KR100739820B1 - Apparatus and method for managing defect - Google Patents

Abstract

Disclosed are a defect management apparatus and method.

A defect management apparatus according to the present invention includes a recording / reading section for recording or reading data on a recording medium, and reading data for replacing a defective area of the recording medium from a spare area of the spare area of the recording medium. Controlling the recording / reading portion to read out temporary defect information including a defect area and positional information about the replacement area from the temporary defect management area of the recording medium, and detecting the position information about the defect area from the replacement area. It characterized in that it comprises a control unit. Thereby, the defect information can be recovered even when the defect management ends abnormally.

Description

Apparatus and method for managing defect

1A and 1B are structural diagrams of a write once disc 100 having a temporary defect management area and a defect management area according to the present invention;

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

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

4 is a reference diagram illustrating a format of a data frame;

5 is a reference diagram showing a spare area of the disk 100 when defect management is abnormally terminated due to power down, etc.

6 is a reference diagram illustrating a process of recovering a spare bitmap SBM which is one piece of temporary management information;

7 is a flowchart for explaining a defect management method according to the present invention.

The present invention relates to defect management for a disc, and more particularly, to a defect management method, an apparatus and a disc for recovering when a defect management of a disc is abnormally terminated.

Defect management refers to supplementing data loss due to defect occurrence by rewriting user data recorded in a portion where a defect occurs when a defect occurs in the user data recorded in the user data area. 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 provided in the data 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 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 recording disc once, once data is written, it cannot be erased and written again, and thus defect management according to the conventional method is impossible.

Accordingly, the present applicant has filed a number of applications for a method, an apparatus, and a disk capable of managing defects by a drive for a recording disk having a property that cannot be erased and written once once data is recorded.

However, even when the drive manages fault management for the recording disc once, if the fault management ends abnormally due to an unexpected situation such as the power supplied to the drive goes down due to a power failure or the like, the fault will be There is a problem that management is not performed properly.

Accordingly, a technical problem of the present invention is to provide a method of managing defects, a device thereof, and a disk thereof so that failure management can be performed properly even after failure management by the drive is abnormally terminated due to an unexpected accident such as power down. To provide.

The technical problem according to the invention, (a) determining whether the defect management is properly terminated; (b) if it is determined that the defect management has not been completed properly, generating new defect information by reading information about the defect from the last recorded replacement area; And (c) updating the defect management information using the generated defect information.

Step (a) is preferably a step of checking whether the defect management is properly completed by checking the integrity flag.

The step (b) may include reading position information about the defect from the replacement area, or reading status information about the defect from the replacement area, or information about a previous defect. And generating the new defect information based on the information on the read defect.

The step (c) preferably includes recording new temporary defect information in the temporary defect management area.

In addition, the technical problem is a step of determining whether (a) defect management is properly completed; (b) if it is determined that the defect management has not been completed properly, scanning the portion where no data is recorded, indicated by the last recorded space bit map, and checking whether there is a portion where data is recorded; And (c) updating the SBM to reflect the newly confirmed, recorded portion of the data.

Step (c) preferably includes recording the updated SBM as temporary management information in the temporary defect management area.

On the other hand, according to another field of the invention, the technical problem is a disk having a lead-in area, a data area and a lead-out area, the spacing is disposed in the data area, the replacement area is provided to replace the defective area Fish area; A temporary defect management area provided in at least one of the lead-in area and the lead-out area to update and record information about a defect at a predetermined period; And a defect management area provided in at least one of the lead-in area and the lead-out area to record information about a defect last updated in the update area, wherein the replacement area is provided with information about the defect area. It is also achieved by a disc characterized by being recorded.

The information about the defective area preferably includes positional information of the defective area or includes state information of the defective area.

The information regarding the defective area is preferably recorded in the replacement area together with the data recorded in the defective area, ECC-encoded with the data recorded in the defective area and recorded in the replacement area or recorded in the defective area. It is particularly preferred that the ECC encoded data and the information regarding the defective area are recorded in the replacement area.

On the other hand, according to another field of the present invention, the technical problem is a pickup unit for recording or reading data on the disk; And recording or reading data by controlling the pickup unit to check the integrity flag to determine whether the defect management is properly terminated, and if it is determined that the defect management has not been terminated properly, to the defect from the last recorded replacement area. It is also achieved by an apparatus comprising a control unit for reading new information and generating new defect information, and updating defect management information using the generated defect information.

The control unit preferably reads position information on the defect from the replacement area or reads state information on the defect from the replacement area.

Preferably, the control unit generates the new defect information based on the information on the previous defect and the information on the read defect, and records the new temporary defect information in the temporary defect management area.

In addition, the technical problem is a pickup unit for recording or reading data on the disk; And determining whether or not defect management is properly terminated by recording or reading data by controlling the pickup unit, and when it is determined that defect management is not properly terminated, the data indicated by the last recorded space bit map is not recorded. It is also achieved by the apparatus characterized by including a control unit for scanning a portion which has not been recorded to check whether there is a portion in which data is recorded, and updating the SBM so that the newly identified portion in which the data is recorded is reflected.

The control unit preferably records the updated SBM as temporary management information in the temporary defect management area of the disk.

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

1A and 1B show the structures of the write once disc 100 having a temporary defect management area and a defect management area according to the present invention.

Referring to Fig. 1A, a disc 100 is a single recording layer disc having one recording layer L0, which includes a lead-in area, a data area and a lead-out area. The lead-in area is located on the inner circumferential side of the disk and the lead-out area is located on the outer circumferential side of the disk. The data area is located between the lead-in area and the lead-out area. The start and end of the data area are the same as those of the repeating recording disc, and are divided into a spare area, a user data area, and a spare area in order from the inner peripheral side of the disc. The user data area is an area where user data is recorded. The spare area is an area for supplementing the loss of recording space due to a defect in the user data area. The spare area is preferably set to ensure the maximum data capacity that can be recorded while allowing a defect on the disc. In addition, the location of the spare area may be variously determined. At least one of the lead-in area and the lead-out area is provided with at least one of a defect management area and a temporary defect management area.

Referring to FIG. 1B, in the case where the disk 100 is a dual recording layer disk having two recording layers L0 and L1, the lead-in area, the data area, and the outer area have an outer circumference at the inner peripheral side of the disk 100 in the recording layer L0. And the outer area, the data area and the lead-out area are sequentially arranged from the outer circumference side to the inner circumference side of the disc 100 in the recording layer L1. Unlike the single recording layer disc, the lead-out area is also arranged on the inner circumferential side of the disc 100. That is, the recording path for recording data is an OTP (Opposite Track Path) from the lead-in area of the recording layer L0 to the area outside of the recording layer L0, and then from the area outside of the recording layer L1 to the lead-out area of the recording layer L1. to be. Spare areas are allocated to recording layers L0 and L1, respectively.

In this embodiment, a spare area exists between the user data area and the lead-out area or the outer area, but one between the lead-in area and the lead-out area by utilizing a separate space obtained by dividing the user area as necessary. Of course, two or more may be arranged.

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

Referring to FIG. 2, 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 section 1 records data on the disk 100, which is an information storage medium according to the present embodiment, and reads data to verify the recorded data.

The control unit 2 performs defect management according to the present invention. In the present embodiment, the control unit 2 performs defect management according to the "verify after write method" in which the defect is found by recording data in predetermined units and then verifying the recorded data. In the present embodiment, the control unit 2 records the user data in a predetermined unit and then verifies where the defective area occurs, replaces the defective area found as a result of the inspection with a new area, and then informs where the defective area and the replacement area are. Generates information, stores it in the memory unit 3, collects a predetermined amount, and writes it to the temporary defect management area TDMA provided in the disk 100. FIG. The information recorded in the temporary defect management area is referred to as temporary management information TDMS corresponding to management information for managing defects recorded in the defect management area DMA. The temporary management information is composed of temporary defect information indicating where the defective area and the replacement area are located, and temporary defect management information for managing the temporary defect information. In particular, in the present embodiment, the space bit map SBM for distinguishing the used area from the unused area of the disc is recorded as one of the temporary defect management information.

In case the temporary management information is not updated due to an unexpected situation such as a power down even though the defective area is replaced with the replacement area, the replacement area can be properly restored even later according to the present invention. Records information about the defect area together. The information on the defective area includes positional information and status information of the defective area. For example, a new cluster, which is recorded by replacing a defective cluster, that is, a replacement cluster, also records information about the defective cluster. The information on the defective cluster has location information and status information of the defective cluster. Defects generated during recording include defects generated during recording and defects generated during verification. The location information for the defective cluster is address information. For example, if the defective cluster is located across several consecutive PSNs, the first PSN is recorded. The location information has a byte size that can represent the address of the entire disk. Approximately 4 Bytes is enough. The status information for the defective cluster indicates whether the user data recorded in the defective cluster and the user data replaced in the replacement cluster are the same data, or indicate whether the generated defect is a complete defect or an incomplete defect. A complete defect is a defect that cannot be read because the data is completely destroyed and error correction is impossible. An incomplete defect is a defect that is error corrected but is highly likely to be incorrectly corrected afterwards. In the case of a complete defect, the data recorded in the replacement cluster may not be exactly the same as the data recorded in the defective cluster. For example, when recording high continuity data, if a complete defect occurs, data that is supposed to have been recorded in the defective cluster may be recorded instead in the replacement cluster.

When the user completes recording of the predetermined data and then presses an eject button (not shown) provided in the apparatus to eject the disc 100, the control unit 2 predicts that one recording operation will be terminated. When it is predicted that the recording operation will be finished, the control section 2 reads out the defect information stored in the memory section 3, provides it to the recording / reading section 1, and instructs the recording of the information into the temporary defect management area. Thus, the temporary management information is updated for each recording operation. Alternatively, the temporary management information can be updated each time recording of the predetermined recording unit ends.

In addition, in case the temporary management information is not updated due to an unexpected situation such as a power down even though the defective area is replaced with the replacement area, the temporary management information can be properly restored even later according to the present invention. The control unit 2 sets an integrity flag in recording the temporary management information in the temporary defect management area. The integrity flag informs the start of updating of the temporary management information (e.g., set the integrity flag = 1), and finally, if the recording of a predetermined recording unit has ended or the recording operation is completed and the disc 100 needs to be ejected from the drive, finally While updating the management information, the integrity flag is reset (eg integrity flag = 0) to indicate that the update was successful.

When recording of the next recording unit starts or the disc is reloaded, the control unit 2 checks the integrity flag. If the status of the integrity flag is 1, it is determined that the recording operation of the disk has abnormally terminated and recovery of temporary management information and other additional information is started. That is, information about the defective area is read from the last replaced area and based on this, the temporary management information and other additional information are updated. A detailed description will be described later.

When data recording is completed on the disc 100, that is, when no further data is to be recorded on the disc 100 (when finalizing), the control unit 2 records the temporary management information recorded on the disc 100. The most recently updated information is recorded in the defect management area provided on the disc 100.

Similarly, in the case where a defect occurs during replacement and replacement, information on the defect area is also recorded in the replacement area. For example, the location information of the defective cluster (for example, the first PSN of the defective cluster) and the status information are recorded together in the alternate cluster.

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

Referring to FIG. 3, 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.

In recording, the PC I / F 21 receives a recording command from the host (not shown) along with data to be recorded. The SYSTEM CONTROLLER 25 performs the initialization required for recording. The DSP 22 adds additional data such as parity to the data to be recorded received by the PC I / F 21 for error correction, performs ECC encoding, and then modulates the ECC encoded data in a predetermined manner. The RF AMP 23 converts the data output from the DSP 22 into an RF signal. The pickup 10 records the RF signal output from the RF AMP 23 on the disk 100. The SERVO 24 receives a command necessary for servo control from the SYSTEM CONTROLLER 25 and servo controls the pickup 10. In addition, the SYSTEM CONTROLLER 25 instructs to read the recorded data to the pickup 10 in order to perform defect management according to the present invention at the time of recording or to record predetermined information such as temporary management information.

In more detail, the SYSTEM CONTROLLER 25 records the predetermined number of clusters and then verifies the area again. If a defect is found, the position of the defect cluster and the state of the defect are stored in the memory unit 3, and at the end of the verification of the unit of work or when the defect is found, the user from the host together with the recording command of the host. From the memory unit 3 storing the data, the user data corresponding to the position of the found defective cluster is taken out, and the replacement is performed by attaching the position information and the defect state information of the defective cluster to the replacement cluster.

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 may instruct the pickup 10 to read information necessary for defect management during reproduction.

In more detail, the SYSTEM CONTROLLER 25 performs a replacement for incomplete defects found while reading data to perform playback according to the playback command of the host even after the playback according to the playback command of the host is completed or during playback. If it is determined that the margin is sufficient, the user data recorded in the defective cluster is reproduced, and then information on the defective cluster is added and recorded in the replacement cluster. The user data that was recorded in the defect cluster and the information about the defect cluster may be recorded together after ECC encoding, or may be recorded together with the information about the defect cluster after only user data has been ECC encoded.

An example implementation of a record in preparation for recovery is as follows.

1. According to U.S 6367049, the ECC format consists of an ECC Cluster consisting of 304 Long Distance Reed-Solomon error correction codes and a BIS Cluster consisting of 24 Burst Indicator Subcodes (BIS). In the process of creating a BIS cluster, a portion of the control data may be allocated to a field in which information on the above-described defect cluster is recorded according to the present invention.

In more detail, in the structure of recording data in ECC format of the present invention US 6367049, a memory unit (3) storing user data from the host by a recording command of the host when a defect occurs and is replaced during a verification process after recording. The user data corresponding to the location of the defective cluster is encoded into the ECC cluster, and 16 physical addresses of the replacement cluster and the portion of the control data allocated for the location information and status information of the defective cluster are assigned to the defective cluster. The control data including the physical address is encoded into the BIS cluster to make it into a physical cluster and recorded in the alternate cluster.

2. For defects that occurred during playback by the playback command of the host under the structure in which data was recorded in ECC format of US 6367049, if the defective cluster is replaceable, that is, incomplete defects, the defective cluster is regenerated to reproduce ECC Cluster and BIS. The user data obtained by error correction of the cluster is encoded into the ECC cluster, and the 16 physical addresses of the replacement cluster, the location information of the defective cluster and the position of the control data allocated for the defect status information are assigned to the physical address of the defective cluster. Control Data including defect status information is encoded into BIS Cluster to make it into Physical Cluster and then recorded in the Alternate Cluster.

There are 16 data frames in one ECC block. Each Data frame has the structure of FIG. Referring to FIG. 4, 6 bytes of reserved (RSV) left as a reserved area indicates position information of a defective cluster when the user data recorded in a defect generated during recording, verification or playback is to be replaced by an alternative cluster of the spare area. It is used as an area to record status information.

3. DVD-RAM can manage the defect by the drive. The ECC format uses Reed_Solomon Product Code (see Data Format of the DVD-RAM Specification). Therefore, the present invention can be applied not only to DVD-RAM but also to an information storage medium for recording data using the RSPC code of the DVD.

4. When a defect occurs under a disk structure having a linking area between the recording unit and the recording unit and replaces, the position information and the state information of the defective cluster are stored in the linking area of the replacement cluster. In order to increase the reliability of the data, it is preferable that the position information and the state information of the defect cluster recorded in the linking area are recorded in an error correction structure to enable error correction.

The process of recovering the temporary management information recorded in the temporary defect management area is as follows.

5 shows a spare area of the disk 100 when defect management is abnormally terminated due to power down.

Referring to Fig. 5, the spare cluster replaces the defective cluster in the spare area. In general, the spare area is sequentially replaced in a direction in which its physical sector number increases. However, if necessary, the replacement may be performed in the opposite direction. The alternate cluster is divided into that the information is updated with temporary management information in the temporary defect management area and that it is not. Updated means that defect management has ended normally. The presence of something else means that defect management has not been terminated normally, so recovery work is needed later.

6 shows a process of recovering a spare bit map SBM, which is one piece of temporary management information.

Referring to FIG. 6, (a) shows the recording state of the disk 100 shown on the SBM before recovery in the case where the defect management cannot be completed normally and the recovery operation is required, and (b) shows the recording of the actual disk 100. Indicates the state. The black squares indicate the parts where data was recorded, the gray squares indicate the parts where data was actually recorded but the data was not recorded on the SBM before recovery, and the white squares indicate the parts where no data was recorded. As such, if defect management is not terminated normally, the SBM may not properly reflect the updated recording status.

The disk 100 is inserted into the drive and the drive checks the integrity flag written on the disk 100, so if the integrity flag is '1', the drive is written to the temporary defect management area of the disk 100 immediately before use. It is found that the management information cannot be updated and the disk 100 has been ejected.

In order for the SBM to properly show the current recording state of the disc 100, the drive scans the unrecorded portion indicated by the SBM to check whether the data is actually recorded, that is, additionally the data is recorded. That is, as described above, since the SBM is a disc recording state map indicating the presence or absence of recording of each cluster in the physical recordable area of the disc 100 as a bit value, the drive is not currently recorded from the SBM, and the entire portion of the disc shown as empty is not recorded. After scanning, it confirms whether data is recorded and then creates a new SBM reflecting the newly recorded area after the current SBM. The updated SBM is recorded in the temporary defect management area as temporary management information, thereby completing the recovery of the SBM.

(c) shows the recording state of the disc 100 indicated by the new SBM, which correctly reflects (b). The drive adds the bit values for the recovered portion (the newly written portion) to the existing SBM to make the updated SBM.

7 is a flowchart for explaining a defect management method according to the present invention.

Referring to FIG. 7, once the recording disc is implemented in the drive that implements the defect management by the drive, the drive reads the temporary management information in the temporary defect management area and stores the temporary management information in the memory unit 3 for recording / reproducing. The initialization process is performed (step 701). If the mounted disk is not a blank disk, the drive will look at the setting value of the recorded integrity flag C_flag, which is included in the temporary defect management information in the temporary defect management area, to determine whether the disk has been updated with defect information normally in the previous use. (C_flag = '1' is abnormal, C_flag = '0' is normal) (step 702). If the defect information is not updated normally, the temporary defect information of the temporary management information stored in the memory unit 3 is checked to determine the location of the last replaced area in the spare area, and then the replacement recorded in the area after the identified location. The data recorded in the cluster is reproduced to find out the position information and the defect state information of the defective cluster (step 703). Based on the found information, a defect list for the defect cluster and the replacement cluster is created (step 704), and new defect information is generated based on the created list and the previous temporary defect information (step 705). Update the process (step 706).

An implementation of recovery looks like this:

1. When data is recorded in the ECC format of US 6367049 and the physical address and defect status information of the defect cluster are recorded in the replacement cluster during the above-described defect management operation, the spare is referred to by referring to the temporary defect information of the temporary management information. Find the last updated replacement cluster in the zone, and then read the data recorded in the replacement clusters that have been recorded since then, to correct the BIS Cluster of the replaced physical cluster, and to correct the physical address of the defective cluster in the control data. Obtains defect status information, creates defect lists for the defective clusters and replacement clusters, and creates the defect lists and the temporary management information already read when the disk is mounted and stored in the memory unit 3 on the basis of the last temporary defect information. Create new temporary defect information. If there is information to be updated among the information to be recorded in the temporary management information, it is updated together and recorded as temporary management information in the temporary defect management area.

The above-described recovery method can be applied to the rewritable disc as well as the write disc once. There is only a difference in the update process according to the characteristics of the medium.

2. In the case of recording in the RSPC format of the DVD and recording the physical address and defect state information of the defective cluster in the replacement block, the replacement block last updated in the spare area is referred to by referring to the temporary defect information of the temporary management information. After retrieving and reproducing the data recorded in the replacement block recorded thereafter, and correcting the error, the position information and the defect state information of the defect cluster recorded in the reserved area RSV of FIG. The defect list for the replacement cluster is made and new temporary defect information is created based on the final temporary defect information as temporary management information which has been created and stored in the memory unit 3 when the disk is mounted. If there is information to be updated among the information to be recorded in the temporary management information, it is updated together and recorded as temporary management information in the temporary defect management area. This can also be applied to rewritable discs as well as to write-once discs. There is only a difference in the update process according to the characteristics of the medium.

3. Similarly, when the location information and the defect status information of the defect cluster are recorded in the linking area, the temporary cluster information updated in the spare area is found by referring to the temporary defect information of the temporary management information. Reads the data corresponding to the data from the linking area, obtains the location information and the defect status information of the defect cluster, creates a defect list, and creates the defect list and the temporary list already read and stored in the memory unit 3 when the disk is mounted. As management information, new temporary defect information is created based on the final temporary defect information. If there is information to be updated among the information to be recorded in the temporary management information, it is updated together and recorded as temporary management information in the temporary defect management area. This can also be applied to rewritable discs as well as to write-once discs. There is only a difference in the update process according to the characteristics of the medium.

The above-described defect management method (recording process and recovery process for recovery) can be applied not only to a recording disk but also to a repeating recording disk. The recording disc once provided a defect management area and a temporary defect management area for defect management. However, since a repeatable recording disc can be repeatedly recorded, a temporary defect management area is not necessarily required. However, even in the case of the write once disc, the defect management area is disposed at the same position as the repeating recording disc for compatibility with the repeat recording disc, and the final temporary management information of the temporary defect management area is recorded in the defect management area during finalizing.

As described above, according to the present invention, it is possible to recover, among other things, temporary defect information among the temporary management information of the temporary defect management area. Even in the case of a repeating recording disc, it is possible to recover defect information recorded in the defect management area. In other words. Even if a defect occurs during recording / playback to / from a recording disc (repeat recording disc) once and the replacement cluster has been replaced by the replacement cluster, the system may be suddenly shut down or for other reasons. Even when the defect information is not updated and the disk is ejected from the drive, the temporary defect information (defect information) of the temporary defect management area (defect management area) can be restored. In addition, the SBM may be restored even when the SBM is not properly updated.

In particular, the present invention is particularly easy to apply to a drive whose power cut is checked. Even if the drive is unable to perform a power down check, the drive itself may perform the write and restore according to the present invention at the command of the host or when the disc is inserted.

Claims (11)

A recording / reading unit for recording or reading data on a recording medium; Reads data for replacing a defective area of the recording medium from a spare area of the spare area of the recording medium, and manages temporary defect information of the recording medium with temporary defect information including position information about the defective area and the replacement area; And a control unit for controlling the recording / reading unit to read from the area, and detecting the positional information about the defective area from the replacement area. The method of claim 1, The control unit And control the recording / reading unit to read the temporary defect information from a temporary defect management area formed in at least one of a lead-in area and a lead-out area of the recording medium. . The method of claim 1, The control unit And control the recording / reading unit to read the last recorded temporary defect information from the temporary defect management area when the recording medium is finalized. The method of claim 1, The control unit And a recording medium for controlling the recording / reading unit to read temporary defect information last recorded in the temporary defect management area from a defect management area (DMA) provided in at least one of a lead-in area and a lead-out area. Device for managing defects on the screen. The method of claim 1, The control unit And detecting status information on the defective area from the replacement area. The method of claim 5, And the position information and the state information are ECC encoded together with the data recorded in the replacement area. In the method for managing a defect on a recording medium, Reading out data of the spare area for replacing the defective area of the recording medium from the spare area; Reading out temporary defect information including positional information about the defect area and the replacement area from the temporary defect management area of the recording medium; And detecting positional information about the defective area from the replacement area. The method of claim 7, wherein And reading out the temporary defect information from a temporary defect management area provided in at least one of a lead-in area and a lead-out area of the recording medium. The method of claim 7, wherein If the recording medium is finalized, reading out temporary defect information last recorded in the temporary defect management area from a defect management area (DMA) of the recording medium. On how to manage defects. The method of claim 7, wherein And detecting status information regarding the defective area from the replacement area. The method of claim 10, Wherein the position information and the state information are ECC encoded together with ECC encoding of data to be recorded in the replacement area.

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