block. When a playback command is received for a specific block in the optical disc, Spare block that checks whether the block is a defect block from defect entry, and if the block is a defect block, replaces and records data in the defect block. After checking whether there is a sector in the spare block that is not normally replaced, If there is a sector that is not normally replaced, from the address of the previous defective block recorded in the sector, the corresponding sector in the previous defective block is located. A reproduction method of a rewritable optical disc, characterized by reproducing recorded data. The method of claim 14, When the normal non-replaced sector is present to reproduce data recorded in the corresponding sector in the previous defective block, rewriting is performed if a normal error is not reproduced. Possible method of playing an optical disc. When a playback command is received for a specific block in the optical disc, Spare block that checks whether the block is a defect block from defect entry, and if the block is a defect block, replaces and records data in the defect block. After checking whether there is a sector in the spare block that is not normally replaced, If there is a sector that is not normally replaced, if the data recorded in the sector is dummy data, a reproduction error is processed, and if the address of the previous defective block is addressed, A reproduction method of a rewritable optical disc, characterized by reproducing data recorded in a corresponding sector in a previous defective block. The method of claim 15, A rewrite process is performed if a normal non-replaced sector exists to reproduce data recorded in a corresponding sector in a previous defective block, if a normal reproduction is not performed. Possible method of playing an optical disc. The method of claim 16, And the type of data recorded in each sector of the spare block is confirmed from identification information recorded for each sector unit. In an optical disc having a spare block for alternately recording data to be recorded in a defective block, In the spare block, identification information for identifying whether the data recorded in each sector existing in the spare block is normally replaced data, dummy data, or position information of a previous defective block is recorded. A rewritable optical disc comprising an area. In an optical disc having a defect management area, An area for recording defect entry information in the defect management area, and location information of a defective block and a location of a spare block in the defect entry information. And a region for recording information and identification information for identifying whether the spare block is defective or not, as well as identifying that only some sectors in the spare block are normally replaced. Rewritable optical disc.