KR20070058285A - Recording medium, method and apparatus of recording data to recording medium - Google Patents

Abstract

A recording medium, and an apparatus and a method for recording data in the recording medium are provided to improve a recording speed of a disc by processing management information, generated during a recording process, at one time and updating the management information, thereby improving performance of the recording medium. Data is recorded and the recorded data is verified(S10). An area where the data is recorded is verified, and defect state information is recorded in the first management information. Recording state information for the area where the data is recorded is recorded in the second management information. The defect state information is information related to whether the verified area is a defect area or a normal area. The recording state information is information indicating whether the verified area is an area where data is recorded or an area where data is not recorded.

Description

Recording medium, method and apparatus of recording data to recording medium

1 shows a structure of a single-layer in connection with the present invention

2 illustrates a random recording mode and a final recording address in accordance with the present invention.

3 illustrates an example of a structure for recording / verifying in connection with the present invention.

4A to 4D are diagrams for explaining the data recording method according to the present invention.

5 is a block diagram of a recording medium for a recording apparatus according to the present invention;

6 is a flowchart showing a data recording method according to the present invention.

* Explanation of symbols for the main parts of the drawings

10: recording / playback section 11: pickup

12: control unit 13: signal processing unit

14: Servo 15: Memory

16: micom 17: decoder

18: Encoder

The present invention relates to a recording medium, a method and apparatus for recording data on a recording medium.

A recording medium capable of recording a large amount of data is not only an increase in recording capacity, but also a compact disc (CD) and a DVD (Digital Versatile Disc). Recently, high quality video data and high quality audio data are recorded. The new high-density recording medium that can record and store for a long time, that is, the next generation recording medium is making continuous technological progress.

In addition, the next generation recording medium has been developed into a storage medium which can be used more conveniently by not only increasing the recording capacity but also improving the recording / reproducing speed.

Blu-ray Disc (BD), one of the next generation recording media technologies, is a next-generation optical recording solution capable of recording a significantly larger amount of data than the DVD. Along with other digital devices, technical specifications of the world standard are being discussed.

Therefore, there is a problem in implementing a method and apparatus for recording / reproducing a recording medium using the next-generation recording medium technology as described above.

Accordingly, the present invention has been made in view of the above circumstances, and an object thereof is to provide a recording medium and a method and apparatus for recording data on the recording medium.

In order to achieve the above object, an example of a data recording method according to the present invention comprises a method of recording data on a recording medium, comprising: recording data and verifying recorded data; Verifying an area in which data is recorded and recording defect state information in the first management information; And recording the recording state information in the second management information for the area where data is recorded.

At this time, the defect state information is information on whether the area in which data is recorded is a defect area or a normal area, and the recording state information is information on whether data is recorded in the area or an area in which data is not recorded. It is preferable.

Preferably, the area in which the data is recorded is verified to record an area in which the data is not normally detected as the defective area in the first management information.

Also, it is preferable to record in the second management information that the area in which the data is recorded is an area in which data is recorded.

In addition, the information recorded in the area where the data is not normally detected may include a step of alternately recording in the area in which no other data is recorded.

In the case of the alternative recording, if there is no area for replacement recording, it is preferable to record the area in the first management information as a defective area or a non-replaced area.

Preferably, the normal area is recorded in the second management information as an area in which data is recorded, and in the defective area or in an area in which no replacement is recorded, the second management information is recorded in an area in which no data is recorded.

Another example of the data recording method according to the present invention is, in recording data on a recording medium, recording / verifying the data in units of recording and verifying, and verifying the verification result management information. Detecting a block requiring an update and recording defect state information in the first management information; If a write command for the detected block is received, recording the write state information of the block in the second management information and performing the write command according to whether a spare area remains.

At this time, in the process of recording in the first management information, it is preferable that the defect state information of the detected block is recorded in the first management information as a defective area or a region which is not replaced.

Then, it is preferable to record the recording state information of the block recorded in the first management information in the defective area or the area which is not recorded in the second management information in the unrecorded area.

In the process of performing the write command, the drive may report to the host that a block requiring the update has occurred.

Preferably, the drive transmits first management information to the host.

In addition, the host preferably transmits a write command to the data of the corresponding block again using the received first management information.

In the process of performing the write command, the replacement area is preferably a spare area in the corresponding layer.

In addition, if the replacement area of the corresponding layer remains in the process of performing the write command, it is preferable to record the defect state information of the block as the area to be recorded in the first management information.

The recording state information of the block recorded in the first management information is preferably recorded in the second management information in the recording area.

In addition, if the replacement area of the corresponding layer does not remain in the process of performing the write command, it is preferable that the defect state information of the block is recorded in the first management information as a defective area or a non-replaced area.

The recording state information of the block recorded in the first management information is preferably recorded in the second management information as an unrecorded area.

An apparatus according to the present invention comprises: a pickup section for recording data in recording data on a recording medium; Record / verify data in units of recording and verifying, and detects and displays a block requiring updating of the verification result management information, and replaces when a write command is received for the displayed block. And a micom that controls the pickup unit to perform the write command depending on whether or not an area remains.

The recording medium according to the present invention includes a data area including a recording area, a replacement area, and at least one management area so that all data requested to be recorded in the recording area are recorded / verified in units of recording / verification. When the defect area is detected in the data area in the recording medium as a result of the verification, and the defect area is detected, data to be recorded in the defect area is recorded according to whether or not a replacement area remains, and management information associated with the defect area. Is recorded in the at least one management area.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings. With reference to the accompanying drawings, a recording medium, a data recording method and a device according to the present invention configured as described above will be described in detail.

In addition, the terminology used in the present invention was selected as a general term widely used as possible now. However, in certain cases, the applicant arbitrarily selected a term, and in this case, the meaning is described in detail in the corresponding part. Therefore, the terminology used in the present invention should be understood as not merely the name of the term but the meaning of the term.

As used herein, the term " recording medium " is a general term for all media on which data is stored, and includes, for example, an optical disk, a magnetic disk, and a magnetic tape system. Hereinafter, the recording medium of the present invention will be described using BD-R (recordable) as an example for convenience of description.

1 is a view showing the structure of a single-layer (single-layer) in the context of the present invention. The layer is divided into a lead-in zone, a data zone and a lead-out zone at the outermost periphery from the disc inner circumference. The data zone includes a user data area and a spare area. At this time, the spare area includes an inner spare area (ISA), which is a spare area close to the inner circumference of the disc, and an outer spare area (OSA), which is a spare area close to the outer circumference of the disc.

In addition, there is a temporary disc management area (TDMA) for disc management while the disc is in use. In FIG. 1, TDMA 0 has a fixed size and is present in the lead-in zone. . TDMA 1 and TDMA 2 have variable sizes and exist in the spare area. In this case, the TDMA 1 is in the inner spare area, and the TDMA 2 is in the outer spare area.

The present invention relates to a method for recording data on a recording medium. At this time, the recording of the data also includes updating of the disc management information. Therefore, in order to accurately reflect the state of the disk, it is necessary to continuously update the disk management information generated during the use of the disk.

In the context of the present invention, the disc management (Disc Management) is a process of performing defect management (Defect Management) to deal with the defects (logic) and logical overwrite (LOW) that may occur while using the disc; It includes two processes of recording management to define and control a method of recording on the disc.

The drive / system redirects the user data associated with the defect or logical LOW to be recorded in another location, called a spare area, for the defect management, and the information regarding the reassignment is returned to the defect list ( DFL: DeFect List). The spare area is for reallocating a defective cluster and an additional temporary disk management area (TDMA), and the spare area is located in the data zone.

In addition, the drive / system may include a sequential recording mode (SRM) including a logical overlapping (LOW), a continuous recording mode (SRM) and a random recording mode (Random) including a logical overlapping (LOW). There are three recording modes: Recording Mode (RRM). At this time, there is no logical overlapping LOW in the random recording mode RRM.

In this case, the continuous recording mode (SRM) is handled by a sequential recording range information (SRRI) structure, and the random recording mode (RRM) is a space bit map (SBM). It is handled by the structure. In addition, the three recording modes defined above are selected during the disk initialization process, and do not change after the selection. In the present invention, for convenience of description, a data recording method will be described using a random recording mode (RRM) as an example.

2 is a diagram illustrating a random recording mode (RRM) and a last recording address (LRA) according to the present invention.

In the random recording mode (RRM), data may be recorded randomly in all unrecorded recording units, for example clusters. The recording status information of all recording units in the user data area of the disc is reflected by the space bitmap SBM.

Each space bitmap SBM is included in one recording unit, for example, in a cluster. And while the disk is in use, an update to the space bitmap SBM will be recorded in the temporary disk management area TDMA. In addition, in the case of a dual layer disk, two space bitmaps (SBMs) included in two clusters may be divided into two. However, during disc closing, the last space bitmap SBM will be recorded in the disc management area (DMA).

The random recording mode RRM provides information on a final recording address (LRA) to be stored in a temporary disc definition structure (TDDS). At this time, the last write address (LRA) will indicate the highest Physical Sector Number (Physical Sector Number) containing the data provided by the host.

The above defect management information and record management information need to be updated several times while using the disc. A special area called a temporary disk management area (TDMA) will be available for the recording medium for the update.

In addition, in relation to the present invention, the temporary disc management structure (TDMS) should accurately reflect the current state of the disc, and for this purpose, the temporary disc management structure (TDMS) may be a temporary disc definition structure (TDDS), It consists of Temporary DeFect List (TDFL) and Space Bitmap (SBM). That is, after the user data is recorded on the disk, an update for the space bit map (SBM) and / or the temporary defect list (TDFL) is required.

The disc management information is continuously updated while the disc is in use. At this time, in relation to the disc management, if the disc management information is updated every time the disc management information is generated on the recording medium, the recording / reproducing speed of the recording medium may be reduced, thereby reducing the performance of the BD-R system as a whole. have.

Therefore, in the present invention, in recording the data on the recording medium, the data is recorded, the recorded data is verified, the area where the data is recorded, and the defect status information is recorded in the first management information. Then, the recording state information is recorded in the second management information for the area where data is recorded. At this time, the defect state information is information on whether the area where data is recorded is a defect area or a normal area, and the recording state information is information on whether data is recorded in the area or an area in which data is not recorded. .

The area in which the data is recorded is verified to record an area in which the data is not normally detected as the defective area in the first management information. Also, the area in which the data is recorded is recorded in the second management information that the area in which the data is recorded. The information recorded in the area where the data is not normally detected is alternatively recorded in the area in which no other data is recorded. At this time, if there is no area to be recorded in the replacement recording process, the area is recorded as the first management information as a defective area or an area in which the replacement is not recorded. The normal area is recorded in the second management information as an area in which data is recorded, and in the defective area or in an area in which no replacement is recorded, the second management information is recorded as an area in which no data is recorded.

3 is a view showing an example of a structure for recording / verifying in connection with the present invention. Referring to FIG. 3, the present invention sets a unit for pre-recording and verifying the data required for recording from the host in order to improve the recording speed of the recording medium. When data is received by the recording / validating unit, data recording is started. When the recording of the data is completed, the area in which the data is recorded is verified. Then, the above process is repeated for the next recording / verification unit. This will be repeated until all the data required for writing is received from the host.

In this case, the present invention does not replace data of an area requiring updating of the disc management information every time the disc management information occurs during recording / verification by the recording / verification unit. Check the block by checking whether there is a block that needs to be updated. When all of the data requested for recording from the host is recorded, the checked blocks are processed at once. That is, since the checked block is a region where management information has occurred, the management information for the block is updated at once. By the above, the recording speed of the recording medium can be improved. In this case, the recording / verifying unit may be regarded as one recording / verifying unit, for example, as much as the capacity of the drive buffer.

In order to manage the disc as described above, it is necessary to set that the disc is to be recorded in the above-described manner in advance. For this purpose, the host and the drive use the size of the owned buffer. At this point, the host buffer size will be much larger than the drive buffer size.

That is, the drive receives data from the host and starts recording in the recording / verification unit. When the recording is completed by one recording / verifying unit in the drive buffer, the drive verifies whether a defect occurs by verifying an area in which the data is recorded.

As a result of the determination, if the block requiring the update or the defect state information occurs, the block is checked, and data is received again from the host for the next recording / verification unit and the above-described process is repeated. The repetition is continued until the check after writing / verification of all data requested by the host is completed. When the process is completed, the drive updates the defect state information generated in the recording process, and reports to the host that a block requiring updating of the disc management information such as the defect has occurred. In the present invention, the above-described process is defined as page 1 (phase 1).

Through the page 1 process, the host recognizes that an error has occurred in the writing process, and requests the drive for detailed information regarding the error. The drive then sends the details to the host. In this case, the detailed information may be the disk management information most recently updated in the page 1 process. Therefore, the host retransmits the data of the corresponding block using the disk management information and transmits a write command.

Upon receiving the write command, the drive should determine whether a spare area in the recording medium remains. This is because, in order to perform the write command, the data to be written in the corresponding block must be replaced, but the write command of the host cannot be performed unless a replacement area for this is left. In this case, the replacement area may be a spare area of the corresponding layer. Therefore, the process of updating the disk management information is performed again according to whether the replacement area remains. In the present invention, the process after the page 1 process is defined as page 2 (phase 2).

4A to 4D are diagrams for explaining the data recording method according to the present invention. 4A to 4B show spare areas remaining, and 4C to 4D show spare areas not remaining. Hereinafter, the data recording method according to the present invention will be described in detail. In addition, since disc management is not performed when recording on the recording medium in real-time, the present invention excludes the above-mentioned real-time.

First, referring to the page 1 process with reference to FIG. 4A, the drive receives data requested for recording from the host by recording / verification unit and records it. When the recording is completed, the presence or absence of defect state information is verified during the recording process. As a result of the verification, if a region in which data due to a defect or the like is not normally detected in a specific recording unit, for example, a block, is regarded as a defective region, the corresponding recording unit is checked. The check means updating the disc management information by recording a corresponding block in a disc management information, that is, an entry in the defect list, as a defective area or a non-replaced area, that is, a non-reallocated defect (NRD). Then, the recording state information of the block registered with the NRD, that is, whether the data is a recorded area or an unrecorded area, that is, the space bitmap SBM is treated as unrecorded, that is, '0'. In the above-described process, the drive manages disks for one recording / verification unit.

The drive repeats the above-described process in the recording / verification unit with respect to the data requested for recording from the host, and terminates the process when all the data is recorded. That is, the disk management information is updated once in the above-described page 1 process.

When the page 1 process is finished, the process of page 2 is performed next. The page 2 process will be described with reference to FIG. 4B. The drive notifies the host that there has been an update of the disc management information after the update of the disc management information through the page 1 process. That is, the drive reports to the host that a block requiring updating of the disk management information due to a defect or the like has occurred during data writing.

Therefore, the host requests the drive for detailed information about the defective area, and the drive transmits the detailed information when the request is received from the host. In this case, the detailed information may be, for example, a disk management information, which is updated last by the drive in the page 1 process, that is, an entry of a defect list (DFL Entry).

Accordingly, the host receives the disk management information from the drive, retransmits data for the block to the drive, and sends a write command to the drive. When the drive receives the write command, the drive should perform a write command on the retransmitted data.

In this case, the drive must first determine whether the replacement area remains in the layer to which the block belongs. This is because the write process of the host in the drive does not rewrite the recording medium once, unlike the rewritable recording medium, instead of physically rewriting the same in the same block. . Therefore, the disc management information must be updated in the process of page 2.

As a result of the determination, if the spare area remains, as shown in FIG. 4C, the drive converts and records the block registered as NRD in the above-described page 1 process into a defective area and a replaceable recordable area, that is, RAD (Re-Allocated Defect). The recording state information for the block, that is, the space bitmap SBM, is recorded as '1'. As a result, the drive replaces the data resent from the host with the spare area and writes it.

However, if the spare area remains and is full, as shown in FIG. 4D, the drive maintains the NRD as a block that is registered as NRD on the defect list entry in the above-described page 1 process without changing to RAD. The recording state information, that is, the space bitmap SBM, will also be unrecorded. In such a case, the drive will not be able to perform the write command of the host since there is no spare area to replace the data retransmitted from the host. That is, in the process of page 2 according to the present invention, the disc management information is updated depending on whether or not a spare area to be replaced remains.

According to the present invention described above, in the page 1 process, NRD is always recorded on the defect list entry in relation to the disc management information, and unrecorded in the space bitmap SBM. In this case, even in the case of the BD-R, logical superimposition (LOW) is possible. This is because the space bitmap SBM is defined as unrecorded at the same time as registering with the NRD. As a result, a mapping is performed in which recording is performed while replacing the spare area with the user data area because of logical overlapping.

In order to carry out the present invention in the random recording mode (RRM) of the BD-R, the drive registers with the NRD for a block requiring updating of the disc management information as a result of recording / verification, and a space bitmap of the area registered with the NRD. (SBM) is defined as unrecorded. At this time, if the space bitmap SBM is written, the result is that the logically superimposed write LOW is not supported, resulting in an error and thus cannot be processed. Therefore, in the present invention, the space bitmap (SBM) for the block is defined as unwritten, and when the drive receives a write command for the area from the host, the area is registered as RAD, and the space bitmap (SBM) is defined. Is to turn to record.

The above-described recording medium according to the present invention operates by dividing data into two stages, i.e., pages 1 and 2, when recording data. Therefore, according to the present invention, recording and disc management are performed in units of recording and verifying, and thus the speed of recording data and disc management information on the recording medium is improved, thereby improving the performance of the disc. At this time, if the capacity of the recording and verification unit, that is, the drive buffer, is increased, the performance of the disk as a whole, that is, the recording speed of the disk, will increase.

Hereinafter, as another embodiment according to the present invention, the above-described recording method and apparatus for a recording medium will be described. FIG. 5 is a block diagram illustrating a recording medium of a recording apparatus according to the present invention.

First, the pickup unit 11 for recording / reproducing data recorded on the disc and management information including the data, the servo 14 controlling the operation of the pickup unit 11, and the pickup unit 11 received from the pickup unit 11; A signal processor 13 for restoring a reproduced signal to a desired signal value or modulating and transmitting the signal to be recorded into an optical disk in a form necessary for recording, and a memory 15 for storing various kinds of information necessary for reproducing the disc; Basically, the microcomputer 16 controls the operation of the component. In connection with the above components, it is also referred to as a "recording / reproducing unit 10", and the recording and reproducing unit 10 can be provided as a single product.

At this time, the microcomputer 16 records / verifies data in recording / verification units, detects a block requiring updating of the verification result management information, and records the defect state information and the recording state information. Updating management information for the block, and if a write command is received for the block, updating or maintaining the defect state information and the recording state information according to whether a replacement area remains, and controlling a pickup unit to perform the write command. It is characterized by.

The control unit 12 is responsible for the control of the entire component.

The decoder 17 finally decodes the output data under the control of the controller 12 and provides it to the user.

The encoder 18 transmits an input signal in a specific format, for example, an MPEG2 transport stream, under the control of the controller 12, in order to record data desired by a user on a recording medium. ) Is provided to the signal processor 13.

As described above, FIG. 5 includes both components of a recording medium recording and reproducing apparatus. First, a recording medium, a recording and reproducing unit 10, and a decoder 17 are used in connection with reproduction. The recording medium, the recording / reproducing unit 10, and the encoder 18 will be used under the control of the control unit 12.

Referring to the method of recording / reproducing the recording medium using the apparatus for recording / reproducing the above-described recording medium, FIG. 6 is a flowchart illustrating a disc management method according to the present invention. In this case, the recording mode of the recording medium is described as an example of random recording mode (RRM).

The drive receives data from the host in units of recording / verification and starts recording the received data. After recording of the data received in the recording / verification unit is completed, the recording of the completed recording units is verified (S10). The verification result checks whether a block requiring updating of the disc management information has occurred in the recording process (S20).

If a block in which the disk management information needs to be updated is found as a result of the inspection, the drive records the defect status information of the block as an NRD in the entry of the defect list DFL, and writes the recording status information for the block to the space bit. Unrecorded, i.e., recorded as '0' in the map SBM (S30). The process up to S30 is the page 1 process in the present invention.

The drive transmits to the host that the defect status information and the recording status information have been updated, that is, a defect has occurred in the recording process. The host requests and receives detailed information about a block requiring updating of the disk management information from the drive. The host retransmits the data of the block to the drive using the detailed information, and sends a write command to the drive.

In page 1, defect state information for a block requiring updating of the disc management information is recorded in NRD, and recording state information SBM is recorded unrecorded. Therefore, in the block, data was actually written, but defects occurred and no replacement was made. Thus, the drive does not read the block again and treats it as if there were no writes to that block. Thus, a write command can be sent from the host to the block.

In operation S40, the drive determines whether a write command is received from the host. If the write command is received as a result of the determination, the write command is treated as if a defect is generated and replaced. Therefore, it is determined whether a spare area, i.e. a spare area, necessary for the replacement is left (S50).

If the spare area remains as a result of the determination, the drive may be replaced, and thus the write command may be performed. Therefore, the drive converts the defect status information for the block from NRD to RAD in the entry of the defect list and records it. The recording state information for the block is treated as unrecorded, that is, recorded as '1'. That is, in this case, the update of the disk management information is made again (S60).

However, if the spare area does not remain as a result of the determination, the drive may not perform a write command of the host because there is no space for replacement. Therefore, the drive keeps the defect state information for the block as NRD, and also keeps the recorded state information as unrecorded.

As described above, according to the method and apparatus for recording data on a recording medium and a recording medium according to the present invention, data is recorded on a recording medium in recording / verification units and the management information generated in the recording process is processed all at once. By updating, the recording speed of the disc can be increased and the performance of the recording medium as a whole can be improved.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (21)

In the method of recording data on a recording medium, Recording the data and verifying the recorded data; Verifying an area in which data is recorded and recording defect state information in the first management information; And recording the recording state information in the second management information for the area in which the data is recorded. The method of claim 1, The defect state information is information on whether the area in which data is recorded is a defect area or a normal area, and the recording state information is information on whether the data is recorded in the area or whether the data is unrecorded area. The data recording method. The method of claim 2, And verifying the area in which the data is recorded so that the area in which data is not normally detected is recorded as the defective area in the first management information. The method of claim 2, And recording in the second management information that the area in which the data is recorded is an area in which data is recorded. The method of claim 3, wherein Information recorded in an area in which the data is not normally detected includes a step of alternately recording in an area in which no other data is recorded. The method of claim 5, And when there is no area to be recorded in the replacement recording process, the area is recorded in the first management information as a defective area or a non-replaced area. The method of claim 6, Data is recorded in the second management information as the area where data is recorded in the normal area, and in the second management information as the area where no data is recorded in the defective area or the area not recorded therein. Way. In recording data on a recording medium, Recording / verifying data in units of recording and verifying, detecting a block requiring updating of the verification result management information, and recording defect state information in the first management information; And when the write command for the detected block is received, recording the write state information of the block in the second management information and performing the write command according to whether a replacement area remains. Recording method. The method of claim 8, And in the process of recording in the first management information, the defect state information of the detected block is recorded in the first management information as a defective area or a region which is not alternately recorded. The method of claim 9, And recording state information of a block recorded in the first management information as a defective area or a region which is not alternately recorded in the second management information as an unrecorded area. The method of claim 8, In the process of performing the write command, the drive reports to the host that the block requiring the update has occurred. The method of claim 11, And the drive transmits first management information to a host. The method of claim 12, And the host retransmits a write command to the data of the corresponding block by using the received first management information. The method of claim 8, And a substitute area in the process of performing the write command is a spare area in a corresponding layer. The method of claim 8, And if the replacement area of the corresponding layer remains in the process of performing the write command, the defect state information of the block is recorded in the first management information as an area to be recorded. The method of claim 15, And recording state information of a block recorded in the first management information is recorded in the second management information as a recording area. The method of claim 8, And if the replacement area of the corresponding layer does not remain in the process of performing the write command, the defect state information of the block is recorded in the first management information as a defective area or a non-replaced area. The method of claim 17, And recording state information of a block recorded in the first management information is recorded in the second management information as an unrecorded area. In recording data on a recording medium, A pickup unit for recording data; Record / verify data in units of recording and verifying, and detects and displays a block requiring updating of the verification result management information, and replaces when a write command is received for the displayed block. And a micom for controlling a pickup unit to perform the write command depending on whether or not an area remains. A data area including a recording area, a replacement area, and at least one management area, After all data requested for recording in the recording area is recorded / verified in units of recording / verification, a defect area is detected in the data area in the verification result recording medium, When the defective area is detected, data to be recorded in the defective area is recorded depending on whether or not a spare area remains. And management information related to the defective area is recorded in the at least one management area. The method of claim 20, And the recording medium is a recordable BD-R (ecordable).

Images