JPH1145440A - Optical disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the recording quality of data for an optical disk by effectively utilizing an OPC (laser power calibration) area. SOLUTION: OPC is executed in a PMA area (OPC area) of a CD-RW disk 1 and a resultant optimum recording laser power value is stored in a nonvolatile memory 12. Then, data consisting of plural packets to be recorded in a track of the CD-RW disk 1 are stored in a buffer 8 and the stored data in the packets is recorded based on the above optimum recording laser power value. Then, immediately after this recording, the data in a packet area are reproduced, when an error is detected by this reproduction, the OPC is executed on the CD-RW disk 1 and based on its resultant optimum recording laser power value, the data in the packet stored in the buffer 8 are superscribed in the packet area.

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 and reproducing apparatus for recording and reproducing data on an overwritable optical disk such as a CD-RW drive.

[0002]

2. Description of the Related Art Conventionally, when an optical disk such as a CD on which a plurality of data of the same content is recorded is mounted, and an error is detected in the reproduction of the data of the optical disk, the same content recorded at another place on the optical disk is detected. An optical disk device provided with a means for reproducing data (for example, see Japanese Patent Application Laid-Open No. 62-29327).
No. 7).

[0003] Further, laser power calibration (hereinafter abbreviated as "OPC") is performed on an optical disk such as a CD-R disk on which data can be additionally written, and based on the optimum recording laser power value obtained thereby. There has been an optical disk recording / reproducing apparatus such as a CD-R drive for recording data on the optical disk.

Further, a CD-R capable of overwriting data
OPC is performed on an optical disk such as a W disk, and an optimum recording laser power value obtained by the OPC is stored.
When recording data consisting of a plurality of packets on a track of an optical disk, there has been an optical disk recording / reproducing apparatus such as a CD-RW drive that performs recording based on the stored optimum recording laser power value.

[0005] The optical disk recording / reproducing apparatus such as the CD-RW drive described above divides data into a plurality of packets on a track of an overwritable optical disk such as a CD-RW disk by a recording method called a packet write method. . Since the size of the packet is much smaller than that of the track (usually smaller than the size of the buffer for temporarily storing the packet data of the optical disk recording / reproducing apparatus), it is necessary to record thousands of packets on the optical disk. Can be.

When recording data on an optical disc for the first time, the optical disc recording / reproducing apparatus uses an OP for obtaining an optimum recording laser power value of a laser beam during data recording.
A test writing called C is executed, and data is recorded with the optimum recording laser power value obtained thereby. Further, the optimum recording laser power value is stored in a non-volatile memory, and the OPC is not executed every time data is recorded on the optical disk, but the stored optimum recording laser power value is used.

This is because the OPC process takes a long time,
This is because data can be recorded without performing OPC every time data is recorded, and the data recording time is shortened. Also, in an optical disc such as a CD-RW disc, a CD
-10 areas in the area where OPC is performed in the same way
This is because an area for zero times is provided, and the number of times of performing OPC is limited, so that the number of times of OPC processing is reduced.

[0008]

However, in the above-described optical disk recording / reproducing apparatus such as a CD-RW drive, the temperature in the apparatus at the time of data recording, the surface temperature of the optical disk, etc. increase, and the apparatus environment at the time of OPC is increased. If the recording power is different from the above, there is a problem that the recording quality of data is degraded with the optimum recording laser power value stored in the nonvolatile memory, and that reproduction becomes impossible after recording.

The present invention has been made in view of the above points, and has as its object to improve the recording quality of data on an optical disk by effectively utilizing an OPC area.

[0010]

In order to achieve the above object, the present invention provides a laser power calibration means for performing laser power calibration on an optical disk capable of overwriting data, and a laser power calibration means using the same. Optimum recording laser power value storage means for storing the optimum recording laser power value obtained by the operation, packet data storage means for storing data consisting of a plurality of packets to be recorded on the track of the optical disk, and packet data stored in the means. Packet data recording means for recording packet data based on the optimum recording laser power value stored in the optimum recording laser power value storage means; and packet data reproducing means for reproducing packet data recorded by the means. Optical disc recording and playback equipment Reproduces data in the packet region immediately after recording the data of the packet to the track,
When an error is detected by the reproduction, a laser power calibration is performed on the optical disc,
Overwriting means for overwriting packet data stored in the packet data storage means in the packet area based on the optimum recording laser power value obtained by the laser power calibration is provided.

Further, the overwriting means may be provided with means for performing overwriting of the packet data stored in the packet data storage means on the packet area only for packets recorded by the fixed length packet write method. .

Further, it is more preferable to provide a means for prohibiting a subsequent data recording operation on the optical disk when an error is detected in reproducing the data of the packet overwritten on the packet area.

According to a first aspect of the present invention, an optical disk recording / reproducing apparatus performs laser power calibration on an optical disk on which data can be overwritten, and stores an optimum recording laser power value obtained by the laser power calibration. The data of a plurality of packets to be recorded on the track is stored, the data of the stored packet is recorded based on the optimum recording laser power value, and immediately after the data of the packet is recorded on the track, When the data is reproduced and an error is detected by the reproduction, a laser power calibration is performed on the optical disc, and the stored data is stored based on the optimum recording laser power value obtained by the laser power calibration. Overwrite packet data in the packet area In, because the only re OPC when a reproduction error has occurred, without executing the OPC every data recording, can always be correctly reproducibly to record data by performing the OPC only when necessary.

In the optical disk recording / reproducing apparatus according to a second aspect of the present invention, when the data of the stored packet is overwritten in the packet area, the data is written only in the packet recorded by the fixed length packet write method. When an error is detected in the reproduction after recording the data of the packet larger than the buffer size for storing the data, the data of all the packets can be recorded by the subsequent overwriting process.

Further, the optical disk recording / reproducing apparatus according to a third aspect of the present invention prohibits a subsequent data recording operation on the optical disk when detecting an error in reproducing the data of the packet overwritten on the packet area. Therefore, when the packet data cannot be correctly recorded due to the deterioration of the laser or the like, it is possible to prevent wasteful execution of the OPC and waste of the OPC area.

[0016]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a CD-RW drive which is an embodiment of an optical disk recording / reproducing apparatus according to the present invention. This CD-RW drive is a CD-R which is a data rewritable optical disk.
Motor 2 for rotating W disk 1 at an arbitrary rotation speed
And a rotation control unit 3 for controlling the rotation speed by changing the rotation speed of the motor 2.

A semiconductor laser (laser beam) for recording data on and reproducing data from the recording surface of the CD-RW disc 1
An optical pickup 4 for irradiating L, an actuator control unit 5 for moving the optical pickup 4 in the radial direction of the CD-RW disc 1, and a signal control unit 6 for detecting a signal from the optical pickup 4 are provided.

Further, the CPU and a memory such as a ROM and a RAM in a storage area used when the CPU performs various processes are built in. The CPU controls the entire CD-RW drive. A drive controller 7 is provided for executing reading / writing of the optimum recording laser power value to / from the nonvolatile memory 12, writing of packet data to the tracks of the CD-RW disc 1, and various processes according to the present invention.

Further, a buffer 8 for temporarily storing packet data transferred from the host computer 11 and a laser drive circuit 9 for controlling the irradiation of the optical pickup 4 with the laser light L in accordance with an instruction sent from the drive controller 7. And an interface with the host computer 11 for controlling the CD-RW drive,
An external interface 10 for transmitting and receiving data and commands between the host computer 11 and the drive controller 7; an ID of the CD-RW disc 1;
A non-volatile memory 12 for storing information such as an optimum recording laser power value when recording data on the W disk 1 is provided.

That is, the drive controller 7 and the like perform laser power calibration on an optical disk on which data can be overwritten, and the optimum recording laser obtained by the laser power calibration by the means. Optimum recording laser power value storing means for storing a power value; packet data storing means for storing data consisting of a plurality of packets to be recorded on the track of the optical disc; and packet data stored in the means for storing the packet data in the optimal recording laser. It functions as a packet data recording means for recording based on the optimum recording laser power value stored in the power value storage means and a packet data reproducing means for reproducing data of a packet recorded by the means.

The data in the packet area is reproduced immediately after the data of the packet is recorded on the track, and when an error is detected by the reproduction, a laser power calibration is executed for the optical disk. Based on the optimum recording laser power value obtained by the calibration, it also functions as an overwriting means for overwriting the packet data stored in the packet data storage means in the packet area.

Further, when overwriting the packet data stored in the packet data storage means in the packet area, the packet data is written only in the packet recorded by the fixed length packet write method. When an error is detected in the reproduction of the data, a function of means for prohibiting the subsequent data recording operation on the optical disk is also performed.

FIG. 2 is an explanatory diagram showing the format of the recording area of the CD-RW disc 1. The recording area of the CD-RW disc 1 is, from the inner peripheral side, a power calibration area (Power Calibration Arrangement).
ea: PCA) 20, program memory area (Pro
It is composed of a program memory area (PMA) 21, a lead-in area (Lead-in Area) 22, and a program area (Program Area) 23.

The PCA 20 has 100 test areas and 100 count areas, respectively. When recording data on the CD-RW disc 1 for the first time, the CD-RW drive performs OPC in the relevant area, and An optimum recording laser power value of the obtained laser light is set. In the program area 23, data is recorded in units of tracks 24, and information such as the address and data mode of the tracks 24 is recorded in the PMA 21 and the lead-in area 22.
To record.

The lead-in area 22 includes a session 25
Is the area indicating the beginning of the data, and the table of contents information (Tab
le Of Contents (TOC).
The information of the track included in the session 25 is recorded in the TOC. Session 25 consists of a lead-in area,
One unit including one or more tracks and a lead-out area. The lead-out area 26 is an area indicating the end of the session 25.

FIG. 3 shows a track-at-once (Trac)
FIG. 3 is a diagram showing a format of a track on which data is recorded in a (kat once) system. The track on which data is recorded by the track-at-once method is a pre-gap (P
re Gap) 30, user data section (User Da)
ta) 31, run-out block (Run-out) 3
2, the pre-gap 30 further includes a link block (Link) 33 and a run-in block (Run-i).
n) 34.

The pre-gap 30 is located at the head of the track, and is a silent part in the case of music.
It consists of 25 blocks. The user data section 31 is an area for recording packet data. The run-out block 32 is a block indicating the end of the track, and includes two blocks.

The link block 33 is a block showing a joint between tracks and is composed of one block. The run-in block 34 is a block indicating the head of the track, and includes four blocks.

When the track-at-once method is used,
The user data section 31 must be recorded at a stretch.
This is because if the data recording operation is interrupted, the CD-RW
This is because the continuity of the data on the disc is lost and the data in that portion cannot be reproduced. Therefore, CD-R
The W drive temporarily stores the data of the packet received from the host computer in the buffer, and controls so that the recording operation is not interrupted.

FIG. 4 shows a packet write (Packet
FIG. 3 is a diagram showing a track format in which data is recorded in a (writing) system. The track on which data is recorded by the packet write method includes a pre-gap 40 and a user data section 41.

The user data section 41 includes a plurality of packets 4
Consists of two. Each packet 42 is a group of sectors existing in a track, and the minimum is one sector. The link block 43 includes one link block 43, four run-in blocks 44, a user data unit 45, and two run-out blocks 46.

The link block 43 stores data indicating a joint between tracks. Run-in block 4
4 stores data indicating the head of the track. The user data section 45 records data transferred from the host computer. The run-out block 46 stores data indicating the end of the track.

The CD-RW drive sets the packet 42 to 1
Recording is performed by one write process, and one file is recorded in one packet. In the packet write method, the number of sectors to be recorded at one time is smaller (less than the memory size of the CD-RW drive) as compared with the track-at-once method, so that the buffer underrun (Buffer Under Run) generated due to poor system working efficiency. ) There is an advantage that an error hardly occurs and it can be handled like a floppy disk.

The packet write method includes a fixed-length packet write (Fixed PacketSize) method,
Variable Length Packet Write (Variable Packet)
tSize) method.

The variable length packet write method can set the packet length widely from one sector to several thousands sectors according to the size of the file. On the other hand, in the fixed-length packet write system, the packet length is generally set to a size smaller than the buffer size of the CD-RW drive.

Next, the packet write processing of data in the CD-RW drive will be described. FIG.
It is a flowchart which shows the process. In this process, packet data is received from the host computer 11 in step (indicated by “S” in the figure) 1 and stored in the buffer 8 in accordance with a recording command from the host computer 11, and stored in the nonvolatile memory 12 in step 2. The optimum recording laser power value of the CD-RW disc 1 is read from the OPC table thus obtained, and it is determined in step 3 whether or not the disc has been subjected to OPC before.

If it is determined in step 3 that the disc has been subjected to OPC before, in step 4 the optimum recording laser power value read from the OPC table is set as the recording power. Also, in the judgment of step 3, the OP
If it is determined that the disk is not a disk on which C has been performed, step 1
5, the OPC is executed, and the optimum recording laser power value obtained from the OPC is
The data is stored in the PC table and set to the recording power at the time of packet writing.

Further, at step 5, an address at which data recording on the CD-RW disk 1 is started is calculated. At step 6, data is packet-written to the above-mentioned address with the above-mentioned optimum recording laser power value. It is determined whether or not the packet write processing has been completed, and if a write error has occurred, an error code is set in step 16 and the processing ends.

If it is determined in step 7 that the packet write processing has been normally completed and there is no write error, the PMA is recorded in step 8. The PMA record stores a value indicating an incomplete track (Incomplete Track) in the PMA record.
It is recorded in the subcode (Subcode) of the A area.

It is determined in step 9 whether a PMA write error has occurred. If a write error has occurred, an error code is set in step 16 and the process ends. If the recording of the PMA is completed normally and there is no write error, a reproduction process of the packet recording area immediately after the packet write is executed in step 10, and it is determined in step 11 whether or not there is a reproduction error. By this reproduction, it is determined whether or not the packet data is normally recorded.

If it is determined in step 11 that the reproduction has been normally performed and there is no reproduction error, the process is terminated. If a reproduction error has occurred, it is determined in step 12 whether or not the error content is a disk error. If the error is not a disk error such as a mechanical error or a hardware error, the process proceeds to step 16. Set the error code,
This processing ends.

If it is determined in step 12 that a disk error has occurred, in step 13 the OPC is executed and the inserted C
The optimum recording laser power value of the D-RW disc 1 in the current apparatus environment is obtained, and in step 14, the packet data stored in the buffer 8 is overwritten on the packet with the obtained optimum recording laser power value. finish.

In this way, when the packet-written data can be normally reproduced, the OPC need not be performed, and the OPC processing time and the OPC area can be saved. Then, depending on the environmental temperature at the time of data recording, the CD-
If the temperature of the recording surface of the RW disc 1 or the internal temperature of the CD-RW drive rises and the optimum recording laser power value read from the OPC table does not conform to the optimum value, O
Since the PC is executed to find a suitable optimum recording laser power value again and then re-record, the data recording quality can be improved.

Next, as described above, there are two types of the packet write system, the fixed special packet write system and the variable length packet write system. In the packet area recorded by the variable length packet write system in the above-described processing, When packet data larger than the size of the buffer 8 is recorded, even if an error is detected during reproduction immediately after data recording, it is impossible to overwrite all the packet data to be originally recorded.

For example, if the size of the buffer 8 is 100 KB
And when the size of the packet data is 120 KB,
When the last 20 KB is stored in the buffer 8, 20 KB of the previously stored 100 KB is overwritten.

Therefore, when overwriting the packet data stored in the buffer 8 into the packet area,
It is preferable to limit the processing to only the packet area recorded by the fixed length packet write method.

Next, a description will be given of a process for overwriting packet data only in a packet area recorded by the fixed length packet write method. FIG. 6 is a flowchart showing the processing. In this process, in Step 21, a fixed variable, which is a program variable, is set to “0” to initialize the variable, and in Step 22, the setting from the host computer 11 is a fixed-length packet write method
It is determined whether the setting is “t Writing” or not, and if the setting is not the fixed-length packet write method, the process ends in preparation for the next packet write.

If it is determined in step 22 that the fixed-length packet write system is to be set, the variable Fixed flag is set to 1 and the packet size is set in step 24 to prepare for the packet write process.

In this way, the CD-RW drive overwrites the packet data only in the packet area recorded by the fixed-length packet write method, so that erroneous data can be prevented from being recorded by the overwriting.

Next, when the reproduction after overwriting results in an error due to the deterioration of the laser of the optical pickup 4 or the like in the above-mentioned processing, even if the optimum recording laser power value is obtained by executing the OPC, the reproduction error again occurs. There is a risk of becoming. In such a case, the OPC area is wasted. Therefore, when an error is detected in the reproduction process after overwriting, it is preferable to prohibit the subsequent data recording operation on the CD-RW disc.

Next, a description will be given of a process for prohibiting a subsequent data recording operation on a CD-RW disc when an error is detected in the reproduction process after overwriting. FIG. 7 is a flowchart showing the processing. In this process, an overwrite process is executed in step 31 and it is determined in step 32 whether a write error has occurred in the overwrite process. If a write error has occurred, an error code is set in step 37 and The process ends.

If a write error does not occur in the determination of step 32, a reproduction process of the overwritten packet area is executed in step 33, and it is determined in step 34 whether or not a reproduction error has occurred. If it is not a reproduction error, it is determined that there is no problem in the recording quality, and this processing is terminated. If it is a reproduction error, in step 35, the reproduction error depends on the disc such as an EDC error that cannot be corrected due to a large number of data errors. It is determined whether or not.

If it is determined in step 35 that the disc is not a disc error, an error code is set in step 37 and this processing is terminated.
-It is determined that there is an abnormality in the laser system of the RW drive, the write inhibit flag = 1 is set, an error code is set in step 37, and this processing ends.

As described above, when a reproduction error occurs due to deterioration of the laser system of the optical pickup 4 or the like,
Since the data recording operation on the CD-RW disk 1 is prohibited, it is possible to prevent the OPC area from being wasted.

[0055]

As described above, according to the optical disk recording / reproducing apparatus of the present invention, the recording quality of data on the optical disk can be improved by effectively utilizing the OPC area.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a CD-RW drive which is an embodiment of an optical disk recording / reproducing apparatus of the present invention.

FIG. 2 is an explanatory diagram showing a format of a recording area of a CD-RW disc 1.

[Fig. 3] Track at once
FIG. 3 is a diagram illustrating a format of a track on which data is recorded in the (nc) method.

FIG. 4 is a packet writer.
FIG. 6 is a diagram showing a track format in which data is recorded in the g) method.

FIG. 5 is a flowchart showing a packet write process of data in the CD-RW drive.

FIG. 6 is a flowchart showing a process in which overwriting of packet data in the CD-RW drive is performed only in a packet area recorded by a fixed-length packet write method.

FIG. 7 is a flowchart showing a process of prohibiting a subsequent data recording operation on a CD-RW disc when an error is detected in the reproduction process after overwriting of the CD-RW drive.

[Explanation of symbols]

 1: CD-RW disc 2: Motor 3: Rotation control unit 4: Optical pickup 5: Actuator control unit 6: Signal control unit 7: Drive controller 8: Buffer 9: Laser drive circuit 10: External interface 11: Host computer 12: Non-volatile memory 20: PCA 21: PMA 22: Lead-in area 23: Program area 24: Track 25: Session 26: Lead-out area 30, 40: Pre-gap 31, 41, 45: User data section 32, 46: Run-out block 33, 43: Link block 34, 44: Run-in block 42: Packet

Claims (3)

[Claims] 1. A laser power calibration means for executing a laser power calibration on an optical disk on which data can be overwritten, and an optimum recording for storing an optimum recording laser power value obtained by the laser power calibration by the means. Laser power value storage means, packet data storage means for storing data consisting of a plurality of packets to be recorded on tracks of the optical disc, and packet data stored in the means stored in the optimum recording laser power value storage means. An optical disc recording / reproducing apparatus comprising: packet data recording means for recording based on the optimum recording laser power value; and packet data reproducing means for reproducing packet data recorded by the means. Immediately after recording When the data in the packet area is reproduced and an error is detected by the reproduction, a laser power calibration is performed on the optical disc, and the packet data is reproduced based on the optimum recording laser power value obtained by the laser power calibration. An optical disc recording / reproducing apparatus, comprising overwriting means for overwriting packet data stored in a storage means on the packet area. 2. The optical disk recording / reproducing apparatus according to claim 1, wherein when the packet data stored in the packet data storage is overwritten in the packet area, the overwriting means is recorded by a fixed length packet write method. An optical disk recording / reproducing apparatus characterized in that a means for performing only for a given packet is provided. 3. The optical disk recording / reproducing apparatus according to claim 1, wherein when an error is detected in reproducing data of the packet overwritten on the packet area, a subsequent data recording operation on the optical disk is prohibited. An optical disk recording / reproducing apparatus characterized by comprising means.