JP3248193B2 - Recording / reproducing method of recording medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording medium such as an optical disk and a data recording apparatus, and more particularly to an improvement in the reliability of read-only data.

[Prior art]

The format of 3.5 inch and 5 inch continuous servo type optical discs is ISO
(International Organization for Standardization). Currently, optical disk of ISO format has begun to be used as a peripheral storage device co down computer. It is conceivable that desired software and data are recorded on this ISO format mat optical disk and sold. As described above, when the ISO format optical disk is used for reproduction only, it is conventionally required to inspect the disk. For this reason, the shipping period of the disk is lengthened and the cost is increased.

[0003] That is, in the ISO format optical disc, the data capacity of one sector is 512 bytes. Then, for example, error correction processing is performed using an LCD (long distance code) having an interleave length of 5. However, such an error correction code does not have sufficient correction capability for burst errors. When data is recorded, replacement sector processing can be performed to deal with error sectors. However, in a read-only disk, replacement sector processing is impossible in principle. For this reason, when a read-only disc is sold, there is a very high possibility that a disc in which an error has occurred will be distributed unless the error state of each disc is checked.

[0004]

As described above, the conventional I
In the case of SO-format optical disks, when a read-only disk is sold, it is necessary to check the error state of each disk. For this reason, there arises a problem that the shipping period of the disk is lengthened and the cost is increased.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a data recording medium which is not affected by an error even if a read-only recording medium in which replacement sector processing cannot be performed is sold without inspection.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a sector unit.
Data is recorded / reproduced in at least
Identify a read-only recording medium and a recording medium that performs recording / reproduction.
An identification signal for identification is recorded, and recording / reproduction is performed.
Error correction code added in sector units when the medium is medium
When the recording medium is a read-only recording medium, n sectors
Error correction code is added in units (n is a positive integer)
From the recording medium reading an identification signal, read out the identification
The type of recording medium is identified based on the signal, and based on the identification result.
The recording medium was a recording medium for recording / reproducing
Kiniwa, and access to each sector, performs a recording / reproducing, identification
If the recording medium is a read-only recording medium based on another
, Access is performed every n sectors and reproduction is performed.
This is a recording / reproducing method for a recording medium .

According to the present invention , an area capable of processing alternate sectors is provided.
And an area where replacement sector processing is not possible.
Areas where spare sector processing is possible and areas where spare sector processing is not possible
The discrimination information for discriminating the replacement sector is recorded.
Error-correcting codes are assigned in sector units on manageable areas.
In the area where replacement sector processing is not possible, n sectors
(N is a positive integer) unit with error correction code added
The identification information is read from the recording medium, and the read identification information is read.
The area of the recording medium is
Rear area or an area where replacement sector processing is not possible.
The area of the recording medium based on the result of the determination.
Is an area that can be processed by the replacement sector,
Access to every data, performs a recording / reproducing, based on the determination result
And the area of the recording medium is an area where
If there is, access is made every n sectors and playback is performed.
This is a recording / reproducing method of a recording medium to be performed .

[0008]

[0009]

[Action] In the case of recording / reproducing data capable replacement sector process the sector S _ISO 512 bytes so as to facilitate Hyde ring is used. If the replacement sector processing non reproduction-only data is used sector S _CD of (512 × 5 = 2560 bytes). (512 × 5 = 256
With sector S _CD of 0 bytes) can interleave depth for example 25, it is raised a correction capability for burst errors. For this reason, even if an optical disk containing read-only data or software is shipped without inspection, no problem due to an error occurs.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. According to the present invention, data of an ISO format optical disk in which the data capacity of one sector is, for example, 512 bytes, and one block of 98 frames corresponds to one sector, and the data capacity of one sector does not include a subcode. The data is applied to an optical disk that can be used in common with data of an optical disk in a CD format, which is 2352 bytes and 2450 bytes including a subcode. The optical disk and a recording / reproducing apparatus for recording / reproducing the same will be described.

FIG. 1 shows an outline of the optical disc 1. In FIG. 1, as the optical disk 1, for example, a magneto-optical disk can be used. Of course, a read-only optical disk or a write-once optical disk may be used. The optical disc 1 has an outer diameter of, for example, 64 mm. As described above, the optical disc 1 has a small outer diameter, and is easy to handle. Tracks are formed on the optical disc 1 in a spiral shape, for example.

This optical disk 1 uses a servo system.
For example, a sample servo method is adopted. In the sample servo method, tracking control and data reproduction can be performed with one beam, so that the servo mechanism can be simplified, and the time when the servo signal is reproduced from the optical disk and the time when the data signal is reproduced are different. This is because the servo signal and the data signal can be easily separated and processed. The rotation of the optical disk of the sample servo system is normally controlled by CAV (constant angular velocity). This is because, if the rotation of the optical disk of the sample servo system is controlled by the CLV, the servo areas will not be arranged in a straight line extending in the radial direction, and a problem of crosstalk will occur. However, when the optical disc is controlled by CAV, the recording density on the outer periphery is set depending on the recording density on the innermost periphery, so that there is a margin in the recording density on the outer periphery and the recording capacity cannot be improved.

Therefore, in the optical disc 1 to which the present invention is applied, the entire recording area of the optical disc 1 is moved from the inner peripheral side to the outer peripheral side, for example, in four zones Z as follows.
The optical disk 1 is divided into 1, Z2, Z3, and Z4, and the rotation of the optical disk 1 is controlled by CAV for each zone. When the CAV control is performed for each of the zones Z1, Z2, Z3, and Z4 as described above, the recording capacity can be increased and the influence of crosstalk does not occur. Zone Z1: 14.67 mm to 20.07 mm Number of tracks 3857 Zone Z2: 20.07 mm to 24.70 mm Number of tracks 3307 Zone Z3: 24.70 mm to 29.34 mm Number of tracks 3314 Zone Z4: 29.34 mm to 30.50 mm Tracks Number 828

Each track has a plurality of sectors S _ISO , S
_ISO, S _ISO, is divided ... into. This sector S _ISO , S
_ISO, S _ISO, ... size of is set to a convenient size to shared by the ISO format of the data and CD data format. Specifically, this sector S
_{ISO, S ISO, S ISO,} ... the recording capacity of the user data is 512 bytes. Note that the total capacity of the sector S _ISO is 512 bytes of user data including an error correction code and control information.
12 bytes or more. The capacity of this 512-byte user data is equal to the data capacity of one sector in the ISO format. Therefore, when recording data in the ISO format, the data of each sector is recorded as it is in the sectors S _ISO , S _ISO , S _ISO,.

On the other hand, in the CD format, 1
Sector (block) capacity is 2 without including subcode
It is 352 bytes, and 2450 bytes including the subcode. When recording one sector of data in such a CD format, the sectors S _ISO , S _ISO ,
S _ISO ,... Are collected for 5 sectors, and this sector S _ISO , S
Sector S _CD , which is composed of five _ISO , S _ISO , ...
S _CD , S _CD ,... Are CD format sectors.
5 sectors of 512 bytes S _ISO , S _ISO , S _ISO , ...
When collected, a data recording capacity of 512 × 5 = 2560 (bytes) is generated. The recording capacity of this 2560-byte user data is sufficient to record one sector of data in the CD format (2352 bytes without including the subcode, 2450 bytes when including the subcode).

In this optical disc 1, each zone Z1, Z
Sectors S arranged per track in 2, Z3 and Z4
The number of _ISOs is a multiple of 5 (30 in zone Z1, 40 in zone Z2, 50 in zone Z3, and 60 in zone Z4). When recording data in the CD format, five sectors are collected to form sectors S _CD , S _CD , S _CD ,... For the CD format. As described above, if the number of sectors arranged per track is set to a multiple of 5, sectors S _CD and S _CD for CD format are used.
_CD, S _CD, ... and, as an integer number distribution set on one track. That is, in the optical disc 1, in the zone Z1, six CD sectors S _CD , S _CD , S _CD ,.
And in zone Z2, eight Cs per track
D sectors S _CD , S _CD , S _CD ,... Can be arranged. In zone Z3, ten CD sectors S _CD , S _CD , S _CD ,. Sectors S _CD , S _CD , for 12 CDs per track
S _CD , ... can be arranged.

Next, a recording format for recording data on the optical disk will be described. When recording / reproducing data in the ISO format on the optical disc 1, the data conforms to the ISO format as shown in FIG. That is, as shown in FIG.
And 14 bytes of control data in two bytes of user data, 4 bytes of CRC data is added, are 5 3 0 bytes of data. This data is read out in the column direction /
Is written, 106 rows are arranged two-dimensionally in five rows. Then, a parity of 16 bytes for error correction is generated and added in the row direction. In this case, the interleave depth is 5.

When recording / reproducing data in the CD format, the data is arranged as shown in FIG.
FIG. 3 shows a case where, for example, data of a music CD is recorded.

As shown in FIG. 3, user data is divided into 294-byte data groups DT1 to DT8, and two-dimensionally arranged as shown. Data read / write is performed in the column direction. The data group DT1 is the upper bytes L _0f , L _2f ,... Of the even data of the left channel.
Data group DT2 is, the even-numbered data of the left channel lower bar
Ito L _0L, L _2L, is ... a. The data group DT3 is the upper bytes R _0f , R _2f ,... Of the even data of the right channel. The data group DT4 is the lower bytes R _0L , R _2L ,... Of the even data of the right channel. The data group DT5 is
The lower byte L _1L , L _3L ,... Of the odd data of the left channel.
It is said. The data group DT6 includes upper bytes L _1f , L _3f ,... Of the odd data of the left channel. Data group DT
7 is the lower byte R _1L of the odd data of the right channel,
R _3L,. The data group DT8 is the lower-order bytes R _1f , R _3f ,... Of the odd data of the right channel. In addition,
f indicates an upper byte (1 byte), and 1 indicates a lower byte (1 byte).

In each of the data groups DT1 to DT8, 12-byte subcodes P to W are arranged in the column direction. Further, the data groups DT1 to DT8 include:
A 2-byte control data CTL and a 4-byte CRC code for error detection are provided.

A parity P3 is generated and added in the row direction to the data of the data groups DT1 to DT4. A parity P4 is generated and added in the row direction to the data of the data groups DT5 to DT8. As the parities P3 and P4, simple parities (53, 52, 2) are used.

A parity P1 is generated and added in the column direction to the data of the data groups DT1 to DT8. As the parity P1, a simple parity (25, 24,
2) is used.

Further, a parity P2 is generated and added in the row direction to the data of the data groups DT1 to DT8. As the parity P2, a (122, 106, 17) Reed-Solomon code is used. Data generated as shown in FIG. 3 is recorded / reproduced sector S _CD for CD format.

Further, it is assumed that reproduction-only data is recorded on the optical disk 1 and sold. In the case of the CD format, there is no problem even in the case of read-only data, but in the conventional ISO format, the interleave length is 5, and the correction capability for burst errors is not sufficient. Therefore, in the optical disc 1 to which the present invention is applied,
When recording data of ISO format as reproduction-only data, as shown in FIG. 4, 5 sectors of data ISO format 106 lines, it is two-dimensionally arrayed in 25 rows. Then, a parity of 16 bytes for error correction is generated and added in the row direction. In this case, the interleave depth is 25. For this reason, the error correction capability for a burst error is increased, and it is possible to eliminate the need for inspection when dealing with read-only data.

As described above, when recording reproduction-only data, data of five sectors in the ISO format is treated as one sector. In this case, the sectors S _CD , S _CD , S _CD ,... For the CD format may be accessed.

Therefore, as shown in FIG. 5, when performing recording / reproduction, the sectors S _ISO , S of 512 bytes are used.
_ISO, S _ISO, optical disc 1A is provided with .... In the case of reproduction only, as shown in FIG.
× 5 = 2560 bytes) sectors S _CD , S _CD , S _CD , ...
Is provided. Data is recorded on the read-only disc 1B as shown in FIG. Further, as shown in FIG. 7, a recording / reproducing area 2 and a reproduction-only area 3 are provided. The recording / reproducing area 2 has 512-byte sectors S _ISO , S _ISO , S _ISO ,. The area 3 is provided with an optical disk 1C having (512 × 5 = 2560 bytes) sectors S _CD , S _CD , S _CD ,.

For example, the innermost track TR1 of the optical disks 1A, 1B and 1C is assigned to a control track. The control track TR1 has IDs for identifying the three types of optical disks 1A, 1B, and 1C.
Signal is included. By reproducing the ID signal, three types of optical discs 1A, 1B and 1C are identified. Also,
In the case of the optical disc 1C having the recording / reproducing area 2 and the reproduction-only area 3, the control track TR1 can include information on where the recording / reproduction area 2 is and where the reproduction-only area 3 is. In order to identify these three types of optical disks 1A, 1B, and 1C, holes for identification may be formed in a disk, a disk cassette, or the like. Further, an identification label or a print may be provided on a disk or a disk cassette. Various other means for identifying these three types of optical disks 1A, 1B, and 1C are conceivable.

Of course, data to be recorded / reproduced undergoes alternate sector processing, and data dedicated to reproduction cannot be subjected to alternate sector processing.

FIG. 8 shows an example of a disk recording / reproducing apparatus for recording / reproducing the optical disk 1. This optical disk recording / reproducing apparatus is provided with a SCSI interface 21. SCSI interface 21
By connecting the optical disk recording / reproducing apparatus to a computer via the PC, the optical disk recording / reproducing apparatus can be operated as a peripheral storage device of the computer. A SCSI controller 22 is provided so that data can be input / output using the SCSI interface 21.

As described above, this optical disc 1 includes:
IDO format data and CD format data are recorded / reproduced. CD and CD so that data can be recorded / reproduced on the optical disc 1 in CD format.
A ROM encoder / decoder 24 is provided; Further, the D / A converter 2 converts the audio signal decoded by the CD-ROM decoder 24 into an analog signal.
5 are provided. The reproduced audio signal is taken out as a digital signal from the digital output terminal 26, and
An analog signal is output from the analog output terminal 27.

As described above, the rotation of the optical disk 1 is controlled by the CAV for each zone by the spindle motor 11. As will be described later in detail, the optical disc 1 is rotated at a speed higher than a rotation speed for achieving a normal data transfer rate in order to improve data reliability and the like. For this reason, the data transfer rate for recording / reproducing data on the optical disc 1 is different from the data transfer rate for input / output. A RAM 18 is provided to match the data transfer rate for recording / reproducing data on the optical disc 1 with the data transfer rate for input / output. This RA
M18 is controlled by the RAM controller 23.
The control of the entire recording / reproducing apparatus is performed by the controller 28.
Made by

The magnetic head 12 faces the optical disk 1.
And the optical head 13 are provided so as to face each other.
The magnetic head 12 is driven by a magnetic head drive circuit 14. A reproduction signal of the servo area of the optical disk is supplied to the servo circuit 17 via the reproduction amplifier 19. The rotation of the spindle motor 11 is controlled by a servo circuit 17. In addition, tracking control is performed by the servo circuit 17.

At the time of data recording, data from the SCSI interface 21 or from the CD and CD-ROM encoder / decoder 24 is stored in the RAM 18,
The output of the RAM 18 is supplied to the modulation / demodulation circuit 15.
In the modulation / demodulation circuit 15, data is modulated by a predetermined modulation method. The output of the modulation / demodulation circuit 15 is supplied to the magnetic head drive circuit 14. A modulation magnetic field is generated from the magnetic head 12 by the output of the modulation / demodulation circuit 15. This modulation magnetic field is applied to the optical disc 1. At the same time, a laser beam is emitted from the optical head 13 according to the output of the laser drive circuit 16. This laser beam is applied to the optical disc 1. Thus, data is recorded on the optical disc 1 in the form of the magnetization direction of the perpendicular magnetization film.

At the time of reproduction, a laser beam from the optical head 13 is irradiated on the optical disk 1, and reflected light of the laser beam is detected. The rotation angle of the reflected light of the laser beam differs depending on the magnetization direction of the perpendicular magnetization film of the optical disc 1. The recorded data on the optical disc 1 is reproduced according to the rotation angle of the reflected light of the laser beam. The reproduction signal of the optical disk 1 is supplied to the modulation / demodulation circuit 15 via the reproduction amplifier 19. The modulation / demodulation circuit 15 demodulates the data. The output of the modulation / demodulation circuit 15 is stored in the RAM 18
Supplied to The output of the RAM 18 is decoded via the SCSI interface 21 or by the CD and CD-ROM encoder / decoder 24 and output.

When the optical disk 1 is loaded, first, the innermost control track TR1 is accessed. From the information of the control track TR1, the controller 28 determines whether the optical disk 1 is a recording / reproduction optical disk 1A, a reproduction-only optical disk 1B, or a disk 1C in which a recording / reproduction area and a reproduction-only area are mixed. You. If the optical disc 1A for recording / reproducing is attached, the sector S _ISO 512 bytes are accessed. When the reproduction only optical disc 1B is mounted, is accessed sector S _CD of (512 × 5 = 2560 bytes). When the disk 1C in which the recording / reproduction area and the reproduction-only area are mixed is mounted, a 512-byte sector _SISO is accessed in the recording / reproduction area, and (512 × 5 = 2560) in the reproduction-only area. sector S _CD is accessed in bytes).

[0036]

According to the present invention, in the case of data to be recorded / reproduced which can be subjected to alternate sector processing, a 512-byte sector _SISO is used, and read-only data which cannot be subjected to alternate sector processing is recorded. In this case, (512 × 5 = 25
Sector S _CD of 60 bytes) is used. (512 × 5
= The use of sector S _CD 2560 bytes) can interleave depth for example 25, it is raised a correction capability for burst errors. For this reason, even if an optical disk containing read-only data or software is shipped without inspection, no problem due to an error occurs.

[Brief description of the drawings]

FIG. 1 is a plan view of an example of an optical disk to which the present invention is applied.

FIG. 2 is a schematic diagram used for describing a recording format according to an embodiment of the present invention.

FIG. 3 is a schematic diagram used for describing a recording format according to an embodiment of the present invention.

FIG. 4 is a schematic diagram used for describing a recording format according to an embodiment of the present invention.

FIG. 5 is a plan view used for describing an optical disk to which the present invention is applied.

FIG. 6 is a plan view used for describing an optical disk to which the present invention is applied.

FIG. 7 is a plan view used for explaining an optical disk to which the present invention is applied.

FIG. 8 is a block diagram of an example of an optical disk recording / reproducing apparatus to which the present invention is applied.

[Explanation of symbols]

 1, 1A, 1B, 1C optical disk 24 CD and CD-ROM decoder

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-46163 (JP, A) JP-A-63-13174 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 20/12 G11B 20/10

Claims (2)

(57) [Claims] 1. Data recording / reproducing is performed in sector units.
And at least a read-only recording medium and recording /
An identification signal for identifying the recording medium to be reproduced is recorded.
When the recording / reproduction is performed on a recording medium,
An error correction code is added in units of the sector, and the
When the recording medium is a dedicated recording medium, n sector units (n is
Recording medium with error correction code added in units of (positive integer)
From the recording medium, and reads the identification signal from the storage medium based on the read identification signal.
And the recording medium performs recording / reproduction based on the identification result.
If the recording medium is a
Then, recording / reproduction is performed, and the recording medium is read-only recording based on the identification result.
When the medium is a medium, access is performed for each of the n sectors.
And a recording / reproducing method for a recording medium to be reproduced. 2. An alternate sector processable area and an alternate sector
Area that cannot be processed
Area that cannot be processed and the area that cannot be processed by the replacement sector.
The discrimination information for discriminating the replacement sector is recorded.
Error correction codes are applied in sector units on the processable area.
In the area where the replacement sector cannot be processed, n
Error correction codes are added in units of sectors (n is a positive integer).
The identification information is read from the read recording medium, and the recording medium is read out based on the read determination information.
The rear is the area where the spare sector can be processed and the spare sector
Determines which of the areas that cannot be processed
And, the intersection is the area of the recording medium based on the determination result
If the area can be replaced,
Access for each data, perform recording / reproduction, and change the area of the recording medium based on the determination result.
If the replacement sector cannot be processed, the above n
Of the recording medium for accessing and reproducing for each sector of
Playback method.