JP2002083430A - Recording/reproducing method for rewritable optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording method for a rewritable optical disk by which the effect of cross erasing during overwrite recording can be eliminated. SOLUTION: The data of an adjacent track to be lastly overwritten is stored as first data in a buffer memory 5, and second data obtained by reproducing the adjacent track to be lastly overwritten is compared with the first data after overwriting. When the second data is different from the first data, the first data is recorded in an alternative track area 10 as recording marks 105A and 106A. When the second data is similar to the first data, the data is not recorded. In reproducing, when the alternative track area 10 is reproduced, and the recording marks 105A and 106A are present in the substitution track area 10, the reproducing is carried out by reading these recording marks 105A and 106A. When the recording marks 105A and 106A are not present therein, the reproducing is carried out by directly reading the recording marks 105 and 106 of the adjacent track to be lastly overwritten.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing method for a rewritable optical disk used for recording data on a DVD (digital video disk) using a light beam.

[0002]

2. Description of the Related Art Rewritable optical disks have high recording density, high-speed accessibility, and medium portability comparable to magnetic disks, and are widely applied to image / audio files, computer files, and the like. Improvement is expected. As the technology for increasing the density of optical discs,
Mark length recording, land / groove recording, shorter light source wavelength,
Many proposals have been made, such as super-resolution reproduction and multi-level multi-level recording. Among them, land / groove recording is to record data on lands and grooves, and it can be expected that the density is approximately twice as high as that of the conventional method of recording only on lands or grooves.

When land-groove recording is employed, it is necessary to solve the problem that the track pitch is about the full width at half maximum of the laser spot and a considerable portion of the outer edge of the spot overlaps an adjacent land track or groove track. That is, if reproduction is performed without any contrivance, crosstalk is large and practical signal quality cannot be obtained.

Therefore, in land-groove recording,
The groove depth is set to about 1/6 of the laser wavelength so that the grooves are reproduced during the land reproduction and the lands are reproduced by the optical interference effect during the groove reproduction. By performing such a contrivance and a contrivance to eliminate the optical phase difference between the recorded mark and the unrecorded portion, it is possible to reproduce the signal recorded on both the land and the groove with high quality.

In the land / groove recording, there is a problem of cross erase as a problem to be solved. That is, since the width of a recording mark is about the full width at half maximum of a laser spot, when land-groove recording is adopted, recording marks formed on adjacent tracks are arranged so as to be almost in contact with each other. Therefore, at the time of recording, the end of the track adjacent to the target recording track rises to near the crystallization temperature. Therefore, when overwriting is repeated on an arbitrary recording track, the end of the recording mark of the adjacent track is gradually crystallized and information is lost.

Hereinafter, a recording / reproducing method for a rewritable optical disk for recording and reproducing recording marks on lands L1 and L2 and grooves G1 and G2 of tracks 1 to 4 will be described in detail with reference to FIG. FIG. 7 is a diagram showing a conventional recording / reproducing method for a rewritable optical disk. FIG.
In this example, lands and grooves are alternately arranged from the disk inner circumference to the disk outer circumference, and the recording operation proceeds in the direction of land L1 → groove G1 → land L2 → groove G2. Tracks 1, 2, 3, and 4 correspond to land L1, groove G1, and land L1, respectively.
2. A groove G2 is formed.

First, as shown in FIG. 7, a track 1 on the inner circumferential side of a disk in a recording track area R of the optical disk is used.
The recording marks 100 and 101 are recorded on the land L1 by the laser spot 104 in the disk rotation direction. Next, the recording mark 108 is recorded by the laser spot 104 on the groove G1 of the track 2 adjacent to the land L1 of the track 1 on the outer peripheral side of the disk.

At this time, the diameter of the laser spot 104 is larger than the track width d which is the width of the land L1 of the track 1 and the groove G1 of the track 2, and the laser spot is located at the center of the width of each land L1 and the groove G1. Since the tracking is performed on the recording mark 108,
Are protruded and recorded on the land L1 side of the track 1 and the land L2 side of the track 3.

As described above, since the recording mark 108 in the groove G1 of the track 2 is recorded so as to protrude to the portion indicated by the dotted line on the land L1 of the track 1, the recording marks 100 and 101 in the land L1 of the track 1 are recorded.
Is erased to the portion indicated by the dotted line on the land L1 of the track 1. Therefore, the recording marks 100, 10
1 is not recorded on the entire track width d of the land L1 of the track 1, but is recorded on an effective recording width b narrower than the track width d by the cross erase width c.

Next, a new recording mark 105, 1 is formed on the land L2 of the track 3 adjacent to the groove G1 of the track 2 on the outer peripheral side of the disk by the laser spot 104.
Record 06. At this time, the recording marks 105, 106
Are protrudingly recorded on the groove G1 side of the track 2 and the groove G2 side of the track 4.

Since the recording marks 105 and 106 on the land L2 of the track 3 are recorded so as to protrude up to the portion indicated by the dotted line on the groove G1 of the track 2, the recording marks 108 on the groove G1 of the track 2 are The cross erase is performed up to the portion indicated by the dotted line on G1. Therefore, the recording mark 108 is
Is not recorded on the entire track width d of the groove G1
The data is recorded in the effective recording width b which is smaller than the track width d by the cross erase width c.

Thereafter, the recording mark 107 is recorded by the laser spot 104 on the groove G2 of the track 4 adjacent to the land L2 of the track 3 on the outer peripheral side of the disk. The reproduction of the optical disk recorded in this way is performed from the track 1 to the track 4 by a conventional reproducing method.

[0013]

However, the conventional recording / reproducing method for a rewritable optical disk has the following problems. Here, as shown in FIG.
Recording marks 100, 101, and 10 up to track 4
After recording 5, 106, 107 and 108, track 2
Overwrite the groove G1 to record mark 1
Consider a case where 09 and 110 are recorded.

This will be described with reference to FIG. FIG. 8 shows that the recording marks from the land L1 of the track 1 to the groove G2 of the track 4 are formed,
FIG. 10 is a diagram showing a state when overwriting is performed on the groove G1. As shown in FIG.
Since the diameter is larger than the track width d and is tracked at the center position of the groove G1 width of the track 2, the recording marks 109 and 110 recorded by overwriting the groove G1 of the track 2 1
Is recorded on the land L1 side of the track 3 and the land L2 side of the track 3.

Since the effective recording width is not equal to or more than the track width d, the recording mark 1 on the groove G1 of the track 2
The effective recording width b1 of 09 and 110 becomes the track width d. Recording mark 100 on land L1 of track 1;
The effective recording width b of 101 is smaller than the track width d by the cross erase width c, and the effective recording width b2 of the recording marks 105 and 106 on the land L2 of track 3 is cross-erased on both sides of the land L2 of track 3. Therefore, the cross erase width c is twice as narrow as the track width d.

As described above, the effective recording width b2 of the recording marks 105 and 106 recorded on the land L2 of the track 3
Is so narrow that the entire recorded data cannot be played back during playback, so the level of the playback signal is reduced, noise is mixed into the playback data, and under worst-case conditions, the playback data There was a problem that it became impossible to obtain.

As a countermeasure against this, Japanese Patent Publication No. 10-24116
No. 3 discloses that every time a data signal is recorded on an arbitrary recording track, the number of rewritings is recorded in a predetermined area of the recording track, and a difference in the number of rewritings between the recording track and an adjacent recording track is detected. When the difference exceeds a preset number of times, a method of re-recording a data signal recorded on an adjacent track, a pseudo signal is recorded on an arbitrary recording track, and this pseudo signal is detected at an appropriate interval. A method for re-recording a data signal recorded on a recording track when signal degradation exceeds a preset range is disclosed.

However, in this method, the data signal recorded on the recording track is re-recorded even if the signal quality of the pseudo signal is deteriorated by one overwrite. If the data signal deteriorates due to the effect of the re-recording, it becomes necessary to re-record the data signal.
All data signals need to be re-recorded. Also,
Re-recording of the deteriorated data is repeated, which may cause a problem that a data signal different from the original data signal is recorded. Further, since the outer track is reproduced after overwriting, data before recording cannot be completely re-recorded due to cross erase, and this data cannot be reproduced as before.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and is intended to eliminate the influence of cross-erase at the time of overwrite recording and to perform a good reproduction. It is an object of the present invention to provide a recording / reproducing method.

[0020]

According to a first aspect of the present invention, there is provided a recording / reproducing method for a rewritable optical disk, comprising a recording track area having tracks adjacent to each other and an alternative track area. After performing overwrite recording on the recorded optical disc,
A recording / reproducing method for a rewritable optical disk for reproducing, comprising: using a recording mark on a plurality of tracks in the recording track area, and then performing overwriting based on an amount of data to be overwritten on a part of the plurality of tracks. After calculating the position of the last adjacent track to be overwritten, the data of the last adjacent track to be overwritten is stored in the buffer memory as the first data. The second data obtained by reproducing a track adjacent to the first data is compared with the first data. If the second data is different from the first data, the first data is used as an alternative recording mark. Recording in the alternative track area,
When the data is the same as the first data, the data is not recorded in the alternative track area, and when reproducing a plurality of tracks in the recording track area, the reproduction of the overwritten last adjacent track is performed. When the alternative recording mark is present in the alternative track area, the recording mark of the last adjacent track to be overwritten is replaced with the alternative recording mark and read.
When there is no alternative recording mark in the alternative track area, the recording mark of the overwritten last adjacent track in the recording track area is directly read and performed. According to a second aspect, in the recording / reproducing method for a rewritable optical disk according to the first aspect, address information of the first data is recorded in the alternative track area. According to a third aspect, in the recording / reproducing method for a rewritable optical disk according to the first or second aspect, the alternative track area has a wide track width which is not affected by overwriting. According to a fourth aspect of the present invention, in the recording / reproducing method for a rewritable optical disc according to claim 1 or 2, the first data stored in the buffer memory is recorded every other track in a track of the alternative track area. And According to a fifth aspect of the present invention, an overwrite-disabled track of an optical disc in which recording marks are recorded in advance on tracks formed adjacent to each other and formed in order from the inner circumference to the outer circumference is not overwritten, and other tracks are not overwritten. Is a recording / reproducing method for a rewritable optical disc for performing overwriting and then reproducing, wherein an inner track of an inner track adjacent to an inner track of the overwrite impossible track is determined by a start address of the overwrite impossible track. After calculating an address and an outer circumference start address of an outer track adjacent to the overwrite impossible track and two tracks outer circumference side from the overwrite impossible track, the overwrite is performed from the inner circumference side to the outer circumference side of the optical disc. Is started, and when the inner track start address of the inner track is reached, the The Baraito not track without overwriting, and performing overwriting subsequently from the circumferential track by the periphery start address.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A recording / reproducing method for a rewritable optical disk according to each embodiment of the present invention is shown in FIGS.
This will be described with reference to FIG. The same components as those of the conventional example are denoted by the same reference numerals, and description thereof will be omitted. First, a first embodiment of the present invention will be described with reference to FIGS. FIG.
FIG. 1 is a block diagram showing a rewritable optical disk device according to a first embodiment of the present invention. FIG. 2 is a flowchart for explaining a recording / reproducing method for a rewritable optical disk in the first embodiment according to the present invention. FIG.
FIG. 3 is a diagram showing a state where OWOT data is recorded in a substitute track area on an optical disc. FIG. 3 shows a track 3 shown in FIGS. 4 and 5 used for explaining the conventional example.
This shows that the recording marks 105 and 106 of the land L2 are read into the buffer memory 5 before overwriting, and are recorded in the alternative track area 10 on the optical disk 2 after overwriting.

As shown in FIG. 1, a rewritable optical disk apparatus 1 is an optical pickup for recording and reproducing RF signals on an optical disk 2 having an alternative track area 10 (FIG. 3) formed on the inner peripheral side of a recording track area R. 3, and during playback,
A signal read from the optical pickup 3 is binarized and output as a reproduction signal. At the time of recording, the recording signal is converted into a recording signal pulse, and RF output to the optical pickup 3 is output.
A signal processing unit 4, a buffer memory 5 for storing recording and reproduction signals, a reproduction signal processing unit 6 for decoding a reproduction signal from the buffer memory 5, and a recording signal for encoding input data and outputting a recording signal When overwriting the recording track area R of the optical disk 2 with the processing unit 7, the data amount input from the recording signal processing unit 7 and the address position at which overwriting starts and the outer position adjacent to the track to be overwritten are determined. Truck (hereinafter referred to as Overwrite Outside Truck or OWOT)
An overwrite outside track calculation unit 8 (hereinafter abbreviated as an OWOT calculation unit 8) for calculating a position, and is read from the optical disk 2 into the buffer memory 5 based on the calculation result of the OWOT calculation unit 8 before overwriting is started. The stored OWOT data is compared with the overwritten OWOT data. If the OWOT data is different from the OWOT data before starting the overwriting, the OWOT data read before the overwriting is started.
The data comparison unit 9 issues a command to record T data in the alternative track area 10 and, if the same, does not issue a command to record to the alternative track area 10. In addition,
On the optical disk 2, the recording data includes a recording mark 10.
0, 101, 102, 103, 105, 106, 10
7, 105A and 106A.

Next, a recording / reproducing method for a rewritable optical disk according to the first embodiment of the present invention will be described. Here, overwriting is performed on track 2 on the optical disk 2 on which data is recorded as recording marks 100, 101, 105 to 108 on the tracks 1 to 4 shown in FIG. 7 in advance, and the recording is performed as shown in FIG. Mark 10
Consider the case where 2, 103 are recorded and reproduced. First, in step 11, a command to record data on track 2 of the recording track area R of the optical disk 2 is sent, and in step 12, it is determined whether or not this track 2 is a track to be overwritten.

In step 13, when data is overwritten on track 2, the OWOT calculation unit 8 calculates the OWOT position on the basis of the amount of data to be overwritten. After the OWOT data recorded as the recording marks 105 and 106 on the land L2 of the track 3 at the outer position adjacent to G1 is read by the optical pickup 3, the RF signal processing unit 4
And stores it in the buffer memory 5.

Next, in step 15, the data is overwritten and recorded in the groove G1 of the track 2 as the recording marks 102 and 103, and then in step 16 as the recording marks 105 and 106 in the land L2 of the track 3. Play recorded OWOT data. After this,
In step 17, the reproduced OWOT data is compared with the OWOT data previously stored in the buffer memory 5 by the data comparing unit 9. In step 18, the reproduced O
OWOT before WOT data starts overwriting
If the data is different from the data, the OWOT data stored in the buffer memory 5 is stored in the recording marks 105A and 106A.
A is recorded in the alternative track area 10 shown in FIG.
If the reproduced OWOT data is the same as the OWOT data before the start of overwriting, the recording is not performed on the alternative track area 10.

The track width of the alternative track area 10 may be a wide track width which is not affected by overwriting, or may be the same track width d as the recording track area R. When the track width d is the same, if the OWOT data stored in the buffer memory 5 is recorded every other track, cross-erase due to overwriting of the alternative track area 10 can be prevented.

Reproduction is performed as follows. In step 19, when the tracks 1 to 4 are reproduced, when the OWOT data is reproduced, if the recording marks 105A and 106A are present in the alternative track area 10, the recording marks 105 and 106 of the recording track area R are replaced. The data is read in place of the recording marks 105A and 106A recorded in the track area 10 and reproduced through the reproduction signal processing unit 6. The recording marks 105A, 10A
If there is no 6A, the recording marks 105 and 106 recorded in the recording track area R are read as they are and reproduced through the reproduction signal processing unit 6 in step 20.

As described above, the recording marks 100, 101, 105 to 10 are recorded on the tracks 1 to 4 in the recording track area R.
8, the position of the last adjacent track to be overwritten is calculated based on the amount of data to be overwritten on track 2, and then the recording marks 105, 10 and 10 of the last adjacent track 3 to be overwritten are calculated.
The OWOT data recorded as No. 6 is stored in the buffer memory 5, and then a recording mark 102
After performing overwriting as 103, the OWOT data obtained by reproducing the track 3 is compared with the data stored in the buffer memory 5 before overwriting.
If the OT data is different from the OWOT data stored in the buffer memory 5, the data stored in the buffer memory 5 before overwriting is stored in the recording mark 10.
5A and 106A are recorded in the alternative track area 10,
Buffer memory 5 before OWOT data is overwritten
In the case where the data is the same as the data stored in the alternative track area 10, the recording is not performed in the alternative track area 10, and when the tracks 1 to 4 are reproduced, the reproduction marks of the track 3 have the recording marks 105 A and 106 A in the alternative track area 10. In this case, the recording marks 105 and 106 in the recording track area R are read and replaced by the alternative recording marks 105A and 106A. When the recording marks 105A and 106A do not exist in the alternative track area 10, the tracks in the recording track area R are read. 3
Therefore, even if overwriting is repeatedly performed, the effects of cross-erasing can be completely removed, and good reproduction can be performed.

Since it is not a method of re-recording data as in the conventional example, OWOT recorded before overwriting is not performed.
The data can be reproduced without deterioration. If the OWOT address information is recorded in the alternative track area 10 together with the OWOT data, the OWOT data must be present in the alternative track area 10 due to the presence of the OWOT address information when the data is reproduced. Can be easily confirmed.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIGS. The same components as those in the first embodiment of the present invention are denoted by the same reference numerals, and description thereof will be omitted. FIG.
FIG. 9 is a plan view showing a state in which overwriting is performed on a recording track area of the optical disc of the second embodiment according to the present invention. FIG. 5 is a block diagram showing a rewritable optical disk device according to a second embodiment of the present invention. FIG.
FIG. 7 is a flowchart for explaining a recording / reproducing method for a rewritable optical disk in a second embodiment according to the present invention.

In the second embodiment of the present invention, after recording data is recorded as recording marks on tracks 1 to 7 adjacent to a recording track area on the optical disk 21 from the inner peripheral side to the outer peripheral side of the disk, The overwrite recording marks 206 and 207 to be recorded on the inner track 2 adjacent to the tracks 3 and 4 are not overwritten on the track 2 and the second tracks adjacent to the outer tracks of the tracks 3 and 4 are not overwritten. Overwrite the track. First, the optical disc 21 will be described in detail. Tracks 3 and 4 are overwrite-disabled tracks, and tracks 1, 2, 5, 6, and 7 are overwrite-permitted tracks. An overwrite disabled track is a track that does not overwrite. That is, this is a track that does not overwrite the recording data before overwrite recording, but leaves the original recording data as it is. The overwriting permitted track is a track for which overwriting is permitted. That is, it is a track on which new recording data is recorded by overwriting the already recorded data.

As shown in FIG. 4, track 1 has overwrite recording marks 204 and 205, and track 2 has original recording mark 200 which has not been overwritten.
However, the original recording marks 201 and 202 that have not been overwritten are recorded on track 3 and the original recording marks 203 that are not overwritten are recorded on track 4.
Has overwrite recording marks 206 and 207 to be recorded in place of track 2. Tracks 1, 3, 5, and 7 form lands L1, L2, L3, and L4, respectively, and correspond to tracks 2, 3, 5, and 7, respectively.
4 and 6 correspond to the grooves G1, G2 and G, respectively.
3 is formed. Tracks 5 and 7 record original recording marks (not shown) that have not been overwritten.

In this case, the effective recording width of the recording mark on each track is as follows. As described above, since the diameter of the laser spot 104 is larger than the track width d and is tracked at the center position of the track 1 and the track 3, the recording marks 204 and 205 and the track The recording marks 201 and 202 recorded on the track 3 are recorded on the track 2 side. Since the effective recording width is not equal to or greater than the track width d, the effective recording width b1 of the recording marks 204 and 205 recorded on the track 1 is the track width d, and the recording mark 2 recorded on the track 2
The effective recording width b3 of 00 is obtained by subtracting twice the cross erase width c from the track width d.

Since the recording mark 203 of the track 4 is recorded on the track 3 so as to protrude, the recording mark 2
The effective recording widths b2 of 01 and 202 are obtained by subtracting the cross erase width c from the track width d. Since the recording mark (not shown) of the track 5 is recorded on the track 4 so as to protrude by the cross erase width, the effective recording width b2 of the recording mark 203 of the track 4 is obtained by subtracting the cross erase width c from the track width d. It is.

Since the recording marks 206 and 207 of the track 6 are recorded on the track 5 so as to protrude, the relationship is the same as that of the tracks 3 and 4. The effective recording width of the recording mark (not shown) of the track 5 is the track width. This is obtained by subtracting the cross erase width c from d. Since the overwritten recording marks 206 and 207 are recorded on the track 6 so as to extend over the tracks 5 and 7, the effective recording width b1 is the track width d. Since the recording marks 206 and 207 of the track 6 protrude from the track 7 and are recorded, the effective recording width b2 of the track 7 is
The relationship is the same as that of 4 or 5, and the cross erase width c is subtracted from the track width d.

Next, the recording marks 200, 201, 20
2 and 203 are recorded on tracks 2 to 4,
Recording marks 204 and 205 are added to track 1 and track 6
A recording / reproducing method in the case where the recording marks 206 and 207 are overwritten will be described. First, a rewritable optical disk device 22 for recording and reproducing the optical disk 21 will be described with reference to FIG. As shown in FIG. 5, the rewritable optical disk device 22 includes an optical pickup 3 for recording and reproducing an RF signal on and from the optical disk 21 and, at the time of reproduction, binarizing a signal read from the optical pickup 3 and outputting it as a reproduction signal. At the time of recording, the recording signal is converted into a recording signal pulse and output to the optical pickup 3, an RF signal processing unit 4, a buffer memory 5 for storing recording and reproduction signals, and a reproduction signal from the buffer memory 5 are transmitted. A reproduction signal processing unit 6 for decoding processing, a recording signal processing unit 7 for encoding input data and outputting a recording signal, and a track previously recorded in a file management area (not shown) when overwriting on the optical disc 21 Start address Sa1 of track 3 (overwrite disabled track) and end address of track 4 (overwrite disabled track) From less Ea1, the inner peripheral side adjacent to the track 2
(Overwrite Permitted Track) Start Address Sa2
And an address calculation unit 23 which calculates a head address Sa3 which is adjacent to the track 4 and is recorded in advance in a file management area (not shown) of the track 6 on the outer side of the track 4 by two tracks.

Next, a recording method for overwriting a non-overwritable track of a rewritable optical disk without affecting the cross-erase according to the second embodiment of the present invention will be described with reference to FIG. Recording and playback
It is performed from the inner circumference side of the disc toward the outer circumference side.
Here, as described above, the overwrite-impossible tracks are tracks 3 and 4, and the overwrite-permitted tracks are tracks 1, 2, 5, 6, and 7.

First, in step 11, the optical disk 21
Is sent to the optical pickup 3 for recording data on track 1 and subsequent tracks. In step 12, the file management information is read from a file management area (not shown) of the optical disk 21, and it is determined whether or not there is a track to be overwritten after track 1. If there is no overwriting track, normal writing is performed.

After the track to be overwritten is determined, it is determined in step 13 whether or not there is a track that cannot be overwritten. If there are no overwrite-disabled tracks, that is, if all tracks are overwrite-permitted tracks, step 1
In step 4, overwriting is performed. If there is an overwrite-disabled track, in step 15, the start address Sa1 of track 3 and the end address Ea1 of track 4 are read from the file management area (not shown) of the optical disk 21 as file management information.

In step 16, the radial position of the track 3 from the center of the optical disk 21 is obtained from the start address Sa1 of the track 3, and the address of one track is subtracted from this radial position to obtain the track 3 on the inner circumferential side. The start address Sa2 of the adjacent track 2 is calculated by the address calculation unit 23. Also, the end address E of the track 4
The address of one track corresponding to the radial position is added from a1 to be adjacent to this track 4 and
From the start address Sa of track 6 on the outer side of two tracks
3 is calculated by the address calculator 23.

In step 17, the recording signal processed by the recording signal processing unit 7 is stored in the buffer memory 5, converted by the RF signal processing unit 4, and
1 to start overwriting the recording marks 204, 2
05 is recorded on track 1.

In step 18, the address calculation unit 23 determines whether the head address Sa2 of the track 2 has been reached during overwriting. If the overwriting is performed to the end without reaching the start address Sa2, the process ends. If the head address Sa2 of the track 2 has been reached, the optical pickup 3 is moved to the head address Sa3 of the track 6 in step 19, and then overwriting is started again to record the recording marks 206 and 207 on the track 6. I do. Thereafter, the start address of track 1, the start address Sa2 of track 2, the start address Sa3 of track 6, and the end address Ea1 of track 4 are recorded in a file management area (not shown) of the optical disk 21. The recording mark 200 of the track 2 is an unnecessary recording mark that is not reproduced.

Reproduction is performed as follows. The file management area (not shown) of the optical disk 21 is read by the optical pickup 3 and binarized by the RF signal processing unit 4 to obtain a reproduced signal. After the reproduced signal is stored in the buffer memory 5, the reproduced signal is processed by the reproduced signal processing unit 6. By performing decryption processing, management information of a file management area (not shown) is obtained.

Next, based on the management information, the start address of the data at which overwriting has started, the start address Sa2 of track 2, the start address Sa3 of track 6, and the end address Ea1 of track 4, which are the breaks in the data
, The recording marks 201, 202, 203, 204, 205, 206, 2
07 is read out by the optical pickup 3 and binarized by the RF signal processing unit 4 to obtain a reproduced signal. The reproduced signal is stored in the buffer memory 5 and then decoded by the reproduced signal processing unit 6. While doing truck 1
When the reproduction signal processing unit 6 detects the start address Sa2 of the track 2 and moves the optical pickup 3 to the start address Sa3 of the track 6,
Playback starts from track 6 again.

As described above, when overwriting the recording data recorded from the inner circumference side to the outer circumference side of the optical disc 21, when overwriting the recording data from the head address Sa1 of the track 3 to the track 2 adjacent to the inner circumference side of the track 3, The start address Sa2 of the track 2 is calculated by the address calculation unit 23, and the start address Sa3 of the track 6 adjacent to the track 4 from the end address Ea1 of the track 4 and on the outer circumference side of the track 4 from the track 4 is calculated. Sa2
Is reached, the overwriting is continued from the head address Sa3 of the track 6, so that the tracks 3 and 4 can be overwritten any number of times without affecting the cross erase. As a result, it is possible to perform good reproduction in which the influence of the cross erase at the time of recording is removed.

Unlike the method used in the second embodiment of the present invention, the start address Sa2 of the track 2 and the start address Sa3 of the track 6 are calculated at the time of erasing the recording data on the optical disk 21, and are calculated in advance. It may be recorded in the file management area of the optical disc 21. Also, in the first recording, if there is a recording mark of an overwritable track after the recorded track, recording is performed on an inner track adjacent to the inner circumference side of the overwrite disabled track and an outer circumference track adjacent to the outer circumference side. If you do not
Tracks that cannot be overwritten are not affected by cross-erase, so that good reproduction can be performed without the effect of cross-erase.

In the above embodiment, the case where data is recorded on both land and groove has been described. However, the present invention can be applied to the case where data is recorded on either land or groove. In addition, as the optical disk 2, a phase change recording medium, a magneto-optical recording medium, or the like can be used.

[0048]

According to the present invention, reproduction is performed after performing overwrite recording on an optical disk which is formed from a recording track area having tracks adjacent to each other and a replacement track area, and which is recorded in advance in this recording track area. A recording / reproducing method for a rewritable optical disk, comprising: recording data on a plurality of tracks in the recording track area using recording marks; and performing overwriting based on an amount of data to be overwritten on a part of the plurality of tracks. , The data of the last adjacent track to be overwritten is accumulated in the buffer memory as the first data, and then overwritten, and then the overwritten last adjacent data is stored. The second data obtained by reproducing the track to be read is compared with the first data. If the data is different from the first data, the first data is recorded as an alternative recording mark in the alternative track area, and if the second data is the same as the first data, the alternative track is recorded. When performing reproduction of a plurality of tracks in the recording track area without recording in the area, when reproducing the overwritten last adjacent track, if the alternative recording area has the alternative recording mark, The recording is performed by replacing the recording mark of the adjacent track at the end of the overwriting with the alternative recording mark, and if the alternative recording mark does not exist in the alternative track area, the overwriting last in the recording track area is performed. Since the recording mark of the adjacent track is read as it is, Even, can completely remove the influence of the cross erase, it is possible to perform a good reproduction. No overwriting is performed on non-overwritable tracks of an optical disc in which recording marks are recorded in advance on tracks formed adjacent to each other and in order from the inner circumference to the outer circumference, and overwriting is performed on other tracks. Recording / reproducing a rewritable optical disc to be reproduced afterwards, wherein the inner address of the inner track adjacent to the inner side of the overwrite-inhibited track is determined by the head address of the overwrite-inhibitable track; After calculating the outer circumference start address of the outer track adjacent to the impossible track and two tracks on the outer circumference side from the overwrite impossible track, overwriting is started from the inner circumference side to the outer circumference side of the optical disc, and When the inner track start address of the inner track is reached, the overwriting is not possible. The rack without overwriting, since the overwriting subsequently from the circumferential track by the outer peripheral leading address, without affecting the cross erase overwriting not track can be overwritten multiple times. As a result, it is possible to perform good reproduction in which the influence of the cross erase at the time of recording is removed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a rewritable optical disk device.

FIG. 2 is a flowchart for explaining a recording / reproducing method for a rewritable optical disk in the embodiment of the present invention.

FIG. 3 is a diagram showing a state where OWOT data is recorded in a substitute track area on an optical disc.

FIG. 4 is a plan view showing a state when overwriting a recording track area of an optical disc according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing a rewritable optical disk device according to a second embodiment of the present invention.

FIG. 6 is a flowchart for explaining a recording / reproducing method for a rewritable optical disk in a second embodiment according to the present invention.

FIG. 7 is a diagram showing a conventional recording / reproducing method for a rewritable optical disk.

FIG. 8 is a diagram showing a state where overwriting is performed on the groove G1 of the track 2 after recording marks from the land L1 of the track 1 to the groove G2 of the track 4 are formed.

[Explanation of symbols]

1, 22: rewritable optical disk device, 2: 21, optical disk, 3: optical pickup, 4: RF signal processing unit, 5
... Buffer memory, 6 ... Reproduction signal processing unit, 7 ... Recording signal processing unit, 8 ... OWOT calculation unit, 9 ... Data comparison unit, 10
... alternate track area, 23 ... address calculator, 105,
106, 200, 201, 202, 203, 204, 2
05, 206, 207: recording mark, 105A, 106
A: Recording mark (alternative recording mark),

Continued on the front page F term (reference) 5D044 BC06 CC06 DE03 DE17 DE27 DE35 DE48 DE57 DE75 EF05 5D090 AA01 BB04 CC06 DD03 EE02 EE06 EE16 FF04 FF15 FF26 FF34 GG10 GG34 GG34

Claims (5)

[Claims] An overwrite recording is performed on an optical disk formed of a recording track area having tracks adjacent to each other and a substitute track area, and recording data is previously recorded as a recording mark in the recording track area, and then reproduced. A recording / reproducing method for a rewritable optical disk, comprising: recording data on a plurality of tracks in a recording track area using recording marks; and performing overwriting based on an amount of data to be overwritten on a part of the plurality of tracks. , The data of the last adjacent track to be overwritten is accumulated in the buffer memory as the first data, and then overwritten, and then the overwritten last adjacent data is stored. Data obtained by reproducing a track to be read and the first data
Comparing the first data with the first data, if the second data is different from the first data, the first data is recorded as an alternative recording mark in the alternative track area, and the second data is compared with the first data. In the same case, when performing reproduction of a plurality of tracks in the recording track area without recording in the alternative track area, reproduction of the overwritten last adjacent track is performed in the alternative track area in the alternative track area. If there is an alternative recording mark, the recording mark of the adjacent track at the end of the overwriting is replaced with the alternative recording mark and read. If there is no alternative recording mark in the alternative track area, the recording is performed. It is preferable that the recording mark of the last adjacent track in the overwritten track area in the track area is directly read and performed. Method of recording and reproducing a rewritable optical disc according to symptoms. 2. The method according to claim 1, wherein the address information of the first data is recorded in the alternative track area. 3. A recording / reproducing method for a rewritable optical disk according to claim 1, wherein said alternative track area has a wide track width which is not affected by overwriting. 4. The first memory stored in the buffer memory.
3. The recording / reproducing method for a rewritable optical disk according to claim 1, wherein data is recorded every other track on the track in the alternative track area. 5. An overwrite impossible track of an optical disk in which recording marks are recorded in advance on tracks adjacent to each other and formed in order from the inner circumference to the outer circumference is not overwritten, and the other tracks are not overwritten. Is a recording / reproducing method for a rewritable optical disk for reproducing after overwriting, wherein an inner circumference start address of an inner circumference track adjacent to an inner circumference side of the overwrite disabled track is determined by a start address of the overwrite disabled track. When,
After calculating the outer circumference start address of an outer track adjacent to the overwrite impossible track and two tracks outer circumference side from the overwrite impossible track, overwriting is started from the inner circumference side to the outer circumference side of the optical disc. When the inner track start address of the inner track is reached, overwriting is not performed on the overwrite-disabled track, and overwriting is continuously performed from the outer track using the outer track start address. An optical disk recording and reproducing method.