KR20230123142A - Optical disc recording method - Google Patents

Abstract

This specification relates to an optical disc recording method. An optical disk recording method according to an embodiment includes the steps of dividing a data area of an optical disk in which requested data is to be recorded into N sections that are natural numbers equal to or greater than 2; The data corresponding to each section of the first section to the Nth section is recorded sequentially, but at the end of each section, information on the starting position of the data recorded in the section, information on the amount of data recorded in the section, and the corresponding section are recorded. recording a bookmark including updated disk management information including information related to the generated defect; and recording updated disc management information in the lead-in area when recording of the N-th section ends.

Description

Optical disc recording method}

This specification relates to an optical disk recording method, and more particularly, to a method of dispersively recording data on an optical disk.

Optical disc devices capable of playing or recording optical discs such as CD (Compact Disc), DVD (Digital Versatile Disc), and BD (Blu-ray Disc) capable of recording and storing data are used in desktop computers (PCs) or laptops. It is used as a peripheral device of a computer.

The need for large-capacity servers to store and manage large amounts of data in portals that provide cloud services, broadcasting stations that provide a large amount of content, libraries, government offices, banks, and hospitals that need to archive and store a large amount of documents. this is increasing In accordance with this need, an archive system capable of reliably storing and quickly searching a large amount of data at a low cost has been released.

An archive system is a type of database that converts and stores collections or data into digital information and maintains and manages the relationship between materials. It is a system that enables use, etc. It is meaningful not to simply accumulate information, but to systematize and accumulate information so that it can be used efficiently in various ways.

Until now, archive systems that use tape as a storage medium have mainly been used. However, although the tape-based archive system has excellent data stability, there is a problem in that the speed of retrieval is low and a large amount of space is occupied. A hard disk-based archive system is also emerging, and it is excellent in that it can be searched quickly, but it has a problem of poor data stability.

Recently, an archive system that records data by connecting a plurality of optical disk devices using a high-capacity optical disk as a storage medium is being developed. Compared to the base archive system, it has the advantage of being able to store data stably, and has the advantage of reducing the space occupied compared to tapes or hard disks.

In an optical disk-based archive system, when a recording failure occurs due to external factors such as power supply instability or a disk failure while data is being recorded on an optical disk, the optical disk is discarded and data is re-recorded on a new disk. However, since high-capacity disks such as 100 GB or 200 GB are used in archive systems, and high-capacity optical disks are expensive, an efficient disk recording method is required in preparation for recording failure.

This specification takes this situation into account, and its object is to provide an efficient method for managing the recording of high-capacity optical discs.

A specific object of this specification is to provide a method for using previously recorded data when recording failure occurs during recording of an optical disc.

An optical disk recording method according to an embodiment for realizing the above object includes dividing a data area of an optical disk in which requested data is to be recorded into N sections that are natural numbers equal to or greater than 2; The data corresponding to each section of the first section to the Nth section is recorded sequentially, but at the end of each section, information on the starting position of the data recorded in the section, information on the amount of data recorded in the section, and the corresponding section are recorded. recording a bookmark including updated disk management information including information related to the generated defect; and recording updated disc management information in the lead-in area when the recording of the N-th section is finished.

An optical disk device according to another embodiment includes a spindle motor for rotating an optical disk, an optical pickup for focusing light on an optical disk, a sled motor for moving the optical pickup in an inner/outer circumferential direction of the optical disk, and an optical pickup. , a recording/reproducing unit for driving the sled motor and the rotary motor and processing servo signals and recording/reproducing data; and a control unit for controlling the recording/reproducing unit, wherein the control unit divides the data area of the optical disc into which the requested data is to be recorded into N sections, which are natural numbers equal to or greater than 2, and controls the recording/reproducing section to start from the first section. The data corresponding to each section of the N-th section is recorded sequentially, but at the end of each section, information on the start position of the data recorded in the section, information on the amount of data recorded in the section, and defects generated while recording the section A bookmark including updated disc management information including related information is recorded, and the updated disc management information is recorded in the lead-in area when recording of the Nth section is finished.

Accordingly, even when a failure occurs during data recording, part of the data recorded on the corresponding optical disc can be reproduced again.

1 shows an area of a disk on which data is recorded when data is continuously recorded on a conventional optical disk;
2 shows the form of data recorded in the lead-in area and data area of an optical disc when data is distributed and recorded on an optical disc according to an embodiment of this specification;
3 shows a configuration of bookmarks recorded on an optical disk when data is distributed and recorded on the optical disk according to an embodiment of this specification;
4 shows an optical disk device to which the data recording method according to this specification is applied as functional blocks;
5 is an operational flowchart of a method of dispersively recording data on an optical disc according to an embodiment of this specification.

Hereinafter, an embodiment of an optical disk recording method will be described in detail based on the accompanying drawings.

1 shows an area of a disk where data is recorded when data is continuously recorded on a conventional optical disk.

As shown in FIG. 1, an optical disc has a data area in which user data is recorded, a lead-in area in which control data necessary for reproducing data recorded in the data area is stored, and An area in which data is recorded may be divided into a lead-out area in which control data is additionally stored by assisting the lead-in area.

For example, when data is recorded on a write-once optical disc such as BD-R, information related to the data requested to be written first, for example, the start address and data of data to be recorded in one recording operation (session) TDMA (Temporary Disc Management Area) information including the amount is recorded in the TDMA of the lead-in area, then the requested data is recorded in the data area, and TDMA information for the data recorded in the data area is recorded in the TDMA of the lead-out area. and additionally record TDMA information for the data recorded in the data area into the TDMA in the lead-in area.

When the recording of the data area is finished and the corresponding disc is closed (finalization), the TDMA information recorded in the TDMA of the lead-in area is organized into disc management information and recorded in a DMA (Disc Management Area).

A data section recorded in one recording operation can be expressed as a session. When recording one session, TDMA information related to the session, that is, information on the starting position to record the data of the corresponding session and data to be recorded in the corresponding session TDMA information including data amount information is written twice in the TDMA of the lead-in area.

First, in the TDMA of the lead-in area, start position information for recording the data of the session and information on the amount of data to be recorded in the session are recorded as start TDMA information, and then, the data of the corresponding session is recorded in the data area, After the end of data recording, information on the start position of data recorded in the corresponding session, information on the amount of recorded data, and information related to defects that occurred while recording the corresponding session are recorded again as update TDMA information in the TDMA of the lead-in area. . Update TDMA information may be additionally recorded in the lead-out area.

When an optical disc is played back, when the disc is closed, the disc management information recorded in the DMA of the lead-in area is first read and based on this, data requested by the host can be read from data recorded in the data area. If the corresponding disk is not closed, update TDMA information among the TDMA information recorded in the TDMA of the lead-in area can be read, and based on this, requested data can be read from the data area.

When the DMA or TDMA in the lead-in area is damaged, the optical disk device can read the TDMA or DMA additionally recorded in the lead-out area and read requested data from the data area based on this.

However, if recording failure occurs during data recording on an optical disc due to unstable power supply or disc failure, update TDMA information is not recorded in the TDMA of the lead-in area, and thus the data on the disc cannot be used at all. An archive system that records data on an expensive and high-capacity optical disc has no choice but to discard the failed disc and re-record the data on a new optical disc.

This specification proposes a method of enabling use of some already recorded data even if a recording failure occurs during data recording, considering that an optical disk having a recording failure in an archive system is high-capacity and expensive.

To this end, in the recording method according to an embodiment of this specification, the entire capacity of an optical disc is divided into uniform sections and recorded, and after data is recorded in each section, a bookmark for the section is recorded in the data area. can The bookmark may include information on the last address at which data of a corresponding section is recorded, TDMA information on a corresponding section, information on a start address where data of a next section is to be recorded, and the like.

First, a brief look at TDMA.

TDMA (Temporary Disc Management Area) is an area for storing information (TDMA information) necessary for disc defect management and recording management, and is recorded in a lead-in area and a lead-out area.

The TDMA is an area where management information is recorded when a process of ejecting a disc is repeated after recording a small amount of data or repeatedly updating a defect list.

When the data section recorded in one recording operation is expressed as a session, TDMA information is recorded twice or three times for one session. After starting TDMA information is recorded in the TDMA and data of the corresponding session is recorded in the data area, update TDMA information can be recorded in the TDMA of the lead-in area. Update TDMA information may be additionally recorded in the TDMA of the lead-out area.

The start TDMA information includes information on the start address of a recording-requested session and information on the amount of data requested to be recorded, and the update TDMA information includes information on the start address of a recorded session, information on the amount of recorded data, and defects occurred while recording the corresponding session ( Defect) information may be included.

TDMA information is composed of an indicator cluster and a temporary disc management structure (TDMS). The indicator cluster contains information for finding the TDMA information being used last, and the TDMS records continuously according to the recording mode. In sequential recording mode, it consists of TDDS (Temporary Disc Definition Structure), TDFL (Temporary Defect List) and SRRI (Sequential Recording Range Information), and in random recording mode, TDDS, TDFL and SBM (Space Bit Map) ) is composed of

When a disk is ejected after the requested session data is recorded, TDMA information must reflect the state of the final disk, so when recording updated TDMA information, TDFL, SRRI or SBM must be recorded according to the recording mode.

Therefore, when an optical disk is inserted and the optical disk is recognized, the optical disk device can find and access the final TDMA location based on the indicator cluster information in the TDMA, and then check the current data state.

Also, a BD disc may include a plurality of recording layers, and a triple layer (TL) BD disc may include three TDMAs. That is, the TDMA of the 3-layer disc can be composed of TDMA 0 in the lead-in area of layer 0, TDMA 1 in the lead-in area of layer 1, and TDMA 2 in the lead-in area of layer 2, respectively. Cluster), and since one physical cluster is 64KB, each TDMA capacity is 128MB.

Similarly, a quadruple layer (QL) BD disc may include four TDMAs, and each layer may have a different TDMA size.

FIG. 2 shows the form of data recorded in the lead-in area and data area of an optical disc when data is distributed and recorded on an optical disc according to an embodiment of this specification, and FIG. It shows the configuration of bookmarks recorded on an optical disk when data is distributed and recorded on the disk.

In the distributed recording method according to the embodiment of this specification, the entire recording capacity of a disk is divided into a predetermined number of sections, for example, N sections, and data is recorded in units of each section, but bookmarks for the section are marked each time the recording of a section ends. is recorded, so that even if a recording failure occurs due to an external factor during recording of the n-th section, the data recorded up to the (n-1) section can be used.

2 shows that when data is recorded in the entire data area, the data area is divided into N sections, and data is sequentially recorded in each section.

For the first section, start TDMA information for the first section is first recorded in the TDMA of the lead-in area, data is recorded in the data area corresponding to the first section, and then bookmarks for the first section are placed at the end of the first section. (1 ^st BookMark), and then, in the TDMA of the lead-in area, update TDMA information for the data recorded in the first section is created and recorded. In FIG. 2, the start TDMA information and update TDMA information for the first section are 1 It is expressed as ^st TDMA.

Then, the start TDMA information for the second section is recorded in the TDMA of the lead-in area, data is recorded in the data area corresponding to the second section, and a bookmark (2 ^nd BookMakr) for the second section is set at the end of the second section. Then, update TDMA information for the data recorded in the second section is generated and recorded in the TDMA of the lead-in area. The start TDMA information and the update TMDA information for the second section are 2 ^nd TDMA.

Similarly, while recording start TDMA information, data recording, bookmark recording, and update TDMA information for the n-th section, start TDMA information recording and data recording operations are performed for the N-th section corresponding to the last section, and then the bookmark is recorded. Update TDMA information can be recorded without recording.

Optionally, after data recording for the N-th section is finished, updated TDMA information generated from the first section to the N-th section may be additionally recorded in the TDMA of the read-out.

Since all data has been recorded in the data area, it is advantageous to close the optical disc. In this case, DMA information can be generated based on the first through N-th updated TDMA information and recorded in the DMA in the lead-in area.

The bookmark is recorded in the data area after data recording for each section is finished. The bookmark ((N-1)th BookMark) for the (N-1)th section is, as shown in FIG. 3, (N-1) (N-1)th LRA (Last Recorded Address), which is the last recorded address of the 1)th section, updated TDMA information on the data record of the (N-1)th section ((N-1)th updated TDMA) and the next section may include Nth Next Writable Address (NWA), which is the start address of the N-th section.

In this way, by dividing the data area into a plurality of sections and recording the bookmarks after each section is recorded, it is possible to obtain TDMA information for reading previously recorded data from the disk even if a recording failure occurs, and thus, previously recorded data can be saved. become available

For example, if a recording failure occurs while recording data, bookmarks, or updated TDMA information for the second or later section, for example, the nth section, the data recorded up to the (n-1)th section can be used. there will be

4 shows an optical disk device to which the data recording method according to this specification is applied as functional blocks.

The optical disk device 100 includes a spindle motor 11, a sled motor 12, and an optical pickup 20 that writes data to or reads data from the optical disk 10 using a laser beam. , a recording/reproducing unit that drives the spindle motor 11, the sled motor 12, and the optical pickup 20 and processes servo signals and recording/reproducing data, a control unit 70 that controls the recording/reproducing unit, and an external It may include an interface unit 80 that communicates with the host, receives a data transmission command from the host, and transmits data read from the optical disk to the host.

The recording/reproducing unit may include a light driving unit 30, a digital signal processing unit 40, an R/F unit 50, a servo/driving unit 60, and the like. The optical driver 30 may be included in the optical pickup 20 . A light driving unit 30 and a servo/driving unit 60 or a control unit 70 may be further included to be referred to as a driving circuit.

The digital signal processor 40 adds an error correction code (ECC) to input digital data and converts it into a recording format. The light driver 30 outputs a light quantity driving signal corresponding to the input signal. The optical pickup 20 records data on the optical disk 10 or reads data from the recording surface of the optical disk 10 according to the light quantity driving signal.

The optical driver 30 outputs a recording pulse signal for forming marks on the recording surface to the laser diode of the optical pickup 20 when data is written on the disk, and when data is read from the disk, the optical driver 30 outputs a recording pulse signal for forming marks on the recording surface. The level value is output to the laser diode of the optical pickup 20.

The R/F unit 50 filter-shapes the signal detected by the optical pickup 20 and outputs it as a binary signal, and also generates and outputs a tracking error signal (TE), a focus error signal (FE), and an RF signal.

The digital signal processor 40 restores the binary signal to original data with its own clock phase-synchronized with the binary signal.

The servo/drive unit 60 generates servo signals necessary for focusing servo (including recording layer access servo), tracking servo, sled servo, and spindle servo based on the signals from the R/F unit 50, and the optical disc ( 10) drives the spindle motor 11 that rotates the optical pickup 20, drives the sled motor 12 that moves the optical pickup 20 in the inner and outer circumferential direction, and also drives the focusing servo of the objective lens in the optical pickup 20 and It drives the current required for the tracking servo.

The controller 70 controls each element to write data to or read data from the optical disk, and controls the optical drive unit 30 to read data from the optical disk 10 to the optical pickup 20. The laser diode in the optical disc is driven with power for reproduction or the laser diode is driven with power for recording to record data on the optical disk 10 .

In addition, the controller 70 controls the servo/drive unit 60 based on the RF signal detected by the optical pickup 20 and output from the R/F unit 50 and the error signal to drive the spindle motor 11. The disk 10 is rotated at a desired speed through a sled motor 12, the optical pickup 20 is moved to a desired position, and a current is applied to an actuator supporting an objective lens in the optical pickup 20. It performs focusing servo and tracking servo.

The interface 80 may be a USB interface, a Serial ATA (SATA) interface, or the like, and exchanges data or commands by connecting the host and the optical disk device 100 .

5 is an operational flowchart of a method of dispersively recording data on an optical disc according to an embodiment of this specification.

When a data recording request is received from the host, the controller 70 divides the data area in which the requested data is to be recorded into a predetermined number of sections, for example, N (a natural number equal to or greater than 2) (S510). When the capacity to fill all of the data area is divided into N sections, and when the requested data is not the capacity to fill the entire disk, the data area to the address where the requested data is to be written can be divided into N sections.

The control unit 70 sequentially records the data divided into the first section to the N-th section. When the data of each section is recorded, the controller 70 first generates start TDMA information related to the data to be recorded in the section and records it in the TDMA of the lead-in area (S520). The start TDMA information is the data of the section. It may include start position information to be recorded and information on the amount of data to be recorded in the corresponding section.

Thereafter, the controller 70 controls the servo/drive unit 60 to move the optical pickup 20 to the starting position of the corresponding section, and controls the optical drive unit 30 and the servo/drive unit 60 to move the optical pickup 20 from the moved position. Data of the corresponding section is recorded (S530). If a disk defect is found during data recording, the corresponding location can be defect-processed.

When all the requested data is recorded in the corresponding section, the control unit 70 determines the bookmark for the corresponding section, that is, updated TDMA information for the data recorded in the corresponding section, information on the last address where the data in the corresponding section is recorded, and the next section. A bookmark including start address information where data is to be recorded may be created and recorded at the end of the corresponding section (S540).

The updated TDMA information for the data recorded in the corresponding section may include start position information of the data recorded in the corresponding section, information on the amount of data recorded in the corresponding section, and information related to defects generated while recording the corresponding section. .

Bookmark recording can be omitted for the last section. If the requested data is the capacity to fill the entire disk and the last section reaches the end of the data area and the corresponding disk is closed, bookmark recording for the last section can be omitted. Alternatively, when the requested data does not have the capacity to fill the entire disk, bookmarks may be recorded for the last section as well.

Thereafter, the controller 70 controls the servo/driver 60 to move the optical pickup 20 to the TDMA in the lead-in area, and records updated TDMA information generated for the corresponding section (S550).

The control unit 70 repeats S520 to S550 for each section until the recording of the last section ends (S560). When the recording of the last section is finished (YES in S560), each section is assigned to TDMA in the lead-in area. Start TDMA information and update TDMA information for each section are recorded, and at the end of each section, a bookmark for the corresponding section is recorded.

The control unit 70 controls the servo/drive unit 60 to move the optical pickup 20 to the lead-out area, and transmits updated TDMA information for each section from the first section to the N-th section to the TDMA in the lead-out area. (S570), but this step may be omitted.

When no more data is recorded on the corresponding disk, the control unit 70 generates data management information based on the updated TDMA information for each section from the first section to the N-th section and stores it in the DMA of the lead-in area. After recording, the disc is closed (S580).

Therefore, for example, data corresponding to the n-th section, that is, start TDMA information for the n-th section, data to be recorded in the n-th section of the data area, bookmark to be recorded at the end of the n-th section, or n-th section of the data area Even if a recording failure occurs while recording the updated TDMA information for the data recorded in the section, since the updated TDMA information or bookmark from the first section to the (n-1) th section is recorded properly, the disk is not discarded, (n Up to the -1)th section, the data of the corresponding disk can be reproduced using updated TDMA information or bookmarks.

Even if a failed disk is inserted during recording, the control unit 70 can read the properly recorded updated TDMA information from the TDMA in the lead-in area and reproduce or read data up to the section corresponding to the last updated TDMA information based on this. .

In addition, even if recording failure occurs when recording the update TDMA information for the n-th section, the starting TDMA information for the n-th section, the bookmark for the (n-1)-th section, and the bookmark recorded at the end of the n-th section Data recorded in the n-th section of the data area can also be properly reproduced or read by using .

The optical disc recording method described in this specification can be explained as follows.

An optical disk recording method according to an embodiment includes the steps of dividing a data area of an optical disk in which requested data is to be recorded into N sections that are natural numbers equal to or greater than 2; The data corresponding to each section of the first section to the Nth section is recorded sequentially, but at the end of each section, information on the starting position of the data recorded in the section, information on the amount of data recorded in the section, and the corresponding section are recorded. recording a bookmark including updated disk management information including information related to the generated defect; and recording updated disc management information in the lead-in area when recording of the N-th section ends.

In one embodiment, the bookmark may further include information about the last address where the data of the corresponding section is recorded and information about the start address where the data of the next section is to be recorded.

In one embodiment, the step of sequentially recording data corresponding to each section is recorded in the corresponding section of the data area, prior to recording start position information of data to be recorded in the corresponding section in the lead-in area and data corresponding to the corresponding section. The method may further include recording start disc management information including data amount information.

In one embodiment, the optical disc recording method may further include the step of re-recording the updated disc management information recorded in the lead-in area to the lead-out area.

In one embodiment, the optical disc recording method may further include generating disc management information based on updated disc management information recorded in the lead-in area and recording the disc management information in the lead-in area when the optical disc is closed.

An optical disk device according to another embodiment includes a spindle motor for rotating an optical disk, an optical pickup for focusing light on an optical disk, a sled motor for moving the optical pickup in an inner/outer circumferential direction of the optical disk, and an optical pickup. , a recording/reproducing unit for driving the sled motor and the rotary motor and processing servo signals and recording/reproducing data; and a control unit for controlling the recording/reproducing unit, wherein the control unit divides the data area of the optical disc into which the requested data is to be recorded into N sections, which are natural numbers equal to or greater than 2, and controls the recording/reproducing section to start from the first section. The data corresponding to each section of the N-th section is recorded sequentially, but at the end of each section, information on the start position of the data recorded in the section, information on the amount of data recorded in the section, and defects generated while recording the section A bookmark including updated disc management information including related information may be recorded, and the updated disc management information may be recorded in the lead-in area when recording of the Nth section is finished.

In one embodiment, the bookmark may further include information about the last address where the data of the corresponding section is recorded and information about the start address where the data of the next section is to be recorded.

In one embodiment, the control unit, prior to recording data corresponding to each section in the corresponding section of the data area, sets start position information of data to be recorded in the corresponding section and information on the amount of data to be recorded in the corresponding section in the lead-in area. It can record the startup disk management information including.

In one embodiment, the control unit may re-record the updated disc management information recorded in the lead-in area to the lead-out area.

In one embodiment, when the optical disc is closed, the controller may generate disc management information based on updated disc management information recorded in the lead-in area and record the disc management information in the lead-in area.

The present invention is not limited to the described embodiments, and it is obvious to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Accordingly, it should be said that such modifications or variations fall within the scope of the claims of the present invention.

10: optical disk 11: spindle motor
12: sled motor 20: optical pickup
30: light driver 40: digital signal processing unit
50: RF unit 60: servo/drive unit
70: control unit 80: interface unit
100: optical disk device

Claims (10)

Dividing the data area of the optical disc on which the requested data is to be recorded into N sections, which are natural numbers equal to or greater than 2;
The data corresponding to each section of the first section to the Nth section is recorded sequentially, but at the end of each section, information on the starting position of the data recorded in the section, information on the amount of data recorded in the section, and the corresponding section are recorded. recording a bookmark including updated disk management information including information related to the generated defect; and
and recording the updated disc management information in a lead-in area when the recording of the N-th section is finished. According to claim 1,
The method of claim 1 , wherein the bookmark further includes last address information at which data of a corresponding section is recorded and start address information at which data of a next section is to be recorded. According to claim 1,
In the step of sequentially recording, prior to recording data corresponding to each section in the corresponding section of the data area, start position information of the data to be recorded in the corresponding section and the amount of data to be written in the corresponding section in the lead-in area. An optical disc recording method, further comprising the step of recording start disc management information including information. According to claim 1,
and re-recording the updated disc management information recorded in the lead-in area into a lead-out area. According to claim 1,
and generating disc management information based on the updated disc management information recorded in the lead-in area when closing the optical disc, and recording the disc management information in the lead-in area. A spindle motor for rotating the optical disk, an optical pickup for focusing light on the optical disk, a sled motor for moving the optical pickup in the inner and outer circumferential direction of the optical disk, and the optical pickup, the sled motor and the rotation a recording/reproducing unit for driving a motor and processing servo signals and recording/reproducing data; and
It is configured to include a control unit for controlling the recording / playback unit,
The control unit divides the data area of the optical disc on which the requested data is to be recorded into N sections, which are natural numbers equal to or greater than 2, and controls the recording/reproducing unit to sequentially record data corresponding to each section from the first section to the N th section. Recording, but at the end of each section, a bookmark containing updated disk management information including information on the start position of data recorded in the section, information on the amount of data recorded in the section, and information related to defects that occurred while recording the section. and the updated disc management information is recorded in a lead-in area when the recording of the N-th section ends. According to claim 6,
The bookmark may further include information on a last address where data of a corresponding section is recorded and information on a start address where data of a next section is to be recorded. According to claim 6,
The control unit includes start position information of data to be recorded in the corresponding section and information on the amount of data to be recorded in the corresponding section in the lead-in area before recording data corresponding to each section in the corresponding section of the data area. An optical disk device characterized by recording startup disk management information. According to claim 6,
wherein the control unit re-records the updated disc management information recorded in the lead-in area into a lead-out area. According to claim 6,
wherein the control unit generates disc management information based on updated disc management information recorded in the lead-in area when closing the optical disc, and records the disc management information in the lead-in area.

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