KR20040092313A - Method for defect management during reproducing a write once disc, disc drive and a wirte once disc thereof - Google Patents

Abstract

PURPOSE: A defect management method for reproducing a write-once disk, a disk drive therefor and a disk therefor is provided to verify a certain area including a defect-generated part, and to replace generated defects or to display the defects only, to update TDMS(Temporary Defect Management Structure) information one time. CONSTITUTION: By a read command of a host(401), a drive reads data(402). If a defect cluster is generated(403), an ECC(Error Correcting Code) is confirmed with regards to the defect cluster(404). The generated defect is replaced with a spare area(405). The replaced information is reflected on a TDFL to update TDMS information(406).

Description

Method for defect management during reproducing a write once disc, disc drive and a wirte once disc

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to defect management of a recording disc once, and more particularly, to a method, apparatus and a disc for managing defects when a recording disc is reproduced once.

Defect management refers to a process of rewriting user data recorded in a portion where a defect occurs when user data recorded in the user data area occurs to compensate for data loss due to a defect occurrence. Conventionally, defect management is largely divided into a defect management method using linear replacement and a defect management method using skipping replacement. Linear replacement means that when a defect occurs in the user data area, the defective area is replaced with an area where a defect in the spare area does not occur. Skipping refers to the use of areas skipped without using the defective areas, followed by areas that are not defective.

Both the linear replacement method and the skip method are applicable only to discs capable of repeatable recording such as DVD-RAM / RW and recording by the random access method. In other words, the conventional linear replacement method and the skip method are difficult to apply to a write once disc which can only be written once. This is because whether or not a defect has occurred is confirmed by actually recording data. However, in the case of a write-once disc, once data has been written, it cannot be erased and written again, so that defect management by the conventional method is impossible.

On the other hand, a high density write once disc having a recording capacity of several tens of GB has been proposed following CD-R, DVD-R and the like. These disks are used for backup because they are relatively inexpensive, have random access when reading data, and are relatively fast to read. However, since the defect management for the write-once disc is not performed, if a defective area is generated during the backup, the backup may not be continued and is interrupted. Since backups occur, especially at times when the system is not used frequently, usually at night when there are no administrators, it is likely that backups will no longer be performed if a backup is interrupted due to a faulty zone.

Accordingly, the present applicant has filed a patent for a defect management method, a device and a plurality of inventions of the disk, which perform defect management by providing a defect management area and a temporary defect management area on a recording disc once. For example, patent application No. 02-61897 filed October 10, 2002. According to this, the temporary defect management structure (TDMS) is updated and recorded in the temporary defect management area at predetermined intervals. TDMS is composed of TDDS, which is temporary defect management information, and TDFL, which is temporary defect information, or is composed of TDDS, TDFL, and Space Bit Map (SBM). SBM refers to information about all areas in which data is recorded, which are recorded in a predetermined area in a bitmap format after data recording. In other words, the SBM informs the clusters in which data is recorded and the clusters in which data is not recorded among a plurality of clusters constituting the lead-in area, the lead-out area and the data area.

In general, there are two main types of defects found when playing a disc that performs defect management. One is a defect (complete defect) that cannot be reproduced because of poor error correction, and the other is a defect that is highly likely to be corrected later but that cannot be reproduced later (incomplete). Defect). In the case of incomplete defects, it is important to replace the defects in advance to increase the reliability of the data in the future, and in the case of complete defects, it is desirable to inform the location of the defects for future use.

However, when defect management is performed using the temporary defect management area, it is difficult to cope with a defect found in the above-described manner when playing a recording disc once. This is because, once a recording disc is not large enough in size, the temporary defect management area is limited to a certain time of updating. On the other hand, in case of data requiring real time reproduction, even if an incomplete defect occurs during reproduction, real time reproduction becomes difficult when the defect is processed by a linear substitution method.

Accordingly, the technical problem to be achieved by the present invention is to provide a method for more efficiently dealing with defects when playing a recording disc once, a disc drive thereof, and a disc thereof.

Another object of the present invention is to provide a method for dealing with a defect so that real time reproduction is possible when a recording disc is reproduced once, a disc drive and a disc.

1 is a block diagram of an apparatus for performing defect management according to the present invention;

2 is a block diagram of a disk drive in which FIG. 1 is implemented;

3 is a structural diagram of a write once disc 100 according to the present invention;

4 is a flowchart for explaining a defect management method 1 during reproduction according to the present invention;

5 is a flowchart for explaining a defect management method 2 during reproduction according to the present invention.

According to the present invention, there is provided a method of managing a defect of a recording disc once, according to the present invention, the method comprising: (a) finding a defect during reproduction; (b) replacing the data recorded in the defect in the spare area if the found defect is capable of error correction; And (c) recording the information regarding the found defect and the corresponding replacement into the temporary defect management area provided on the recording disc once.

The step (a) includes a step of finding a defect by verifying any one of a file unit, a folder unit, and the entire data when a defect occurs during playback, and is performed according to a command of a host, or SBM when a defect occurs during playback. It is preferable to include a step of finding a defect by verifying a predetermined area including a portion where a defect has occurred using, and the step of finding a defect using the SBM by the drive itself without a command from the host.

On the other hand, according to another field of the present invention, the technical problem is a one-time recording disk drive, the pickup unit for reading data from or recording data on the recording disk once; And if a defect is found during playback, and if the found defect is capable of error correction, the data recorded in the defect is replaced with a spare area, and information about the replacement corresponding to the found defect is transferred to the temporary defect management area provided on the recording disk once. And a control unit for controlling the pickup unit to record.

On the other hand, according to another aspect of the present invention, the technical problem is a one-time recording disk in which a lead-in, a data area, and a lead-out is arranged, a defect management area provided in at least one of the lead-in and lead-out; A temporary defect management area provided in at least one of the lead-in and lead-out and in which temporary defect management information and temporary defect information are recorded at predetermined intervals; And a spare area provided in the data area to replace and record a defect found during reproduction, and the temporary defect management area includes information on defects found during reproduction and their replacement and information indicating defects found during reproduction. It is also achieved by a disc characterized in that the TDMS information including at least one of is updated and recorded at one time.

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

1 is a block diagram of an apparatus for performing defect management according to the present invention.

Referring to FIG. 1, the apparatus according to the present embodiment includes a recording / reading unit 1, a control unit 2, and a memory unit 3. The recording / reading unit 1 records data on the disc 100, which is an information storage medium according to the present embodiment, and reads out the recorded data, according to the command of the control unit 2. FIG. The control unit 2 reproduces the data read out from the recording / reading unit 1. At this time, defect management according to the present invention is performed.

FIG. 2 is a block diagram of a disk drive in which FIG. 1 is implemented.

2, the disc drive includes a pickup 10 as the recording / reading section 1. The disk 100 is mounted to the pickup 10. The disk drive also includes a PC I / F 21, a DSP 22, an RF AMP 23, a SERVO 24, and a SYSTEM CONTROLLER 25 as the control unit 2. The memory unit 3 is provided in the SYSTEM CONTROLLER 25 of the control unit 2.

At the time of reproduction, the PC I / F 21 receives a reproduction command from a host (not shown). The SYSTEM CONTROLLER 25 performs initialization required for playback. The pickup 10 outputs an optical signal obtained by irradiating a laser beam to the disk 100 and receiving a laser beam reflected from the disk 100. The RF AMP 23 converts the optical signal output from the pickup 10 into an RF signal and provides modulated data obtained from the RF signal to the DSP 22, while providing a servo signal for control obtained from the RF signal. To provide. The DSP 22 demodulates the modulated data and outputs the data obtained through ECC error correction. Meanwhile, the SERVO 24 receives the servo signal received from the RF AMP 23 and the command required for the servo control received from the SYSTEM CONTROLLER 25 to perform servo control on the pickup 10. The PC I / F 21 sends data received from the DSP 22 to the host. In addition, the SYSTEM CONTROLLER 25 performs defect management in accordance with the present invention upon regeneration. The SYSTEM CONTROLLER 25 may instruct the pickup 10 to read the necessary information for defect management.

3 shows the structure of a recording disc 100 once in accordance with the present invention.

Referring to FIG. 3, the recording disc 100 is a single recording layer disc provided with a lead in, a data area, and a lead out in succession. At least one of the lead-in or lead-out is provided with a defect management area, a primary temporary defect management area Primary TDMA, a recording condition test area, and a drive information area. The data area is provided with one or a plurality of spare areas and a secondary temporary defect management area Secondary TDMA for replacing a defective cluster when a defect occurs. In the primary and secondary TDMA, the temporary defect management information TDDS and the temporary defect information TDFL are recorded or TDDS, TDFL, and SBM are recorded. Secondary TDMA can be allocated according to user's intention or drive manufacturer's intention. This allows the user or drive maker to expand the disk usage. In the TDDS, recordable position information, TDFL position information, write protection information, update count, update count, position and size information of each region of the data region, and C_flag may be recorded in the TDDS. The TDFL includes information for generating a defect and replacing the defect, or information indicating the defect itself.

Once the recording disk is first inserted into the drive, the drive records initialization information according to the defect management presence or absence selected according to the intention of the user or the drive manufacturer as TDMS information, that is, as TDDS information of the TDMS, in the initial area of the primary TDMA. Initialization information to be recorded in TDDS includes information on disk usage and disk management information such as location and size of spare area to be replaced in case of defect, consistency flag = '0', size and location of user data area, etc. Include.

After the initialization, user data is written to the disc by the host's write command, and when it is inserted into the drive again, the drive accesses the TDMA area where TDMS information is recorded, reads the information necessary for playback, and prepares to perform playback. do. When a play command from the host is issued, the drive uses the TDMS information recorded in the TDMA, in particular the physical sector number (PSN) corresponding to the logical sector number (LSN) to be played by the host using TDDS and TDFL. To play).

Referring to the defect management method during the playback according to the preferred embodiment of the present invention based on the above configuration as follows.

< How to manage defects during playback 1>

The defect management method according to the present embodiment is performed only when an error is corrected during reproduction, but a defect that is determined to be difficult to reproduce due to error correction is not performed in the future. That is, the drive performs the regeneration by the regeneration command of the host, and if it finds a defect, it determines whether the defect is a replaceable defect or not. This is determined by the error correction of the cluster in which the defect has occurred. This is because if data error correction is impossible, the data cannot be replaced since it cannot be known what data has been recorded.

In the event of a fault that can be replaced during playback, that is, a fault but error correction has occurred, the drive may not be able to recover the data of the drive more than the data transfer rate to the host even during idle time without host command or during host command. If the task execution speed is relatively high, and it is determined that there is time to deal with the defect, the defect is replaced and the replaced information is updated as TDMS information in TDMA.

In order to efficiently use the temporary defect management area TDMA, the TDMS information may be updated by performing one or more reproduction commands of the host, and then performing defect processing on defects generated therebetween. Of course, information regarding the defects generated in the meantime should be stored in the memory unit 3.

If the defect is processed after the replay command of the host is completed, the data recorded in the defect cluster needs to be known in order to replace the defect cluster. Therefore, if the defect is replaceable when replaying each cluster, the memory unit is stored. Stored in (3) in advance, or after the reproduction is finished, the defective cluster is approached again to perform error correction, and then the error corrected data is recorded in the replacement cluster of the spare area.

4 is a flowchart for explaining a defect management method 1 during reproduction according to the present invention.

Referring to FIG. 4, when the drive performs playback (step 402) and a defect cluster is found (step 403) by the host's playback command (step 401), it is checked whether the error is corrected for the defect and then error correction. If it is determined (step 404), the defect is replaced with the spare area (step 405), and the TDMS information is updated by applying the replaced information to the TDFL (step 406). The task of replacing the fault and updating the TDMS is performed at the leisure time after completing the operation according to the command of the host, or when it is determined that there is enough time even during the execution of the command of the host.

If the defect found during playback is not error corrected (step 304), that is, if it is a complete defect, it ignores it and continues the playback operation, that is, proceeds to step 302.

< Defect Management Method 2 during Playback >

If a fault occurs while the drive performs a play operation by the host's play command, the host is notified of the fault information. When a command is issued from the host to verify the entire data recorded in the file or folder or user data containing the defects, the drive finds the PSN corresponding to the LSN by the host's command and performs the verification. Defects are written back in the spare area and replaced. Next, the information on the replaced defect and the information on the defects which are sufficient only for the defect indication are updated at once with TDMS information and recorded in the temporary defect management area TDMA.

Defects that need replacement are stored separately when the defect cluster found during verification is considered to be replaceable and used for replacement after verification is completed, or the location information of the defect cluster found during verification is stored internally. After the verification is completed, based on the position information, the replaceable defective cluster is accessed again, data is read, and error correction is performed to record the error corrected data in the replacement cluster of the spare area.

5 is a flowchart for explaining a defect management method 2 during reproduction according to the present invention.

Referring to FIG. 5, in response to a regeneration command of the host (step 501), the drive performs regeneration (step 502), and if a defective cluster is found (step 503), the drive is notified to the host, and the host is in file or folder units. Command to perform verification or to verify the entire recorded data (step 504). In response to this, the drive finds a physical sector number (PSN) corresponding to a logical sector number (LSN) and performs verification (step 505). Defects found during verification are temporarily stored inside the drive. If replacement is necessary for the defects found as a result of the verification, the replacement is performed, and if only the defect indication is required, the defect indication is performed (step 506), and defect management is performed by updating the TDMS information once (step 507).

< Defect Management Method 3 during Playback>

When the space bit map SBM is recorded on the recording disc 100 once, if a defect occurs during reproduction, the drive verifies a certain area including the portion where the defect itself occurs with reference to the SBM. After the verification is completed, defect management is performed by replacing the found defects if necessary and replacing them. If only the defect indication is required, defect indication is performed to update the TDMS information once.

The defect management method 3 in reproduction is substantially the same as that shown in FIG. However, the problem is that the verification command is not issued from the host and defect management is performed. Instead, the drive verifies a certain area including a defective part by itself using the SBM.

The above methods can be applied to data in an AV environment that requires real time playback, but more preferably applied in a PC environment that does not require real time playback. In the case where a large continuous defect occurs in an AV environment requiring real time reproduction, it is preferable to display the defective portion, and then jump and reproduce the portion when playing again. Rather than sending a broken video file, it's better to jump over that part to get a better response.

As described above, according to the present invention, defects can be handled during reproduction so that real time reproduction is possible when the recording disc is reproduced once.

Claims (12)

In the method of managing the defect of the recording disc once, (a) finding a defect in regeneration; (b) replacing the data recorded in the defect in the spare area if the found defect is capable of error correction; And and (c) recording the information regarding the found defect and the corresponding replacement in the temporary defect management area provided in the recording disc once. The method of claim 1, Step (a) is If a defect occurs during playback, verifying any one of a file unit, a folder unit, and all of the data to find the defect. The method of claim 2, Step (a) is Characterized in that the step performed according to the command of the host. The method of claim 1, Step (a) is If a defect occurs during playback, verifying a predetermined area including the portion where the defect has occurred using the SBM to find the defect. The method of claim 4, wherein Step (a) is And using the SBM to find a fault by the drive itself without command from the host. Once in the write disc drive, A pickup unit for reading data from or writing data to the write disc once; And Detect defects during playback, replace the data recorded in the defects in the spare area if the found defects are capable of error correction, and record information on the replacement corresponding to the found defects in the temporary defect management area provided on the recording disk once. And a control unit for controlling the pickup unit to control the pickup unit. The method of claim 6, The control unit And if the defect occurs during playback, controlling the pick-up unit to verify the defect by one of a file unit, a folder unit, and the whole data to find the defect. The method of claim 7, wherein The control unit And controlling the pickup to perform the verification according to a command of a host to find a defect. The method of claim 6, The control unit And controlling the pick-up unit to find a defect by verifying a predetermined area including a defective portion by using an SBM when a defect occurs during reproduction. The method of claim 9, The control unit Device for detecting a defect by using the SBM itself without a command from the host. In a recording disc in which a lead-in, a data area, and a lead-out are arranged, A defect management area provided in at least one of the lead in and lead out; A temporary defect management area provided in at least one of the lead-in and lead-out and in which temporary defect management information and temporary defect information are recorded at predetermined intervals; And A spare area provided in the data area to replace and record a defect found during reproduction; And in the temporary defect management area, TDMS information including at least one of information relating to a defect found during playback and its replacement, and information indicating a defect found during playback is updated and recorded at one time. The method of claim 11, And the TDMA information includes a field in which an SBM is recorded.