KR20040015425A - High density recording medium for write-once adapting to a defect management, method of managing a defect and apparatus thereof - Google Patents

Abstract

PURPOSE: A high-density write-once recording medium, a defect management method and apparatus are provided to record information on a write-once recording medium while avoiding a defect on the recording medium so as to improve reliability of the recording medium. CONSTITUTION: A high-density write-once recording medium records data in a predetermined recording unit. The data is recorded in the recording unit and then verified(S103). When there is a defect in the verification result(S104), no data is recorded in the region of the recording medium where the defect is generated. Data recorded in the defect region and data recorded after the defect region are rewritten in the next region(S105). The recording unit is a track unit composed of clusters. The recording medium further records information about the defect in a predetermined region.

Description

High density recording medium for write-once adapting to a defect management, method of managing a defect and apparatus

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of defect management of recording media, and in particular, a high-density recording medium for recording once, a defect management method, and a defect management method using skip substitution while performing recording in a verify after write mode. To the device.

Conventionally, a defect management method has been made only for a medium which can be repeatedly recorded / reproduced several times and has random access. In the case of a write-once recording medium, that is, a write-once recording medium, the defect management method has not been applied until now.

As a general defect management method, two defect management methods are used, a defect management method using linear replacement and a defect management method using skipping replacement.

The defect management method using linear replacement is a method of replacing a defective area with an area in which no defect occurs in the free recording space when a defect occurs in a specific recording area while the medium is used. The defect management method using this linear substitution is useful when the recording medium is capable of repeating recording and not performing real time recording.

The defect management method using skip substitution is a method of skipping without using a defective area and restarting recording from the immediately next non-defective area. When a defect occurs, data to be recorded is sequentially pushed backward. In general, it is a method that does not use a defective area by skipping and assigning a logical address for recording user data in the area where the defect occurs in advance. The defect management method using this skip substitution is a method of recording a media according to the prior art so that when the media is initialized, that is, the media is inspected for defects before the media is used, the defect area can be skipped and recorded. I'm using.

Therefore, the defect management method using the linear substitution cannot be applied to the recording medium for which the random access is impossible, and the defect management method using the skip substitution cannot be erased and written once once the data is recorded. The recording medium has a problem that it is difficult to apply the conventional skip substitution method to the recording medium for write once as it cannot perform a certification process to check for defects before using the medium.

On the other hand, in the case of a recording medium using optical light, CD-R (Compact Disc-Recording) and DVD-R (Digital Versatile Disc-Recording) are used, followed by a blue laser and multi-layer recording. High-density recording media for one-time recording using new techniques such as layer recording have been developed. High-density recording media for single recording can achieve recording capacity of several tens of gigabytes (GBs) on media of the same size as existing media, and the cost of recording media is low. Unlike conventional back-up media, random access is possible, and the read speed is high, so it can be used for backing up a large computer storage device. However, if a batch backup is required, such as when the user backs up at night when the system is not in use, the backup may not be executed and the operation may be interrupted if a defective area occurs on the media during the backup. There is such a problem.

In order to solve the above problems, it is an object of the present invention to provide a high-density recording medium for write-once, to which a defect management method is applied.

Another object of the present invention is to provide a high-density recording medium for write-once, to which a defect management method using skip replacement is applied while recording data in a verify mode after recording.

It is still another object of the present invention to provide a defect management method in which data is recorded in a verify mode after recording on a high-density recording medium for recording once, and the skipping of defective parts is used.

It is still another object of the present invention to provide a defect management apparatus in which data is recorded in a verify mode after recording on a high-density recording medium for recording once, and the skipping of defective parts is used.

1 is an example in which a defect management method using skip substitution while recording data in a post-record verify mode applied on a recording medium for recording once according to the present invention is illustrated;

2 is another example in which a defect management method using skip substitution is illustrated while recording data in a post-record verify mode applied on a recording medium for write-once according to the present invention;

3 is a flowchart according to an embodiment of a defect management method for a write once density recording medium according to the present invention;

4 is a block diagram of a recording / reproducing apparatus for performing defect management for a high-density recording medium for recording once according to the present invention.

According to the present invention, the above object is achieved in a high-density recording medium for one-time recording: data is recorded in recording units of a predetermined size; The data is verified after being recorded in the recording unit, and if the verified result is defective, the portion where the defect is generated is not recorded any data; And the defective portion and the data recorded thereafter are rewritten at the next recording position. Here, the recording unit of the predetermined size is preferably a track unit composed of a predetermined number of clusters or one cluster unit.

According to another field of the invention, the above object is a defect management method for a high-density recording medium for write-once, comprising: (a) verifying recorded data after recording data of a recording unit of a predetermined size; And (b) rewriting the defect portion and the data recorded after the defect portion at the next recording position after skipping the defective portion if the result verified in step (a) is defective. Is achieved by the method. Here, the recording unit of the predetermined size is preferably a track unit composed of a predetermined number of clusters or one cluster unit.

According to another field of the present invention, the above object is a drive unit for driving a recording medium, an optical pickup unit for irradiating light to the recording medium to write / read the corresponding data, modulated or recorded with a signal for recording data. A recording / reproducing apparatus of a high-density recording medium for recording once, including a signal processing unit for restoring a made signal to original data, comprising: transmitting data on the recording medium through the signal processing unit and the optical pickup unit in a recording unit of a predetermined size; After recording in the recording area, the data read through the optical pickup unit and the signal processing unit is verified, and if there is a defect, the defective portion is skipped, and the defective portion and the data recorded thereafter are recorded through the signal processing unit and the optical pickup unit. And a control unit for controlling to rewrite to the next recording position on the medium. Achieved by a defect management device. The defect management apparatus further includes a memory for temporarily storing information about the skipped defect portion and data recorded thereafter.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

In the defect management method which can be applied to the high-density recording medium for recording once according to the present invention, a linear substitution suitable for a recording medium capable of repeatable recording cannot be applied, and only skip substitution can be used. However, in the present invention, since the high-density recording medium for one-time recording cannot perform a certification process that checks for a defect before using the medium, the present invention verifies the recorded content after recording a portion and is normally recorded. If the data is recorded in the verify mode, which continues to record the next part to be recorded, the defective part is skipped using skip substitution using the skip substitution, and the data recorded after the defective part at the next recording position Through the process of rewriting the corresponding data, the defect management method is applied to the high-density recording medium for one-time recording to improve the reliability of the recording medium. In the post-record verify mode, the recording of the portion is made in a recording unit of a predetermined size, and the recording unit of the predetermined size is a track unit or a cluster unit corresponding to the number of clusters that the disk can record during one rotation. Can be

In this case, the recording medium may be minimal, such as error correction encoding for error correction or interleaving recording between error correction blocks for recording the error correction blocks in physically distributed positions to increase resistance to physical defects of data. The unit that can be recorded is limited to cluster or error correction block units. This limited minimum recording unit is defined as a recording cluster or simply a cluster.

FIG. 1 is an example in which a defect management method using skip substitution while recording data in a post-record verify mode applied on a recording medium for one-time recording according to the present invention is illustrated. If you are showing. The defect management method using skip substitution while performing the track-by-track verification mode while minimizing the pickup amount has the advantage of fast recording speed, while also recording the data recorded after the cluster in which the defect occurs. The utility of the user data area may be degraded.

Here, a unit for processing data may be divided into sectors and clusters, and a sector is a minimum unit capable of managing data in a computer file system or an application, and a cluster may be physically recorded on a disk at one time. Means the smallest unit that exists. Typically, one or more sectors make up a cluster.

In addition, a sector is further divided into a physical sector and a logical sector, which means space for recording one sector of data on a disk, and an address is given to find it, and this address is referred to as a physical sector number ( It is called Physical Sector Number (PSN). A logical sector is a sector unit for managing data in a file system or an application program, and a logical sector number (LSN) is given. A recording / reproducing apparatus for recording and reproducing data on a disc finds a location on the disc of a data to be recorded by using a physical sector number. A computer or application for recording data manages the entire data in logical sector units. The data position is managed by the logical sector number. The relationship between the logical sector number and the physical sector number is converted by the controller of the recording / reproducing apparatus by using a defect status and a recording start position.

Referring to Fig. 1, user data for one track in units of one recording track (here, LSN = n, LSN = n + 1 * k, LSN = n + 2 * k, LSN = n + 3 * k, and LSN = n After recording + 4 * k, LSN = n + 5 * k), jump back 1 track. Here, one cluster is composed of k sectors, and one recording track unit is composed of a predetermined number of clusters.

One track is jumped back and verified by reading one track of recorded data from the beginning of the track, if a defect is found, from the defective cluster (here LSN = n + 4 * k) to the last cluster in that track. After skipping, the defective cluster and subsequent clusters are recorded again on the next track to be recorded, and information corresponding to the skipped cluster is stored in the temporary storage space of the recording / reproducing apparatus.

When reading and verifying recorded data for one track, if a defect does not occur and is normally recorded, the process of recording and then verifying user data in units of tracks to be recorded is repeated.

On the other hand, it is also possible to record and verify track-by-track and record only the defective cluster again in a new recording area. However, in this case, the defective cluster, the recording area in which the defective cluster should be newly recorded, and between Not only the information on the cluster or the like recorded without defects is required, but also a complicated process is required for the recording / reproducing apparatus to read out the recorded data, so that there is no practical advantage.

FIG. 2 is another example in which a defect management method using skip substitution is illustrated while recording data in a post-record verify mode applied on a recording medium for one-time recording according to the present invention. In particular, FIG. The case is showing. The defect management method using the skip substitution while performing the verify mode after the recording in the cluster unit can use the user data area efficiently, but the recording speed can be somewhat slow.

Referring to FIG. 2, if no defect occurs in recording user data in one cluster unit and jumping and verifying one track, the next user data is recorded and verified in cluster units. Then, after recording user data of one cluster (LSN = n + 4 * k), jump back one track, that is, jump to the first position in the track, and then normal clusters (LSN = n, LSN = n). Read and verify the recorded data (LSN = n + 4 * k) of 1 cluster past + 1 * k, LSN = n + 2 * k, LSN = n + 3 * k). After skipping only the found clusters (LSN = n + 4 * k), the user data corresponding to the defective cluster is rewritten to the next cluster to be recorded, and information about the skipped cluster is stored in the temporary storage space of the recording / reproducing apparatus.

After repeating recording and verification, skipping all the defective areas and recording all data to be recorded, a predetermined area capable of recording appropriate defect management information on the disk for information on defects stored in the temporary storage space. By writing to the data, all of the user data area is not used, and an empty recording area in which no data is written remains, so that new data can be written after the previously recorded user data area, or a defective part when reading the recorded data. Skips to locate and read a normally recorded data area.

In this case, when recording and verifying are repeated in cluster units, the recording medium, i.e., the disk rotates, reads and writes data with a single laser beam, so that only one track can be jumped back in order to read and verify the recorded cluster. At the position, it causes a slowing down of the recording speed by the time the disk rotates until it reaches the currently recorded cluster in the track, but only the defective cluster is skipped so that the user data area can be used efficiently.

On the other hand, when recording and verifying are repeated in track units, the recording speed is increased because multiple clusters corresponding to one track can be recorded and verified at the same time as recording and verifying by one cluster. However, in order to maintain the logical sector numbers of the recorded data sequentially, since all the clusters recorded after the cluster in which the defect occurs have to be rewritten, the use efficiency of the data recording space is reduced. It is also possible to record more than one track at the same time for faster recording speed, but in this case it is time to jump back all tracks in one track unit and time to jump back all tracks in multiple track unit. Since only the difference in the degree of difference can be reduced, not only does the recording speed not be significantly improved, but a problem occurs that the loss of the recording area becomes larger when a defect occurs at the beginning of the plurality of track units to be recorded.

3 is a flowchart according to an embodiment of a defect management method for a write once density recording medium according to the present invention.

Referring to Fig. 3, after recording user data in one recording unit (one track unit or one cluster unit) (step S101), one track is jumped back (step S102). In verifying the recorded data in the track (step S103), it is determined whether the recorded data is defective (step S104). If there is a defect in the recorded data, the cluster containing the defect and all data recorded after the defect cluster are rewritten to the next recording position (step S105). In this case, after skipping all the defective clusters and the clusters after the defective cluster in the track, the data corresponding to the defective cluster and the subsequent clusters are rewritten on the next track to be recorded, and recorded and verified in cluster units as shown in FIG. 2. If so, skip only the faulty cluster and rewrite the data corresponding to the faulty cluster to the next cluster location to record. If no defect is found in the data on which the determination result is recorded in step S104, the process of recording and verifying the next data in one track unit or one cluster unit is repeated (step S106).

4 is a block diagram of a recording / reproducing apparatus for performing defect management for a high-density recording medium for recording once, according to an embodiment of the present invention. The driving unit 20 for driving the disk 10 as a recording medium is shown in FIG. An optical pickup unit 30 for writing or reading data by irradiating light onto the disc 10, a signal processing unit 40 for modulating a signal for recording data or restoring the recorded signal to original data; And a control unit 50 for controlling each processing block, and a memory 60 for temporarily storing data to be recorded and temporarily recording information necessary for defect management.

Referring to FIG. 4, recording data input through the control unit 50 for recording is recorded on the disc 10 through the signal processing unit 40 and the optical pickup unit 30, and at this time, the recording position on the disc 10. Is adjusted by the drive unit 20. The position to be recorded and the amount of data are controlled by the controller 50. The recorded data is read through the optical pickup section 30 and the signal processing section 40 under the control of the control section 50, and the control section 50 records the data read from the recorded area and the current recording remaining in the memory 60. If a defect occurs after comparing the data, the cluster in which the defect occurs and the data recorded thereafter are written back to a new recording area on the disc 10 through the signal processing unit 40 and the optical pickup unit 30, and the defect Information about the cluster and the data recorded thereafter is recorded in the memory 60 which is a temporary storage space. After the data to be recorded are recorded sequentially through recording and verification, information on defects stored in the memory 60 is read under the control of the control unit 50 to read the signal processing unit 40 and the optical pickup unit 30. Is recorded in a predetermined area on the disc 10.

The present invention is not limited to the above embodiments and can be implemented in various modifications without departing from the technical gist of the present invention.

As described above, the present invention applies a defect management method using skip substitution while recording data in a verification mode after recording to a high-density recording medium for one-time recording, so that even in a high-density recording medium for one-time recording with defects, The recording can be continued while being avoided, thereby increasing the reliability of the recording medium.

In addition, the present invention, if a high-density recording medium for recording once used for batch backup of a mass computer storage device, even if a defective area occurs on the medium, a defect management method using skip substitution is applied to backup without interruption of operation. By doing so, it is possible to avoid unwanted interrupt operations such as the necessity of redoing and the use of the medium, thereby improving the reliability of the system.

Claims (30)

In a high density recording medium for write once: Data is recorded in recording units of a predetermined size; The data is verified after being recorded in the recording unit, and if the verified result is defective, the portion where the defect is generated is not recorded any data; And And the data recorded after the defective portion is rewritten at the next recording position. The recording medium of claim 1, wherein the predetermined size recording unit is a track unit composed of a predetermined number of clusters. The recording medium of claim 1, wherein the recording unit of the predetermined size is one cluster unit. 2. The recording medium of claim 1, wherein information about a defect present on the recording medium is further recorded in a predetermined area. For high density recording media that use light and can only be written once: Data is recorded in track units consisting of a predetermined number of clusters; The data is verified after being recorded in the track unit, and if the verified result is defective, no data is recorded from the defective cluster to the last cluster in the track; And And data corresponding to a defective cluster and clusters recorded thereafter are rewritten on a track to be recorded next. 6. The recording medium of claim 5, wherein information about a defect present on the recording medium is further recorded in a predetermined area. For high density recording media that use light and can only be written once: Data is recorded in cluster units; The data is verified after being recorded in the cluster unit, and if the verified result is defective in the cluster, the defective cluster does not record any data; And And a data corresponding to the defective cluster are rewritten in the cluster to be recorded next. 8. The recording medium of claim 7, wherein information about a defect present on the recording medium is further recorded in a predetermined area. In a defect management method for a high-density recording medium for write-once: (a) recording the data in a recording unit of a predetermined size and then verifying the recorded data in the recording unit; And (b) if the result verified in step (a) is defective, the defective portion includes skipping and rewriting the defective portion and the data recorded after the defective portion at the next recording position. Defect management methods. The method of claim 9, wherein the method is (c) if the result verified in step (a) does not have a defect in the corresponding recording unit, recording the data of the next recording unit and repeating the process of verifying the data. The method of claim 9, wherein the method is and (d) temporarily storing information about the skipped defect portion and data recorded thereafter in a temporary storage space. The method of claim 11, wherein the method is (e) recording information on a defect present on the recording medium by using the information stored in the temporary storage space in a predetermined area on the recording medium. The defect management method according to claim 9, wherein the recording unit having a predetermined size is a track unit consisting of a predetermined number of clusters. The defect management method according to claim 9, wherein the recording unit of the predetermined size is a cluster unit consisting of a predetermined number of sectors. In a defect management method for a high density recording medium that uses optical and can only record once: (a) recording data in track units consisting of a predetermined number of clusters and then verifying the recorded data in track units; And (b) If the result verified in step (a) is defective, the data corresponding to the defective cluster and the clusters recorded thereafter are skipped from the defective cluster to the last cluster in the track and then recorded on the next track to be recorded. And rewriting the defect management method. The method of claim 15, wherein the method is and (c) repeating the step of recording the data in the next track unit and repeating the verification if the track verified in step (a) does not have a defect in the corresponding track. The method of claim 15, wherein the method is and (d) temporarily storing information about the skipped defect cluster and the cluster recorded thereafter in a temporary storage space. The method of claim 17, wherein the method is (e) recording information on a defect present on the recording medium by using the information stored in the temporary storage space in a predetermined area on the recording medium. The method of claim 15, wherein the step (a), (a1) recording data in track units consisting of a predetermined number of clusters; (a2) jumping back one track; And and (a3) reading and verifying the data recorded in the step (a1) in track units. In a defect management method for a high density recording medium that uses optical and can only record once: (a) recording the data in cluster units and then verifying the recorded data in cluster units; And (b) if the result verified in step (a) is defective in the corresponding cluster, skipping the defective cluster and then rewriting data corresponding to the defective cluster in the next cluster. The method of claim 20, wherein the method is (c) if the result verified in step (a) does not have a defect in the cluster, further comprising repeating the process of recording and verifying data of the next cluster unit. The method of claim 20, wherein the method is and (d) temporarily storing information about the skipped defect cluster in a temporary storage space. The method of claim 22, wherein the method is (e) recording information on a defect present on the recording medium by using the information stored in the temporary storage space in a predetermined area on the recording medium. The method of claim 20, wherein step (a) comprises: (a1) recording data in units of clusters; (a2) jumping back one track; And (a3) The defect management method comprising the step of reading and verifying the data recorded in the step (a1) of the cluster unit. A drive unit for driving a recording medium, an optical pickup unit for irradiating light to the recording medium to write / read corresponding data, and a signal processing unit for modulating a signal for recording data or restoring the recorded signal to original data A recording / reproducing apparatus of a high-density recording medium for recording once, comprising: The data is recorded in the recording area on the recording medium through the signal processing unit and the optical pickup unit in a recording unit of a predetermined size, and then the data read through the optical pickup unit and the signal processing unit is verified. And a control unit for controlling to rewrite a later defective portion and data recorded thereafter to the next recording position on the recording medium through the signal processing unit and the optical pickup unit. 27. The apparatus of claim 25, further comprising a memory for temporarily storing information about the skipped defect portion and data recorded thereafter. 27. The apparatus of claim 26, wherein the controller, after sequentially recording and verifying data to be recorded, sequentially stores information on defects temporarily stored in the memory through the signal processing unit and the optical pickup unit on the recording medium. And controlling more to write to the area. 27. The recording position of claim 25, wherein the recording position on the recording medium is adjusted by the driving section, the memory temporarily stores further data to be recorded, and the control section further includes a position to be recorded, an amount of data, and the like. And controlling and verifying whether there is a defect after comparing the data read from the area recorded by the optical pickup unit and the signal processing unit with the currently recorded data remaining in the memory. 27. The defect management apparatus as claimed in claim 25, wherein the recording unit of the predetermined size is a track unit composed of a predetermined number of clusters. 27. The defect management apparatus as claimed in claim 25, wherein the recording unit having the predetermined size is one cluster unit.