JPH10289528A - Optical disk recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record information again on a rewritable optical disk with a fixed length packet writing system to be prerecorded which changing packet lengths of them by storing user data block information of respective packets being in tracks in a buffer while reading them. SOLUTION: The recording processing of information by the fixed length packet writing system with respect to respective tracks being on an optical disk 1, a rewriting processing changing packet lengths of information being on the disk 1 and an error processing at the time of the rewriting processing or the like are performed with the control of a controller 9. Moreover, the controller 9 reproduces the user data block information of packets of respective tracks being on the disk 1 with information reproducing part 13 and stores them in a buffer 11. The contents of them are not changed in the buffer 11 and after only packet lengths are changed, the information are overwritingly recorded on concerned tracks. In short, at the time of rerecording of the information, the information are recorded by changing positions of blocks for link.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording apparatus for writing information on a rewritable optical disk such as a CD-RW.

[0002]

2. Description of the Related Art Minimum reproduction of information recorded in a recording area of an optical disk such as a compact disk (CD) which is a read-only optical disk, a writable optical disk such as a CD-R, and a rewritable optical disk such as a CD-RW. The unit is called a block, and one block is 2048
It contains information of up to 2352 bytes (Byte).

The minimum recording unit of data on an optical disk such as the CD-R or CD-RW is called a packet.
At least one reproducible user data block and five link blocks (one link block and four run-in blocks) provided before the user data block
And two link blocks (two run-out blocks) provided after the user data block.

[0004] As described in the Orange Book, the link block is a block necessary for connecting packets when recording information on an optical disc, and does not include user data. The data recording rule for the optical disc as described above is referred to as a “linking rule”.

[0005] As a method of recording data on a CD-R (also referred to as a "recordable compact disc") or a CD-RW (also referred to as a "rewritable compact disc"), a "track-at-once method" and a "track-at-once method" are used. Packet write method ".

[0006] The track-at-once method is a method of recording a track in one packet at a time. The user data blocks in the track are continuous, and no link block exists between the user data blocks. The track is a recording unit capable of recording up to 99 tracks on the optical disc, and its start address, end address, and the like are stored in another area on the optical disc in table of contents information (TOC: Tabl).
e Of Content).

On the other hand, the packet write method is a method in which a track is divided into a plurality of packets and recording is performed for each packet. Since recording is performed in packet units, user data blocks in one track exist discretely, and a link block exists between the user data blocks.

The packet write system is further classified into two types, a "fixed length packet write system" and a "variable length packet write system". The fixed-length packet write method is a recording method for fixing the number of user data blocks in a packet called a packet length (packet size) in a track. On the other hand, the variable length packet write method
This is a recording method in which packets of various packet lengths are mixed in a track.

Further, each block in the optical disk includes:
Physical addresses in ascending order from "0"("Physicaladdress"
) Is assigned, and when accessing the physical address, the physical address is accessed using an address obtained by logically converting the physical address (referred to as “logical address”).

In the variable length packet write method, the physical address and the logical address are linear, and the logical address is also assigned to the link block.
There is a logical address that cannot be accessed.

On the other hand, in the fixed-length packet write method, since a logical address is assigned only to a user data block, the physical address and the logical address of the first user data block of the track match, and the user data blocks are in ascending order from the beginning. Is assigned a logical address and the link block is skipped. Therefore, there is no break in the logical address space, and the information recorded on the optical disc can be reproduced without being conscious of being a packet.

[0012]

However, in the above-described fixed-length packet write system, the packet length becomes a problem. The minimum recording unit of information on the optical disk is a packet. In the case of the fixed-length packet write system, it is necessary to fix the packet length of each packet to the same size and always record user data for the packet length during recording. .

Therefore, if the packet length is too large,
Even when recording only a small amount of information, it is necessary to record an entire packet, and the recording time of information becomes longer,
There is a problem that the recording capacity of the optical disk is wasted.

On the other hand, if the packet length is too small, there is a problem that the capacity of the link block is reduced.
That is, seven link blocks are required per packet, and if the packet length is too small and the number of user data blocks is too small, the proportion of the link blocks in the packet increases, and the area for recording user data becomes large. It will be less. For example, if the packet length is "2",
The track capacity becomes 2 / (2 + 7), and the recording area of the user data becomes 30% or less.

For example, when information is recorded in a fixed-length packet, the information is divided into a plurality of packets. In the fixed-length packet writing method for an optical disk, the packet length is set to a multiple of 1 to 2 blocks. , 64, 128, etc. Since the amount of information per block of the optical disk is 2 Kbytes, the amount of information per packet is 2K, 4K, 8K,.
, 128K, 256K, etc.
No. 31104).

If the information amount differs depending on the packet length, the difference in efficiency depending on the application becomes large, and the recording capacity of the optical disk is wasted.

Therefore, when the amount of information to be recorded at one time is large, the packet length is increased, and when a small amount of information is recorded many times, the packet length is reduced, so that the recording area of the optical disk is wasted less. be able to. But,
Since the amount of information and the recording frequency may change in the middle of the recording area, it is difficult to determine the optimal packet length first.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is a first object of the present invention to change the packet length of information recorded on a rewritable optical disk by a fixed-length packet write method so that the information can be re-recorded. The purpose of.

As described above, since a total of seven link blocks must be present at the beginning and end of a packet, reducing the packet length reduces the number of user data blocks in one packet, In order to keep the same number of data blocks, the number of packets increases. Therefore, the total number of link blocks also increases, and consequently the number of blocks used increases.

For example, information composed of two packets having a packet length of "10" uses (10 + 7) × 2 = 34 blocks. If this information is composed of four packets having a packet length of "5", 5 + 7) × 4 = 48 blocks, and the number of used blocks also increases for 14 blocks.

The fixed-length packet write method is a method in which a track is divided into a plurality of packets and information is recorded for each packet. That is, since the packet must be present in the track, it cannot exceed the capacity of the track.

However, although the number of blocks is increased by reducing the packet length, if the amount exceeds the track block amount (referred to as "track length"), it is impossible to re-record all user data blocks. Problems arise.

Further, when information is recorded in one packet, it is necessary to continuously record the blocks constituting the packet at once. That is, it is necessary to store all the information of the blocks constituting the packet in the buffer and record them all at once, and it is impossible to divide and record the packet.

As described above, when the new packet length at the time of re-recording exceeds the buffer capacity, a sufficient amount of information for recording one packet cannot be stored in the buffer, and the packet is recorded in the packet. Information that should be missing.

If the blocks in the packet can be individually recorded, the blocks constituting the packet are individually read into the buffer before recording, and are recorded in the buffer again. As described above, since the packets need to be recorded all at once, the restrictions imposed by the buffer capacity cannot be ignored. Therefore, there is a problem that information having a packet length exceeding the buffer capacity cannot be re-recorded.

Furthermore, a packet cannot be read unless it has been recorded in accordance with the linking rules.
For example, if a part of a certain packet is overwritten by another packet, the part that is not overwritten by the user data block is overwritten by the link block of the overwriting packet, or becomes an area that does not follow the linking rule even if it is not overwritten. Will not be able to read correctly.

That is, all the information of the packet to be re-recorded must be read into the buffer before being overwritten. If the blocks that make up the packet can be recorded individually, there is no restriction on the buffer capacity, but since the packet must be recorded at once, all the user data blocks of the overwritten packet are read into the buffer before overwriting. Need to be kept.

However, since the packet length of the packet recorded on the optical disk exceeds the buffer capacity,
If all the information in the packet cannot be stored in the buffer and the packet recorded on the optical disk is overwritten, the remaining part cannot be read correctly, and as a result, all the original information is re-recorded The problem arises that it becomes impossible to do so.

Therefore, it is a second object of the present invention to prevent a situation where re-recording cannot be performed when changing the packet length of information recorded on a rewritable optical disk by a fixed-length packet write method. Aim.

[0030]

In order to achieve the first object, the present invention forms a plurality of tracks in a recording area of a rewritable optical disk, divides each track into a plurality of packets, and In a fixed-length packet write type optical disc recording apparatus that fixes the number of user data blocks of each packet in a track to the same number and collectively records information for each packet, the information of the user data block of each packet in the track is May be read and stored in a buffer, and means for changing the packet length of each piece of information and re-recording the information in the track may be provided.

In order to achieve the second object,
It is preferable to provide means for calculating the total number of blocks due to the change in the packet length and, when the total number of blocks exceeds the capacity of the track, stopping the re-recording and reporting an error.

Further, when the capacity after the change of the packet length exceeds the capacity of the buffer, means for stopping the re-recording and reporting an error may be provided.

Further, when the capacity of the packet in the track exceeds the capacity of the buffer, means for stopping the re-recording and reporting an error may be provided.

An optical disk recording apparatus according to a first aspect of the present invention reads information of a user data block of each packet for each of a plurality of tracks formed in a recording area of a rewritable optical disk and stores the information in a buffer. The packet length of the information is changed and re-recorded in the track.

In this way, after recording information in the recording area of the rewritable optical disk by the fixed-length packet write method, re-recording is performed by changing only the packet length without changing the content, and the packet length is adjusted to an appropriate length. Can be changed to
Therefore, the physical address can be changed by re-recording the information recorded in the recording area of the rewritable optical disk by the fixed-length packet write method as the same block while keeping the logical address continuous.

In the optical disk recording apparatus according to the second aspect of the present invention, when the capacity of the total number of blocks exceeds the track capacity due to the change of the packet length, the re-recording of the information on the optical disk is automatically stopped and an error report is made. I do.

Therefore, by reducing the packet length when changing the packet length, the total number of blocks increases, and the capacity of the total number of blocks exceeds the capacity of the track length to prevent information from being recorded in the track beforehand. Thus, it is possible to prevent the information recorded on the rewritable optical disk from being destroyed and becoming unreproducible.

Further, the optical disc recording apparatus according to the third aspect of the present invention automatically stops re-recording of information on the optical disc and reports an error when the capacity after the change of the packet length exceeds the capacity of the buffer.

Therefore, when the packet length is changed, the packet length is too long, so that all the information of the changed packet length cannot be stored in the buffer. Thus, it is possible to prevent the information recorded on the rewritable optical disk from being destroyed and becoming unreproducible.

Further, the optical disc recording apparatus according to the fourth aspect of the present invention automatically stops re-recording of information on the optical disc and reports an error when the capacity of a packet in a track exceeds the capacity of a buffer.

Therefore, the capacity of the packet length of the packet recorded in the recording area of the rewritable optical disk is larger than the capacity of the buffer, so that all information of the packet cannot be stored in the buffer. It is possible to prevent the remaining information from being incorrectly read from the recording area before recording, and prevent the information recorded on the rewritable optical disk from being destroyed and becoming unreproducible.

[0042]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 2 is a block diagram showing a configuration of an optical disk recording apparatus according to one embodiment of the present invention.

This optical disk recording device is a device for spirally recording an information signal called a pit array on a disk-shaped rewritable optical disk such as a CD-RW and reading an information unit called a block from the pit array. In the recording, the number of user data blocks in the packet, called a packet length, of a recording unit called a packet in which a block not containing user data called a link block is added before and after the user data block,
This is a device for recording by a fixed-length packet write method in which the data is fixed in a set of packets called a track.

As shown in FIG. 2, this optical disk recording apparatus has a spindle motor (hereinafter referred to as "motor") 2 for rotating an optical disk 1 such as a CD-RW, and a recording area of the optical disk 1 on which a semiconductor laser is mounted. And a coarse motor 4 for moving the optical pickup 3 in the radial direction of the optical disk 1 in cooperation with a seek motor provided therein.

A rotation control system 5 for controlling the rotation of the motor 2, a coarse motor control system 6 for controlling the drive of the coarse motor 4, an optical pickup control system 7 for controlling the optical pickup 3, A signal processing system 8 for transmitting and receiving a signal of information read by the pickup 3 and a signal of information to be written to a recording area of the optical disc 1;
And a controller 9 for controlling the processing system 8 and performing the processing according to the present invention.

Further, the controller 9 is connected to a host computer via an external interface 10 and performs processing for sending information read from the optical disk 1 to the host computer and receiving information to be written on the optical disk 1 from the host computer.

Then, the optical pickup 3 is moved in the radial direction of the optical disk 1 while rotating the optical disk 1 by the motor 2, and a laser beam L is irradiated from the semiconductor laser of the optical pickup 3 onto a recording area on the recording surface of the optical disk 1. Then, information is recorded or reproduced.

When recording information under the control of the controller 9, the optical disk recording apparatus uses the laser power L from the optical pickup 3 to the recording area of the optical disk 1 with the recording power.
And various information is recorded on the optical disc 1. When information is reproduced under the control of the controller 9,
The recording area of the optical disc 1 is irradiated with the laser beam L by the optical pickup 3 at the reproduction power, and the information recorded in the recording area is reproduced based on the reflected light.

In this optical disk recording apparatus, under the control of the controller 9, information recording processing for each track on the optical disk 1 according to the present invention by the fixed length packet write method and the packet length of the information on the optical disk 1 are changed. It performs rewriting processing and error processing during the rewriting processing.

FIG. 1 is a block diagram showing functions according to the present invention in the optical disk recording apparatus shown in FIG.
The signal processing system 8 shown in FIG. 2 includes the buffer 11, the information recording unit 12, and the information reproducing unit 13 according to the present invention.

The controller 9 controls the information reproducing unit 1
3 reproduces the information of the user data block of the packet of each track on the optical disk 1 and stores it in the buffer 11. After changing only the packet length without changing the data content of the user data block in the buffer 11 at all, the information recording unit 12 overwrites the track on the optical disc 1 by overwriting. That is, when information is re-recorded, the position of the link block is changed and recorded.

That is, the controller 9, buffer 11, information recording unit 12, and information reproducing unit 13 form a plurality of tracks in a recording area of a rewritable optical disk,
Each track is divided into a plurality of packets, the number of user data blocks in each packet in one track is fixed to the same number, and the function of the fixed length packet write method of recording information collectively for each packet is performed. It functions as a means for reading the information of the user data block of each packet in the track and storing it in a buffer, changing the packet length of each information and re-recording the information in the track.

The function of means for calculating the total number of blocks due to the change in the packet length and stopping the re-recording and reporting an error when the total number of blocks exceeds the capacity of the track. Further, when the capacity after the change of the packet length exceeds the capacity of the buffer, the re-recording is stopped and an error reporting function is performed. Furthermore, when the capacity of the packet in the track exceeds the capacity of the buffer, the function of the means for stopping the re-recording and reporting an error is also performed.

FIG. 3 is an explanatory diagram of a fixed-length packet write system in the optical disk recording apparatus shown in FIG. The fixed-length packet write method forms a plurality of tracks in a recording area of a rewritable optical disk, divides each track into a plurality of packets, and fixes the number of user data blocks of each packet in one track to the same number. In this method, information is collectively recorded for each packet.

Therefore, as shown in FIG. 3, in the fixed length packet write system, the recording area of the optical disc 1
In this format, each packet 21 in one track 20 has the same packet length, and the number of user data blocks in each packet 21 is the same.

FIG. 4 is an explanatory diagram showing a packet format in the fixed-length packet write system shown in FIG. About the packet, Orange Book Part 2 Version 2.0 (Orange Book Pa
rtII Version 2.0), and will be briefly described here.

The packet is composed of one or more reproducible user data blocks 24 and one link block (Link Block) 2 provided before the user data blocks.
Two and four run-in blocks
k) 23, and two link blocks including two run-out blocks (Run-Out Blocks) 25 provided after the user data block 24.

The link block is a block necessary for connecting the packets 21 when information is recorded in the user data block 24 of the packet 21 on the track of the optical disc 1.

FIG. 5 is a diagram showing the concept of the address space of the fixed-length packet write method and the variable-length packet write method. In the variable length packet write method, as indicated by the broken line in the figure, the logical address and the physical address become linear, and the logical address is assigned to the link block, so that the logical address of the user data block is skipped.

On the other hand, in the fixed-length packet write method, as shown by the solid line in the figure, the logical address is continuous with the user data block, and no logical address is assigned to the link block. Therefore, in the fixed-length packet write system, there is no break in the logical address space, and information recorded on the optical disk can be reproduced without being conscious of being a packet.

Next, a description will be given of a process of rewriting information on the optical disk of the optical disk device. In this process, the controller 9 reads the information of the user data block of each packet for each of a plurality of tracks formed in the recording area of the optical disc 1 by the information reproducing unit 13 and stores the information in the buffer 11. The length is changed, and the information is recorded by the information recording unit 12 in the track of the optical disc 1 again.

FIG. 6 is a flowchart showing a process of rewriting information on an optical disk by the optical disk recording apparatus shown in FIG. In this processing, it is determined in step (indicated by "S" in the figure) 1 whether or not unrewritten packets remain in the track, and if all the packets in the track have been rewritten, this processing is ended. .

If it is determined in step 1 that an unrewritten packet remains, the process proceeds to step 2 where the data of the user data block of the unrewritten packet is read into the buffer, and the process proceeds to step 3 where the packet size of the user data block in the buffer is read. Is changed, and the overwritten packet is rewritten after the already rewritten packet of the track.
This process is repeated until all the packets in the track are rewritten.

In this way, after information is recorded on each track of the optical disc 1 in a packet having a fixed packet length by the fixed length packet write method, the packet length is changed to an appropriate packet length for the information amount without changing the content of the information. Can be re-recorded. Therefore, the information recorded on the optical disk 1 by the fixed-length packet write method can be rewritten as the same block while the logical address is continued, and the physical address can be changed. The time can be reduced, and the recording capacity of the optical disc 1 can be saved.

Next, an explanation will be given of error processing at the time of rewriting information on the optical disk in the optical disk recording apparatus. In this processing, when the capacity of the total number of blocks due to the change in the packet length exceeds the capacity of the track, the controller 9 automatically stops the information recording unit 12 from re-recording the information on the optical disk 1 and transmits the information via the external interface 10. Error report to the host computer.

FIG. 7 is a flowchart showing another rewriting process of the information on the optical disk by the optical disk recording apparatus shown in FIG. This processing is performed in steps (“S” in the figure)
In step 11, the total number of blocks due to the change in the packet length at the time of information rewriting is calculated, and it is determined whether or not the capacity of the total number of blocks after rewriting exceeds the track length (track capacity). Proceeding to step 15, the re-recording of the information on the optical disc is automatically stopped, an error is reported to the host computer, and this process is terminated.

If it is determined in step 11 that the capacity of the total number of blocks after rewriting does not exceed the track length, step 1
It proceeds to step 2 to determine whether or not unrewritten packets remain in the track. If all the packets in the track have been rewritten, this process ends.

If it is determined in step 12 that an unrewritten packet remains, the flow advances to step 13 to read the data of the user data block of the unrewritten packet into the buffer, and the flow advances to step 14 to read the packet size of the user data block in the buffer. Is changed, and the overwritten packet is rewritten after the already rewritten packet of the track. This process is repeated until all the packets in the track are rewritten.

Therefore, if the total number of blocks is increased by reducing the packet length when the packet length is changed, and the capacity of the total number of blocks exceeds the capacity of the track length, the information cannot be recorded in the track automatically. Since the rewriting of information can be stopped in an
Can be prevented from being unreproducible due to destruction of the information recorded in the.

Next, another error processing at the time of rewriting information on the optical disk in the optical disk recording apparatus will be described. In this process, when the capacity after the change of the packet length exceeds the capacity of the buffer 11, the controller 9 automatically stops the information recording unit 12 from re-recording the information on the optical disc 1 and the host 9 via the external interface 10. Report an error to the computer.

FIG. 8 is a flowchart showing still another rewriting process of information on an optical disk by the optical disk recording apparatus shown in FIG. In this process, it is determined in step (indicated by "S" in the figure) 21 whether or not the new packet length (packet capacity) at the time of information rewriting is larger than the buffer size (buffer capacity). Then, the re-recording of information on the optical disk is automatically stopped, an error is reported to the host computer, and the process is terminated.

That is, when the capacity of the changed packet length exceeds the capacity of the buffer 11, re-recording of information on the optical disk 1 is stopped and an error report is sent to the host computer via the external interface 10.

If it is determined in step 21 that the new packet length is not larger than the buffer size, the flow advances to step 22 to calculate the total number of blocks due to the change in the packet length at the time of information rewriting. Length (track capacity) or not,
If it exceeds, the process proceeds to step 26, where the re-recording of the information on the optical disk is automatically stopped, an error is reported to the host computer, and this process ends.

If the capacity of the total number of blocks after rewriting does not exceed the track length in the judgment of step 22, step 2
The process proceeds to step 3 to determine whether or not unrewritten packets remain in the track. If all the packets in the track have been rewritten, the process is terminated.

If it is determined in step 23 that an unwritten packet remains, the flow advances to step 24 to read the data of the user data block of the unwritten packet into the buffer, and the flow advances to step 25 to set the packet size of the user data block in the buffer. Is changed, and the overwritten packet is rewritten after the already rewritten packet of the track. This process is repeated until all the packets in the track are rewritten.

The order of the judgments in steps 21 and 22 is not limited to the order described above, and either one may be performed first.

Therefore, when the packet length is changed and the packet length is too large to store all the information of the changed packet length in the buffer, re-recording is automatically stopped and information to be re-recorded is lost. It is possible to prevent the information recorded on the optical disk 1 from being destroyed and prevent the information recorded on the optical disk 1 from being destroyed and from being unreproducible.

Next, another error processing at the time of rewriting information on the optical disk in the optical disk recording apparatus will be described. In this processing, when the capacity of the packet in the track exceeds the capacity of the buffer 11, the controller 9 automatically stops the information recording unit 12 from re-recording the information on the optical disc 1 and the host computer via the external interface 10. Report an error to.

FIG. 9 is a flowchart showing still another rewriting process of the information on the optical disk by the optical disk recording apparatus shown in FIG. In this process, it is determined in step (indicated by "S" in the figure) 31 whether or not the packet length (packet capacity) of the already recorded packet on the optical disk is larger than the buffer size (buffer capacity). Proceeding to 37, the re-recording of the information on the optical disc is automatically stopped, an error report is sent to the host computer, and this process is terminated.

That is, when the packet length of a packet read out for rewriting from a track on the optical disk 1 exceeds the capacity of the buffer, re-recording of information on the optical disk 1 is stopped and an error is reported to the host computer via the external interface 10.

If it is determined in step 31 that the packet length of the already recorded packet is not larger than the buffer size, the flow advances to step 32 to determine whether or not the new packet length at the time of information rewriting is larger than the buffer size (buffer capacity). If it is larger, the process proceeds to step 37, where the re-recording of the information on the optical disk is automatically stopped, an error is reported to the host computer, and this process is terminated.

That is, when the capacity of the changed packet length exceeds the capacity of the buffer 11, re-recording of information on the optical disk 1 is stopped and an error report is sent to the host computer via the external interface 10.

If it is determined in step 32 that the new packet length is not larger than the buffer size, the flow advances to step 33 to calculate the total number of blocks due to the change in the packet length at the time of information rewriting. Length (track capacity) or not,
If it exceeds, the process proceeds to step 37, where the re-recording of the information on the optical disk is automatically stopped, an error is reported to the host computer, and this process is terminated.

If it is determined in step 33 that the capacity of the total number of blocks after rewriting does not exceed the track length, step 3
Proceeding to step 4, it is determined whether or not unrewritten packets remain in the track. If all the packets in the track have been rewritten, this process is terminated.

If it is determined in step 34 that an unrewritten packet remains, the flow advances to step 35 to read the data of the user data block of the unrewritten packet into the buffer, and the flow advances to step 36 to set the packet size of the user data block in the buffer. Is changed, and the overwritten packet is rewritten after the already rewritten packet of the track. This process is repeated until all the packets in the track are rewritten.

The order of the determinations in steps 31, 32, and 33 is not limited to the order described above, and any of the determinations may be made first.

Therefore, the capacity of the packet length of the packet recorded on each track of the optical disc 1 is
If the capacity of the packet is larger than the capacity of the packet and all the information of the packet cannot be stored in the buffer 11, the re-recording is automatically stopped and the information to be re-recorded is recorded without any information, and the remaining information can be correctly read from the track. It is possible to prevent the information from being lost and prevent the information recorded on the optical disk 1 from being destroyed and becoming unreproducible.

FIG. 10 is a diagram showing a format before and after rewriting of information on an optical disk by the optical disk recording apparatus shown in FIG. When the packet length of each packet of the track is reduced, information of a user data block (a block interposed between link blocks indicated by oblique lines in the figure) is read from each packet, and a new information including information corresponding to the reduced packet length is read. Packets (blocks interposed between link blocks indicated by oblique lines in the figure) are sequentially overwritten in the track.

Therefore, although the packet length of the packet before the re-recording has been changed after the re-recording, the existence of the user data block remains unchanged, and the physical location (physical address) has been changed. Moreover, since the logical address remains continuous for the user data block and the logical address is the same before and after re-recording, the user data block can be accessed after re-recording in the same manner as before re-recording. .

[0090]

As described above, according to the optical disk recording device of the first aspect of the present invention, the packet length of the information recorded on the rewritable optical disk by the fixed length packet write system is changed and re-recorded. can do. Further, according to the optical disk recording device according to the second to fourth aspects of the present invention, when the packet length of the information recorded on the rewritable optical disk by the fixed length packet write system is changed and re-recorded, the re-recording becomes impossible. Things can be avoided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing functions according to the present invention in the optical disk recording device shown in FIG.

FIG. 2 is a block diagram showing a configuration of an optical disk recording device according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a fixed-length packet write system in the optical disc recording device shown in FIG. 2;

FIG. 4 is an explanatory diagram showing a format of a packet in the fixed-length packet write system shown in FIG. 3;

FIG. 5 is a diagram showing the concept of an address space of a fixed-length packet write method and a variable-length packet write method.

FIG. 6 is a flowchart showing a process of rewriting information on an optical disk by the optical disk recording device shown in FIG. 2;

7 is a flowchart showing another rewriting process of information on the optical disc by the optical disc recording device shown in FIG. 2;

8 is a flowchart showing yet another rewriting process of information on an optical disk by the optical disk recording device shown in FIG. 2;

9 is a flowchart showing still another rewriting process of information on an optical disk by the optical disk recording device shown in FIG. 2;

10 is a diagram showing a format before and after rewriting of information on an optical disc by the optical disc recording apparatus shown in FIG. 2;

[Explanation of symbols]

 1: optical disc 2: motor 3: optical pickup 4: coarse motor 5: rotation control system 6: coarse motor control system 7: optical pickup control system 8: signal processing system 9: controller 10: external interface 11: buffer 12: Information recording unit 13: Information reproducing unit 21: Packet 22: Link block 23: Run-in block 24: User data block 25: Run-out block

Claims (4)

[Claims] 1. A plurality of tracks are formed in a recording area of a rewritable optical disk, each track is divided into a plurality of packets, and the number of user data blocks of each packet in one track is fixed to the same number. In a fixed-length packet write type optical disk recording apparatus that collectively records information every time, information of a user data block of each packet in the track is read and stored in a buffer, and the packet length of each information is changed. An optical disk recording apparatus, further comprising means for re-recording data in the track. 2. The optical disk recording apparatus according to claim 1, wherein a total number of blocks is obtained by changing the packet length, and when the total number of blocks exceeds the capacity of the track, the re-recording is stopped and an error is generated. An optical disk recording device comprising a reporting unit. 3. The optical disk recording apparatus according to claim 1, further comprising means for stopping the re-recording and reporting an error when the capacity after the change of the packet length exceeds the capacity of the buffer. An optical disk recording device characterized by the following. 4. The optical disk recording apparatus according to claim 1, wherein when the capacity of the packet in the track exceeds the capacity of the buffer, the re-recording is stopped and an error is reported. An optical disk recording device comprising: