JP2002203362A - Optical disk unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an optical disk unit which can read written data continuous ly and normally during reproduction as if a single write processing has been performed even if write processing is resumed from a write interruption position after temporarily interrupting the write processing. SOLUTION: At the time of pause write PW, a write control section 34 stores into a built-in register the time information at the point in time concerned, and information about up to how many EFM frames write has been performed while taking the sub-code sync as reference, writes data up to the end of the EFM frame, and interrupts write processing. During restart write ReW, the write control section 34 waits for the sub-code sync when the time at which writing is interrupted is reached according to the time information of ATIP, or the time information of the sub-code. On detection of the sub-code sync, the write control section 34 starts write again from the position after counting frame sync for EFM frame numbers stored into the register at the write interruption.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CD-R / RW,
The present invention relates to an optical disk device that records and reproduces information on a data writable optical disk such as a DVD-R / RW and a DVD + RW.

[0002]

2. Description of the Related Art CD-R / RW, DVD-R / RW, D
It is necessary to complete data recording on a data-writable optical disk such as VD + RW by one writing operation.
The writing method is Track at Once (Track at Once).
Once), and Disc at Once. During this one writing operation, the writing speed to the optical disk is faster than the data transfer speed from the host computer, and if the data to be written to the optical disk is interrupted, that is, if a buffer underrun occurs, the data is written to the optical disk. Data writing will fail.

The buffer underrun is more likely to occur as data is written at a higher speed, and if the buffer underrun occurs, it is fatal to a non-rewritable medium such as a CD-R. Conventionally, as a method of avoiding a buffer underrun, a buffer RAM (for example,
In other words, a method of increasing the capacity of a DRAM (comprising a DRAM) or reducing the speed of writing data to an optical disk slower than the speed of transferring data from a host computer has been adopted.

In Japanese Patent Application Laid-Open No. 10-49990, it is not a method of avoiding a buffer underrun, but rather, when a buffer underrun occurs, temporarily suspends data writing to an optical disc and transfers a sufficient amount of data transferred from a host computer. A technique is disclosed in which writing is resumed from the position of the interrupted optical disk after the data is accumulated in the buffer RAM, and even when a fatal buffer underrun occurs in the data writing process on the optical disk, The data writing operation can be normally terminated without failing in writing.

[0005]

SUMMARY OF THE INVENTION Such Japanese Patent Application Laid-open No. Hei 10
In the recording control disclosed in Japanese Patent No. 49990, there is a possibility that the data recording operation on the optical disk is frequently stopped and restarted. Normally, data transferred from the host computer is temporarily transferred to and held in the buffer RAM,
A predetermined parity or the like is encoded and added. Thereafter, the data is subjected to processing such as CIRC and EFM modulation, and is recorded on the optical disc as recording data. At present, in a general optical disk device, the buffer R
AM has a capacity of about 512 Kbytes to 8 Mbytes.

On the other hand, for example, the recording speed of a CD is 150 Kbytes / sec at a standard speed, and if the recording speed is increased as in the present case, it is 2.4 Mb at 16 × speed.
yte / sec, and the time required to record all the data once held in the buffer RAM is extremely limited. In other words, if no new data transfer is performed from the host computer during this time, a buffer underrun occurs, and the recording operation is temporarily stopped. Although the performance of the host computer connected to the optical disk device has been improved, the recording operation must be frequently paused and resumed in order to guarantee that all the host computers operate stably. Must be dealt with.

However, in a situation where the recording operation is frequently stopped and restarted, if the end of the previous recording position is detected and the control for accurately restarting the recording from the end position is performed, If there is a deviation between the absolute position information on the optical disc and the position of the recorded data, the deviation is accumulated, and if the deviation exceeds a certain value, recording cannot be resumed. That is, as described above, the amount of data that can hold one data transfer from the host computer is at most the capacity of the buffer RAM,
If the data transfer from the host computer is not performed again until the recording of the data stored in the buffer RAM is completed, the recording operation must be temporarily stopped. The above problem becomes more probable as the buffer RAM capacity becomes smaller and as the recording speed on the optical disk increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem. Even if the writing process is temporarily interrupted during the writing process, and the writing process is performed again from the interrupted position, the playback process is not performed. It is an object of the present invention to provide an optical disk device capable of continuously and normally reading data that has been written in the same manner as a single write operation.

[0009]

An optical disk apparatus according to the present invention performs recording and reproduction of information on and from a data writable optical disk in which address information indicating the position of a data unrecorded portion is formed in advance. A data storage unit for temporarily storing data for writing to the optical disk transferred from the outside for performing predetermined data processing, and performing a predetermined data processing on the data stored in the data storage unit. A data processing unit to perform;
An encoder for modulating the write data processed by the data processing unit in a predetermined manner and outputting the modulated data; and controlling the operation of the data processing unit and the encoder and controlling the storage of the write data in the data storage unit. The write control unit performs data write control to the optical disk, and detects occurrence of a state in which supply of write data to the data storage unit is interrupted, and issues an operation command to the write control unit according to the detection result. A write operation command unit,
When suspending the writing of data to the optical disc, the writing control unit, for the data processing unit and the encoder unit,
After the access to the data storage unit is completed, a standby state is set to stop the access to the data storage unit and stop the storage of the write data in the data storage unit.

Further, the write control unit may detect an abnormality of various information read from the optical disk at the time of data writing, and interrupt the data writing process to the optical disk when the abnormality is detected.

[0011] In this case, the write operation command unit, when the write control unit detects that the various types of information read from the optical disk have become normal after detecting the abnormality and interrupting the data write process, The writing control unit restarts data writing from the writing end position when the data writing process is interrupted.

An end position information storage unit for storing information indicating a data write end position on the optical disk;
When ending the data writing to the optical disk, the write control unit may store the position information on the optical disk at the time of the end in the end position information storage unit.

More specifically, the write control unit detects the write end position stored in the end position information storage unit from position information obtained from data recorded on the optical disk.

Further, the write control unit may detect the write end position stored in the end position information storage unit from the absolute position information indicating the absolute position of the data unrecorded portion formed in advance on the optical disc. Good.

Further, the write control unit corrects a delay time generated when reading and demodulating position information obtained from the optical disk by using a preset correction value.

More specifically, the write operation command unit controls the optical pickup for reading and writing data from / to the optical disk from the end position information stored in the end position information storage unit by a predetermined value before the end position. After the seek, the write control unit detects the write end position stored in the end position information storage unit.

When writing data from the write end position, the write control unit includes an optical pickup for reading and writing data from / to the optical disk based on the end position information stored in the end position information storage unit. After the seek operation is performed a predetermined value before the end position, the write end position stored in the end position information storage unit may be detected.

When writing data from the write end position, if the data writing from the write end position is not started, the write control unit interrupts the rewrite operation to the optical disk, and then again From the end position information stored in the end position information storage unit, after causing the optical pickup to seek a predetermined value before the end position,
The write end position stored in the end position information storage unit is detected.

On the other hand, the write control section sets the write data at the write end position and the write start data at the time of rewriting to a space indicating data that is inconsistent with the data when pits are formed on the optical disk. You may.

Specifically, the encoder unit converts the write data processed by the data processing unit into an EFM by a predetermined method.
The output is modulated, and the write control unit sets the write end position as the space of the EFM frame sync and starts the write start position from the space of the EFM frame sync.

Further, in order to perform the CAV control, a write reference clock signal used for obtaining data write timing when data is recorded on an optical disk is defined as follows.
P which is generated so as to be PLL-locked to the wobble signal read from the optical disk in accordance with the rotation speed of the optical disk
A clock signal generation unit including an LL circuit is provided.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail based on an embodiment shown in the drawings. First embodiment. FIG. 1 is a block diagram showing a schematic configuration example of an optical disk device according to a first embodiment of the present invention, and FIG. 1 shows a CD-R as an example. In the following description, a sync pattern is abbreviated as a sync. In the optical disk device 1 of FIG. 1, an optical pickup 3 for reading and writing data from and on an optical disk 2 includes a semiconductor laser, an optical system, a focus actuator, a track actuator, a light receiving element,
And a built-in position sensor (not shown)
The optical disk 2 is irradiated with laser light to read and write data.

The data signal read by the optical pickup 3 is amplified by the read amplifier 4 and binarized.
The CD decoder 5 performs EFM demodulation and CIRC operation (deinterleaving, error correction, etc.) on the binary data amplified by the read amplifier 4 and decodes the decoded data. In the case of CD data, the data is D / A converted by the D / A converter 6 and output as an audio signal.

The CD decoder 5 decodes the decoded C
D data and data for a personal computer (hereinafter referred to as CD-ROM data) are output to the CD-ROM decoder 7. C
The D-ROM decoder 7 stores the input data in the buffer RAM 9 via the buffer manager 8 as needed, and performs an error correction process on the stored data to further improve the reliability of the data. Even in such a case, the reading of the data stored in the buffer RAM 9 and the transfer of the data to and from the buffer RAM 9 by writing back the data by error correction are performed through the buffer manager 8.

The data for which the error correction processing has been completed by the CD-ROM decoder 7 is read out via the buffer manager 8 and transferred to the external host computer HC via the host interface 10. The host interface 10 performs an interface with the host computer HC, and conforms to, for example, ATAPI or SCSI standards.

On the other hand, the unrecorded optical disk 2 has ATIP data embedded therein during the manufacturing process.
When writing data to the unrecorded portion of the ATIP, the optical pickup 3 reads the ATIP data. That is, a wobble signal on the optical disk 2 is read by the optical pickup 3, amplified by the read amplifier 4, binarized, and output to the ATIP decoder 11.

The ATIP decoder 11 receives the input AT
A synchronization signal (hereinafter, referred to as an ATIP sink), time information (hereinafter, referred to as ATIP time information), and a CRC operation result of the ATIP data (hereinafter, referred to as an ACRC result) are generated from the IP data, and output to the CD encoder 12. . C
When writing data to an unrecorded portion of the optical disc 2, the D encoder 12 inputs A as important information for detecting a write position on the optical disc 2.
Uses TIP data. The CD encoder 12 uses the AT
Optical disc 2 based on IP sink and ATIP time information
In this case, writing from an accurate position can be performed.

As described above, in the unrecorded portion of the optical disk 2, time information indicating the position on the optical disk can be obtained only from the ATIP data. On the other hand, in the data recorded portion of the optical disc 2, the quality of the wobble signal is poor, and the ATIP decoder 11 may not be able to generate accurate ATIP sync and ATIP time information.
However, subcode data is recorded in the recorded portion of the optical disc 2 together with a subcode sync that forms a synchronization signal, and the CD decoder 5 processes the subcode data to convert time information on the optical disc 2 into a CD encoder. 1
Output to 2. As described above, when writing data to a recorded portion of the optical disc 2, the CD encoder 12
Time information indicating the position of the optical disk is obtained using the subcode data.

Data to be written on the optical disk 2 is transferred from the host computer HC to the buffer RAM 9 via the buffer manager 8. The CD-ROM encoder 13 controls the buffer R via the buffer manager 8.
Read AM9 data, error correction code, EDC
A code, a SYNC code, header information, and the like are added and written back to the buffer RAM 9.

The CD-ROM encoder 13 reads the prepared data from the buffer RAM 9 via the buffer manager 8 and writes the data to a CIRC operation RAM (described later) in the CD encoder 12. The CD encoder 12 converts the data in the CIRC calculation RAM
C operation is performed, an error correction code is added and interleaving is performed, and the data after the operation is further EFM-modulated and output. The data output from the CD encoder 12 passes through the laser control circuit 14 and the optical pickup 3
It is recorded on the optical disc 2.

A wobble signal obtained from the optical disk 2 is input to the servo circuit 15 via the optical pickup 3 and the read amplifier 4, and a rotation control signal generated by the servo circuit 15 is supplied to the spindle motor via the motor driver 16. 17 is supplied. The CD decoder 5, C
D-ROM decoder 7, host interface 10, A
TIP decoder 11, CD encoder 12, and CD-R
The operation of the OM encoder 13 and the like is controlled by the CPU 20.

FIG. 2 shows a format of a CD-R / RW data write unit specified in the Orange Book. Normally, data cannot be completely read out only by writing data in a user data block (User Data Block) due to deinterleaving and synchronization pull-in during reproduction of data recorded on the optical disc 2. Therefore, by providing five redundant blocks before the user data block and two redundant blocks after the user data block, the user data block is protected and data can be read reliably.

The five blocks before the user data block include a link block (Link Block) LB and first to fourth run-in blocks (Run-in Blocks) RIB1 to RIB4, and two blocks after the user data block. Is
It comprises a first run-out block ROB1 and a second run-out block ROB2.

FIG. 3 is a diagram showing an example of a format when writing the data shown in FIG. 2 in a plurality of times. In FIG. 3, when data is received, data from the host computer HC is received, and when the data is filled in the buffer RAM 9, the CD encoder 1
2 executes Start Write StartW.

Further, the CD encoder 12 starts writing data to the optical disk 2, and when the data in the buffer RAM 9 becomes low and a buffer underrun is about to occur, the CD encoder 12 executes Pause Write PW to execute the pause write PW. 2 temporarily stops writing data. Thereafter, the CD encoder 12 waits for data transfer from the host computer HC, and again
When the data is full, the restart light (Restart Writ
e) ReW is executed, a position where data writing is temporarily stopped by the pause light PW is detected, and data writing is started continuously from that position.

As described above, when the amount of data in the buffer RAM 9 decreases, the CD encoder 12 sets the pause write PW
Pauses data writing with buffer RAM again
When the data is filled in 9, the process of restarting the data writing by the restart write ReW is repeated as appropriate. All the write data from the host computer HC is transferred to the optical disk 2
, The CD encoder 12 finally executes a stop write (Stop Write) StopW to complete the write processing. By such data processing, data can be written as if the write processing was performed once, similarly to the format shown in FIG.

Here, the flow of operations in the write control operation of each section shown in FIG. 1 will be described. First, the CPU 20 issues a start write (StartW) command, and the CD encoder 12 starts a write operation on the optical disc 2. Next, the buffer manager 8
Receives the data transferred from the host computer HC, and stores the data in the buffer RAM 9;
The PU 20 checks by a predetermined method whether or not the data transferred from the host computer HC and stored in the buffer RAM 9 has decreased to a predetermined amount.

If the data stored in the buffer RAM 9 has not decreased to the predetermined amount, the CPU 20 determines whether or not the data writing to the optical disk 2 has been completed according to predetermined firmware. Then, a stop light (StopW) command is issued to the CPU 12, and the writing process ends. If the data writing to the optical disc 2 has not been completed, the CD encoder 12 continues the writing operation to the optical disc 2.

On the other hand, when the CPU 20 determines that the data stored in the buffer RAM 9 has decreased to a predetermined amount,
A pause write (PW) command is issued to the D encoder 12 to interrupt the writing process on the optical disc 2.
Next, the buffer manager 8 executes the host computer H
Upon receiving the data transferred from C, the data is stored in the buffer RAM 9 and the CPU 20 checks by a predetermined method whether or not the data transferred from the host computer HC and stored in the buffer RAM 9 has reached a predetermined amount. .

When the CPU 20 determines that a predetermined amount of data has been stored in the buffer RAM 9, the CD encoder 1
The buffer manager 8 issues a restart write (ReW) command to the CPU 2 to restart the writing process on the optical disk 2, and the buffer manager 8 receives the data transferred from the host computer HC and stores the data in the buffer RAM 9. When the CPU 20 determines that a predetermined amount of data is not stored in the buffer RAM 9, the buffer manager 8 continuously receives the data transferred from the host computer HC and stores the data in the buffer RAM 9.

As described above, when receiving a write command and a certain amount of data from the host computer HC, the CPU 20 issues a start write (StartW) command to start data writing. The start write (StartW) command is a normal write sequence starting from a link block, and repeats a predetermined length of writing to the optical disk 2 and receiving data from the host computer HC. During the writing process, the host computer HC
If the data transfer rate from the buffer RAM 9 is low, the data in the buffer RAM 9 decreases, and the writing process cannot be continued.

From this, the CPU 20 sets the buffer R
If it is detected that the data amount in the AM 9 has decreased and the data transfer from the host computer HC cannot be completed in time, a pause write (PW) command is issued to interrupt the write process. Note that when the write process is interrupted by the pause write (PW) command, this is a write sequence in which the write process is temporarily interrupted without writing the run-out block.

Thereafter, when the CPU 20 has sufficiently received the data from the host computer HC and stored it in the buffer RAM 9, it issues a restart write (ReW) command. When performing a write process by a restart write (ReW) command, data is not written in a link block as in a normal write sequence, and continuity is maintained from the continuation of the data at the time when the write process was interrupted, and This is a write sequence in which the write processing is accurately performed from the end of the write data when the write processing is interrupted so that the synchronization is not lost due to the write alignment. When predetermined data is written to the optical disk 2, the CPU 20
Issues a stoplight (StopW) command. Note that when the write processing is terminated by a stop write (StopW) command, it is a normal write sequence for writing a run-out block.

As described above, the optical disc apparatus 1 monitors the data amount of the buffer RAM 9 during the write sequence, and repeats the pause write PW and the restart ReW at any time to prevent a write failure due to a buffer underrun. In this way, if data transfer from the host computer HC cannot be made in time during data writing to the optical disc 2, the writing process is temporarily suspended and the data is sufficiently transmitted from the host computer HC. Resume data writing. Therefore, even if the data transfer from the host computer HC is temporarily interrupted or the transfer rate is lowered, the data can be normally written to the optical disc 2 in a plurality of times, thereby preventing the data writing from failing. Can be. Further, the capacity of the buffer RAM 9 for absorbing the pulsation of the data transfer can be reduced, and the cost of the optical disc device 1 can be reduced.

Next, FIG. 4 is a schematic block diagram showing an example of the configuration of the CD encoder 12, and FIG.
The data write operation of the encoder 12 on the optical disk 2 will be described in more detail. In FIG.
The encoder 12 includes a clock signal generation unit 30 including a clock generator constituted by a PLL circuit and the like,
An RC calculation RAM unit 31, a CIRC calculation unit 32,
An FM encoder 33 and a write controller 34 are provided.

The clock signal generation section 30 receives, for example, 33.8688 MH from a crystal oscillator (not shown).
A channel clock signal, which is a reference clock signal for writing necessary in the CD encoder 12, is generated from the clock signal of z and output to each unit in the CD encoder 12. C
The IRC calculation RAM unit 31 temporarily stores the write data read from the buffer RAM 9 by the CD-ROM encoder 13 in order to perform a CIRC calculation or the like.

The CIRC calculation unit 32 performs a CIRC calculation on the data stored in the CIRC calculation RAM unit 31, and further adds and interleaves an error correction code.
The data processed in step (1) is EFM-modulated by a predetermined method and output to the laser control circuit 14. Further, the write control unit 34 responds to a command from the CPU 20 to
IRC operation unit 32, EFM encoder unit 33 and CD-
The ROM encoder 13 generates and outputs control signals for performing write control to a CD interface unit 35 that interfaces with the CD encoder 12.

More specifically, the write control unit 34
When a start light (StartW) command is input from U20, a predetermined write signal W is generated, and when a pause light (PW) command is input from CPU 20, a predetermined pause signal P is generated, and CIRC operation unit 32, EFM The signals are output to the encoder 33 and the CD interface 35, respectively. The write control unit 34 generates a predetermined pause release signal PX when a restart light (ReW) command is input from the CPU 20, and generates a predetermined stop signal S when a stop light (StopW) command is input from the CPU 20. Is generated and output to the CIRC operation unit 32, the EFM encoder unit 33, and the CD interface unit 35, respectively. In FIG. 4, A indicates address data, D indicates
Indicates data, Req indicates a request signal, and Ack indicates an acknowledge signal.

In such a configuration, when a pause light (PW) command is output from the CPU 20, the write control unit 34 sets in advance the CIRC calculation unit 32, the EFM encoder unit 33, and the CD interface unit 35. The writing process is continued until the writing end EFM frame, and after the writing process is performed until the end of the EFM frame, the writing process is interrupted. Also, the CI that accesses the RAM unit 31 for CIRC calculation is
At the end of the EFM frame, the RC operation unit 32, the EFM encoder unit 33, and the CD interface unit 35 have completed the necessary calculation and readout processing within the EFM frame, and thus enter a standby state.

In the standby state, the CIRC operation unit 32
The operation of generating the address data, the data, the request signal, and the acknowledge signal between the FM encoder unit 33 and the CD interface unit 35 and the CIRC operation RAM unit 31 is stopped. Also, the EFM encoder unit 33
Stops outputting write signals such as the EFM signal and the write gate signal WGATE. As described above, since the output of the write gate signal WGATE is stopped, the data writing to the optical disk 2 is also interrupted.

Here, the reason why the data writing to the optical disc 2 fails when the buffer underrun occurs is that the same state at the time of rewriting is maintained because the CIRC operation unit 32 for generating the writing data is interleaved. This is due to the fact that it cannot be made and that the calculation of the DSV (Digital Sum Value) performed by the EFM encoder unit 33 is disturbed during the rewriting operation. Upon receiving a write interruption command from the CPU 20, the CD-ROM encoder 13 accesses the CIRC calculation RAM unit 31 to generate write data, the CIRC calculation unit 32,
The interleaving can be managed by controlling each unit of the EFM encoder unit 33 to be in a standby state after completion of the access at the present time and to restart the operation at the start of the rewriting. At the same time, the EFM encoder unit 33 is also set in the standby state, so that the disturbance of the DSV calculation can be avoided.

When a restart write (ReW) command is output from the CPU 20 in the interrupted state, the write control unit 34 detects the rewrite position as described later, and then enters the standby state by the pause signal P. The pause release signal PX is output to the CIRC operation unit 32, the EFM encoder unit 33, and the CD interface unit 35, which have been changed. In this way, the CIRC operation unit 32, the EFM encoder unit 33, and the CD interface unit 35 perform the subsequent processing from the standby state, and send the EFM signal and the write gate signal WGATE from the EFM encoder unit 33.
Is restarted. By restarting the output of the write gate signal WGATE, data writing to the optical disk 2 is also restarted from the continuation of the standby state.

In this manner, the writing operation for maintaining the continuity of the writing data is performed at the write end position and the rewrite start position of the data on the optical disk 2. Therefore, at the time of the write operation, the write operation is suspended and the rewrite operation is performed. Even in this case, the data can be accurately and continuously read later.

FIG. 5 is a flowchart showing an example of a write control operation in the optical disk device shown in FIGS. In FIG. 5, the CPU 20 issues a start write (StartW) command to the write control unit 34 (step ST1), and the write control unit 34 outputs a predetermined write signal W to the CIRC operation unit 32, the EFM encoder unit 33, The data is output to the CD interface unit 35 to start the writing operation to the optical disk 2 (step ST2). Next, the buffer manager 8
Upon receiving the data transferred from the host computer HC, the data is stored in the buffer RAM 9 (step ST3), and the CPU 20 determines that the amount of data transferred from the host computer HC and stored in the buffer RAM 9 has become small, that is, It is checked by a predetermined method whether or not the quantity has been reduced (step ST4).

If it has not been reduced to the predetermined amount in step ST4 (NO), CPU 20 determines whether or not data writing to optical disk 2 has been completed according to predetermined firmware (step ST5). If the data writing is completed in step ST5 (YES), the CPU 2
0 is a stop light (S
topW) command (step ST6), and the write control unit 34 outputs a predetermined stop signal S to the CIRC operation unit 32, the EFM encoder unit 33, and the CD interface unit 35, respectively, to execute a write operation on the optical disk 2. This is ended (step ST7), and this flow ends. If it is determined in step ST5 that the processing has not been completed (N
O), returning to step ST2.

On the other hand, if it is determined in step ST4 that the amount has been reduced to the predetermined amount (YES), the CPU 20 issues a pause write (PW) command to the write control unit 34 (step ST8), and the write control unit 34 Outputs the predetermined pause signal P to the CIRC operation unit 32, the EFM encoder unit 33, and the CD interface unit 35, and interrupts the writing process on the optical disc 2 (step ST9). Next, the buffer manager 8 receives the data transferred from the host computer HC,
The data is stored in the buffer RAM 9 (step ST
10) The CPU 20 checks by a predetermined method whether the data transferred from the host computer HC and stored in the buffer RAM 9 is full, that is, whether or not the data has reached a predetermined amount (step ST11).

If it is determined in step ST11 that a predetermined amount of data has been stored (YES), the CPU 20 issues a restart write (ReW) to the write control unit 34.
A command is issued (step ST12). The write control unit 34 outputs a predetermined pause release signal PX to the CIRC calculation unit 3
2. Output to the EFM encoder unit 33 and the CD interface unit 35, respectively, to restart the writing process on the optical disc 2 (step ST13),
Return to If it is determined in step ST11 that a predetermined amount of data is not stored (NO), the process proceeds to step S11.
Returning to T10, the writing process is continued.

Next, detection of a rewrite position will be described. FIG. 6 is a diagram showing the positional relationship between the end of writing data and the start of writing of data on the optical disc 2 stipulated in the Orange Book. As shown in FIG. 6, in the Orange Book, a considerably large data overlap of 4 EFM frames is allowed. If such a large amount of data overlaps, frame synchronization is lost even in an optical disk device such as a CD having a high correction capability, and normal reproduction cannot be performed. The reason for having such a large allowable value is to absorb the rotation control error of the spindle motor, and the next write start position is determined by the ATIP demodulated from the wobble signal regardless of the already written data. This is because it is determined by the sink.

In order to reproduce the data without losing the synchronization at the connection portion of the data recording, the format shown in FIG. 7 is obtained in consideration of the frame synchronization protection window width. That is, in order to perform writing so that reproduction can be performed without losing synchronization, it is necessary to form a connection portion for data recording with a deviation of about ± 2 bit clocks. It is difficult to determine such an accurate data write position by a write control based on the rotation control accuracy of a spindle motor as in a conventional optical disk device.

Therefore, in the optical disk device 1 according to the first embodiment, the writing control unit 34
Outputs a pause light (PW) command from the sub-code sync (S0 or S0)
Information on how many EFM frames have been written based on 1) is stored in a built-in register (not shown).
Write data until the end of the FM frame,
Interrupt the writing process. In a rewrite process in which a restart write (ReW) command is output from the CPU 20, the CPU 20 reads the position on the optical disk 2 where data writing has been interrupted from the register of the write control unit 34, checks the position, and checks the position before the position. Seek.

After the seek operation is performed by the CPU 20, the write control unit 34 waits for the subcode sync (S0 or S1) when the write control unit 34 proceeds from the ATIP time information or the subcode time information to the time at which the writing was interrupted. When a subcode sync is detected, the number of EFM frames stored in the register when writing is interrupted is waited for a frame sync. When the writing is interrupted, the writing control unit 34 always waits for the demodulation delay time of the frame sync from the time when the frame sync has been written. Can connect data accurately.

FIG. 8 is a diagram showing the relationship between the subcode sync and the frame sync on the optical disk 2 and the subcode sync and the frame sync after demodulation. The subcode sync and the frame sync shown in FIG. 8 are signals obtained even when an inexpensive general-purpose LSI dedicated to the CD decoding function is used. As can be seen from FIG.
When demodulating the subcode sync and the frame sync, an inherent demodulation delay occurs. When rewriting is performed, it is necessary to correct the demodulation delay in order to accurately connect data on the optical disc 2. By allowing the write control unit 34 to set the correction amount arbitrarily, it is possible to correct the demodulation delay regardless of the difference between the optical pickup, the decoder, and the like, so that accurate rewriting can be performed.

On the other hand, when data is written to the optical disk, the data is not actually written in order to confirm whether the writing can be completed normally. Test light). Also in this case, the test write does not write data to the optical disk 2 when performing the interruption and rewrite processing when a buffer underrun occurs as in the actual write processing. 2 cannot detect the data already recorded and cannot start rewriting. In such a case, the CD-R / RW,
By starting writing with a wobble signal on a DVD-R / RW or DVD + RW optical disc, rewriting can be performed normally even when there is no write data on the optical disc 2.

FIG. 9 is a diagram showing the relationship between the ATIP sink on the optical disk 2 and the demodulated ATIP sink.
As can be seen from FIG. 9, when performing the test write, the ATI
Similarly, in the case of performing positioning using a P-sync, a peculiar demodulation delay occurs when a wobble signal is demodulated. When rewriting is performed, it is necessary to correct the demodulation delay in order to accurately connect data on the optical disc 2. By allowing the write control unit 34 to set the correction amount arbitrarily, it is possible to correct the demodulation delay regardless of the difference between the optical pickup, the decoder, and the like, so that accurate rewriting can be performed.

As shown in FIG. 10, when both the write end data and the rewrite data are pits, if a gap is opened due to an alignment error at the joint of data at the time of rewrite, an incorrect space corresponding to the gap, that is, There will be no pits. Since the PLL for reading data in the CD decoder 5 is controlled even with the minimum or maximum pit or space length determined by the standard, there is a possibility that the data will be disturbed if there is a space having a length outside the standard. For this reason, by setting the space for both the write end data and the rewrite data, the above-described problem can be avoided even if there is a gap at the data joint.

Also, E which is actually recorded on the optical disc 2
As shown in FIG. 11, two types of FM data are generated from an EFM code. When a margin bit starts with a space and a sync code starts with a pit, the FM data is connected by a margin bit. For this reason, it is generally assumed that the predetermined length,
In the case where the margin bit having a length of 3T (T indicates one cycle of the clock signal CK) becomes 3T or more due to rotation fluctuation of the spindle motor or synchronization deviation, the CD decoder 5 performs If the sync pattern can be recognized by the synchronization protection, it can be read normally. That is, both the subcode data and the main data can be read without error. Note that the clock signal CK in FIGS.
Indicates a channel clock signal.

In general, the CD decoder 5 performs synchronization protection for the sync portion and error correction for the data portion in consideration of a read failure when reading data. Even in performing such synchronization protection, it is better to perform the connection of data at the sync portion. Further, by the function of connecting the data in the space of the sync pattern as described above, the error of the write position alignment can be eliminated by using the synchronization protection function of the CD decoder 5.

In the above description, a case where data is written to an optical disk by CLV control has been described as an example. CL
Since the V control is performed, there arises a problem as to how to make the gap between the data joints and the data joint as described above. As described above, in the CLV control, the rotation control is performed by the clock of the writing system, so that the rotation control error of the spindle motor and the phase difference between the clocks of the reading system and the writing system may inevitably cause an alignment error at the data joint. There is. Further, even if the rotation fluctuation of the optical disk due to the phase difference between the read system clock and the write system clock is minimized, there is a problem that a sampling error occurs.

On the other hand, the wobble signal read from the optical disk is changed to PLL according to the rotation speed of the optical disk.
In the CAV control for controlling to lock, both the write end position and the rewrite position can be adjusted by the wobble signal, so that the alignment error at the data joint as in the case of the CLV control can be reduced. In addition, in the CAV control, the writing system clock follows the operation of the spindle motor, so that the rotation fluctuation of the optical disk can be completely ignored, and the reading system and the writing system can be synchronized. The occurrence of errors can also be suppressed.

When the CAV control is performed, the clock signal generator 30 shown in FIG. 4 is inputted via the ATIP decoder 11 instead of the 33.8688 MHz clock signal inputted from the crystal oscillator (not shown). The binarized wobble signal is input. The clock signal generator 30 generates a channel clock signal from the input wobble signal and outputs the channel clock signal to each unit in the CD encoder 12.

As described above, in the optical disc device according to the first embodiment, the write control unit 34 writes the EFM frame at the time of the pause write PW based on the time information at that time and the subcode sync to be written. Information is stored in a built-in register, data writing is performed until the end of the EFM frame, and the writing process is interrupted.
From the time information of the subcode or the time information of the subcode, when the writing is interrupted, the subcode sync is awaited. When the subcode sync is detected, the position where the number of the EFM frames stored in the register at the time of the writing interruption is counted. Start rewriting from. From this, it is possible to accurately connect data on the optical disc at the time of rewriting, to suspend data writing when a buffer underrun occurs, and to perform data writing again as if continuous data writing was performed. Can be rewritten.

Second Embodiment In the first embodiment, when a buffer underrun occurs during the data writing process on the optical disc, the writing process is temporarily stopped, the data is received from the host computer, and the data writing process is performed again on the optical disc. I made it. On the other hand, during the process of writing data to the optical disk, the wobble signal read from the optical disk may not be able to be normally demodulated due to track jumps and / or scratches caused by an impact on the optical disk device or the like.

Therefore, in the optical disk device according to the first embodiment, even when an emergency write processing stop factor such as tracking error or spindle error is detected, the write process is temporarily interrupted and the factor is released. After that, the data writing process for the optical disc may be performed again, and such a process is referred to as a second embodiment of the present invention.

FIG. 12 is a block diagram showing a schematic configuration example of an optical disk device according to the second embodiment of the present invention, and FIG. 2 also shows a CD-R as an example. 12, the same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted, and only the differences from FIG. 12 will be described.

The difference between FIG. 12 and FIG. 1 is that the ATIP decoder 11 and the servo circuit 15 in FIG. 1 cannot properly demodulate the wobble signal read from the optical disc due to tracking error, spindle error, or the like. 1 to output a signal indicating the occurrence of an abnormality to the CD encoder 12 to interrupt the data writing process to the optical disc 2.
The IP decoder 11 is replaced with an ATIP decoder 11a, and FIG.
The CD encoder 12 is replaced with a CD encoder 12a, the servo circuit 15 of FIG. 1 is replaced with a servo circuit 15a,
Accordingly, the optical disk device 1 of FIG. 1 is changed to an optical disk device 1a.

In FIG. 12, when the servo circuit 15a cannot demodulate the wobble signal normally due to a flaw or the like on the optical disk and cannot perform servo control normally,
A signal indicating the abnormality is output to the CD encoder 12a,
The D encoder 12a immediately stops the process of writing data to the optical disc 2 and performs pause writing. At this time, a signal indicating the abnormality is also output from the ATIP decoder 11a to the CD encoder 12a. The ATIP decoder 11a detects that an abnormality has occurred after reading a wobble signal to some extent, and outputs the detected signal to the CD encoder 12a. Therefore, the abnormal signal from the servo circuit 15a
It is input to the CD encoder 12a earlier than the P decoder 11a.

On the other hand, when a track jump occurs due to an impact or the like, the CD encoder 12a
An abnormality in the ATIP time information decoded and input in 1a is detected, and as soon as the abnormality is detected, the process of writing data to the optical disc 2 is stopped and pause writing is performed.
At this time, a signal indicating a servo abnormality is also momentarily input from the servo circuit 15a. However, since the time during which the signal is input is extremely short, the CD encoder 12a immediately responds to the abnormality signal by sending the signal to the optical disk 2. There is a case where the data write processing is stopped and the pause write is not performed.

FIG. 13 is a schematic block diagram showing a configuration example of the CD encoder 12a. 13, the same components as those in FIG. 4 are denoted by the same reference numerals, and the description thereof will be omitted, and only the differences from FIG. 4 will be described. 13, the CD encoder 12a includes a clock signal generation unit 30, a RAM unit 31 for CIRC operation, a CIRC operation unit 32, an EFM encoder unit 33, and a write control unit 34a.

The write control unit 34a includes the ATIP time information input from the ATIP decoder 11a and the ATIP time information.
When an urgent write processing stop factor such as tracking error or spindle error is detected from an abnormal signal or a servo abnormal signal input from the servo circuit 15a, the pause light described in the first embodiment is performed. Interrupt the data write process. At this time, the write control unit 34
a indicates that the write control unit 34 of the first embodiment
The same operation as when the pause light command is output from the PU 20 is performed. Further, the write control unit 34a writes a status indicating that the data write process has been interrupted into a built-in register (not shown). CPU 20
Reads the status written to the register of the write control unit 34a, and recognizes that the write control unit 34a has performed the pause write.

Further, the write control unit 34 a
ATIP time information input from the decoder 11a and A
When it is determined from the TIP error signal or the like or the servo error signal input from the servo circuit 15a that the urgent write processing stop factor has disappeared, a status indicating that the write process stop factor has disappeared is written to the built-in register. The CPU 20 reads the status written in the register of the write control unit 34a, recognizes that the urgent write processing stop factor has disappeared, and outputs a restart write command to the write control unit 34a.

The write control unit 34a performs the same operation as the operation when the restart control command is output from the CPU 20 by the write control unit 34 of the first embodiment. The exceptional operations of the ATIP decoder 11a, the servo circuit 15a, and the write control unit 34a are the same as those of the ATIP decoder 11, the servo circuit 15, and the write control unit 34 in the first embodiment, and a description thereof will be omitted.

Here, the following cases can be considered as causes of the emergency stop of the data writing process to the optical disk.
When the continuity of the ATIP time information input from the ATIP decoder 11a is interrupted, the write control unit 34a
That is, the data for complementation is compared with the demodulated data,
If the RC result is OK but does not match the complementing data, it is considered that continuity has been interrupted, and pause light is performed. In addition, the write control unit 34a executes the pause write when the number of consecutive times that the ACRC result is NG exceeds a preset allowable number.

The ATIP decoder 11a outputs A
When the TIP sink cannot be detected, interpolation of the ATIP sink is performed. When the interpolation exceeds the allowable number, a predetermined ATIP abnormality signal is output to the write control unit 34a, and the write control unit 34a outputs the ATIP abnormality signal. When is input, the pause light is executed. Further, the ATIP sink is defined so that the shift amount with respect to the subcode sync to be written on the optical disk is within a specified value, and the write control unit 34a executes the pause write when the shift amount exceeds the specified value. . Specifically, for example, when the ATIP sync cannot be detected within a window (Window) indicating ± 2 EFM frames specified by the Orange Book, the write control unit 34a executes a pause write.

On the other hand, when the result of the phase comparison of the spindle servo exceeds the allowable number, the servo circuit 15a outputs a predetermined servo abnormality signal to the write control unit 34a, and the write control unit 34a executes a pause write. Further, the servo circuit 15a detects a shock to a portion where the optical disc is to be driven, and when detecting the shock, outputs a predetermined signal to the write control unit 34a, and the write control unit 34a
Execute the pause light.

FIG. 14 is a flowchart showing an example of a write control operation in the optical disk device shown in FIGS. In FIG. 14, the flow of performing the same processing as in FIG. 5 except that the write control unit 34 in FIG. 4 is replaced with the write control unit 34 a is indicated by the same reference numeral as in FIG. Only differences from the fifth embodiment will be described. The difference between FIG. 14 and FIG.
Between step ST1 and step ST2
T21 is provided with step ST22 between step ST2 and step ST3 in FIG. 5, step ST23 is provided between step ST3 and step ST4 in FIG. 5, and between step ST9 and step ST10 in FIG. That is, step ST24 is provided.

In FIG. 14, after performing the process of step ST1 of FIG. 5, the write control unit 34a determines whether an emergency write process such as tracking loss or spindle error has occurred from the signals input from the ATIP decoder 11a and the servo circuit 15a. It is determined whether or not a stop factor has occurred (step ST21). If it is determined in step ST21 that an emergency write processing stop factor has occurred (YES), the process proceeds to step ST9 in FIG. If it is determined in step ST21 that no urgent write processing stop factor has occurred (N
O), after performing the process of step ST2 in FIG. 5,
The write control unit 34a determines whether or not an urgent write processing stop factor such as tracking error or spindle error has occurred from the signals input from the ATIP decoder 11a and the servo circuit 15a (step ST22).

If it is determined in step ST22 that an emergency write processing stop factor has occurred (YES), the process proceeds to step ST9 in FIG. If it is determined in step ST22 that no urgent write processing stop factor has occurred (N
O), after performing the process of step ST3 in FIG. 5,
The write control unit 34a determines whether or not an urgent write processing stop factor such as tracking error or spindle error has occurred from the signals input from the ATIP decoder 11a and the servo circuit 15a (step ST23).

If it is determined in step ST23 that an urgent write processing stop factor has occurred (YES), the process proceeds to step ST9. If it is determined in step ST23 that no urgent write processing stop factor has occurred (NO), the processes in steps ST4 to ST7 in FIG. 5 are performed, then this flow ends, and data writing ends in step ST5. If not (NO), the process returns to step ST21.

After performing the process of step ST9 in FIG. 5, the write control unit 34a sets the ATIP decoder 11
a and the signal input from the servo circuit 15a, it is determined whether or not an urgent write processing stop factor such as tracking error or spindle error has occurred (step ST2).
4). If it is determined in step ST24 that an urgent write processing stop factor has occurred (YES), step ST2 is performed.
4 is performed. If it is determined in step ST24 that no urgent write processing stop factor has occurred (NO),
After performing the processing of steps ST10 to ST13 in FIG.
It returns to step ST22.

As described above, the optical disk device according to the second embodiment is deviated from the ATIP time information and ATIP abnormal signal input from the ATIP decoder 11 and the servo abnormal signal input from the servo circuit 15a. When an urgent write processing stop factor such as a spindle error or the like is detected, the pause write described in the first embodiment is performed to interrupt the data write process. When the urgent write process stop factor disappears, the first write process stops. The restart light described in the embodiment is performed.
Therefore, even when an emergency stop needs to be performed due to a spindle error, tracking error, or the like during the writing process on the optical disk, the writing process on the optical disk can be performed normally.

[0091]

As is apparent from the above description, according to the optical disk apparatus of the present invention, the write control unit stores data in the data processing unit and the encoder unit when interrupting data writing to the optical disk. The access to the data storage unit is stopped after the access to the unit is completed, and the storage of the write data in the data storage unit is stopped. Therefore, the interleave can be managed and the DSV operation can be prevented from being disturbed. Even when the data writing process on the optical disc is temporarily suspended and then restarted, the data Can be read as in the case where writing is continuously performed without interruption.

Further, the writing control unit may detect abnormality of various information read from the optical disk at the time of data writing, and may interrupt the data writing process to the optical disk when the abnormality is detected. By doing so, if it becomes necessary to perform an emergency stop due to a spindle error, tracking error, or the like during the writing process on the optical disk, the writing process on the optical disk can be interrupted, and failure to write data on the optical disk can be prevented. Can be prevented.

[0093] In this case, the write operation command unit, when the write control unit detects that the various kinds of information read from the optical disc have become normal after detecting the abnormality and interrupting the data write process, The writing control unit restarts data writing from the writing end position when the data writing process is interrupted. Therefore, even when it is necessary to perform an emergency stop due to a spindle error, tracking error, or the like during the writing process on the optical disk, the writing process on the optical disk can be performed normally.

Further, there is provided an end position information storage unit for storing information indicating a data write end position on the optical disk,
When the data writing to the optical disk is completed, the position information on the optical disk at the time of the end is stored in the end position information storage unit. From this, it is possible to easily confirm the seek position and the write start position when performing the rewrite processing.

More specifically, the write end position stored in the end position information storage is detected from the position information obtained from the data recorded on the optical disk. As described above, when the data recorded on the optical disk is read, a timing signal indicating one sector or one frame is extracted in each format of CD-R / RW, DVD-R / RW, and DVD + R, and these timing signals are extracted. By using, it is possible to synchronize with the data already written on the optical disk, and to perform rewriting from the immediately preceding write end position.

When data is written to the optical disk, the write operation is not actually performed in order to confirm whether or not the writing can be completed normally. Write may be performed. As in the case of actual writing, when a buffer underrun occurs and data writing is interrupted and data is to be written again, the test writing does not actually write to the optical disk. Data cannot be detected, and rewriting cannot be started.
In such a case, CD-R / RW, DVD-R / R
By starting writing at a timing using absolute position information obtained from wobbles formed on a W, DVD + RW optical disc, rewriting can be performed normally even when there is no write data on the optical disc.

Further, when demodulating the wobble formed on the optical disk, a peculiar demodulation delay occurs. At the time of rewriting, it is necessary to correct the demodulation delay in order to accurately connect data on the optical disk, and by enabling the correction amount to be set arbitrarily, the optical pickup,
The demodulation delay can be corrected irrespective of the difference in the decoder and the like, and accurate rewriting can be performed.

More specifically, when writing data from the write end position, the write operation command unit uses the end position information stored in the end position information storage unit to perform the rewrite position and rewrite. Can be determined.

Further, the current position on the optical disk may be compared with the end position information stored in the end position information storage unit, and the rewriting operation may be automatically performed at the time of coincidence. By doing so, it is possible to reduce the load on the write operation command unit used by the CPU or the like.

When rewriting is not started normally due to a problem such as that the writing end position is not found at the time of detecting the writing end position stored in the end position information storage section, the rewriting of rewriting is performed. When reseek is performed, there is a possibility that a rewrite operation is started after a write end position is found while the read state is unstable. At the time of retry of rewriting, after the reseek is performed and the read state is stabilized, the write end position is detected, so that the start of rewriting in an unstable state can be prevented.

On the other hand, when the write end data and the rewrite data are pits, when a gap is formed at the data connection position due to a data connection alignment error at the time of rewriting, a space corresponding to the gap is created. Since the data reading PLL is controlled by the minimum or maximum pit or space length determined by the standard, if there is a space having a length outside the standard, the PLL may be disturbed. Therefore, by setting both the write end data and the rewrite data as a space, it is possible to prevent the data reading PLL from being disturbed even if there is a gap between the data joints.

More specifically, the data connection position is set to EFM.
By providing a space for the frame sync, an error in the write start position can be absorbed by the synchronization protection performed at the time of demodulation of the read data, and data write processing capable of performing accurate reproduction can be performed.

A clock signal serving as a reference clock at the time of data writing is adjusted according to the rotation speed of the optical disk.
Since the CAV control for generating the PLL lock to the wobble signal read from the optical disk is performed, the write end position and the rewrite position can be adjusted by using the wobble. The error in the data connection position can be further reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration example of an optical disc device according to a first embodiment of the present invention.

Fig. 2 CD-R / RW specified in the Orange Book
FIG. 4 is a diagram showing a format of a data write unit of FIG.

FIG. 3 is a diagram showing an example of a format when writing the data shown in FIG. 2 in a plurality of times;

FIG. 4 is a schematic block diagram showing a configuration example of a CD encoder 12 of FIG.

FIG. 5 is a flowchart showing an example of a write control operation in the optical disk device shown in FIGS. 1 and 4;

FIG. 6 is a diagram showing a positional relationship between the end of writing and the start of writing of data on the optical disc 2 defined in the Orange Book.

FIG. 7 is a diagram showing an example of forming data joints on an optical disc 2;

FIG. 8 is a diagram showing a relationship between a subcode sync and a frame sync on the optical disc 2, and a subcode sync and a frame sync after demodulation.

FIG. 9 is a diagram showing a relationship between an ATIP sink on the optical disc 2 and an ATIP sink after demodulation.

FIG. 10 is a diagram showing an example of a state of data joints on the optical disc 2;

FIG. 11 is a diagram showing an example of EFM data recorded on an optical disc 2.

FIG. 12 is a block diagram illustrating a schematic configuration example of an optical disc device according to a second embodiment of the present invention.

13 is a schematic block diagram illustrating a configuration example of a CD encoder 12a in FIG.

FIG. 14 is a flowchart illustrating an example of a write control operation in the optical disc device illustrated in FIGS. 12 and 13;

[Explanation of symbols]

 Reference Signs List 1, 1a optical disk device 2 optical disk 3 optical pickup 4 read amplifier 5 CD decoder 8 buffer manager 9 buffer RAM 10 host interface 11, 11a ATIP decoder 12, 12a CD encoder 13 CD-ROM encoder 14 laser control circuit 20 CPU 30 clock signal generation Unit 31 CIRC calculation RAM unit 32 CIRC calculation unit 33 EFM encoder unit 34, 34a Write control unit 35 CD interface unit 15a Servo circuit

Claims (13)

[Claims] 1. An optical disc apparatus for recording and reproducing information on and from a data writable optical disc on which address information indicating a position of a data unrecorded portion is formed in advance, for writing on an optical disc transferred from outside. A data storage unit for temporarily storing data for performing predetermined data processing, a data processing unit for performing predetermined data processing on the data stored in the data storage unit, and processing by the data processing unit An encoder unit for modulating and outputting the written data by a predetermined method, an operation unit for controlling the operation of the data processing unit and the encoder unit, and a control for storing the write data in the data storage unit; A write control unit for controlling data writing to the data storage unit, and a state where supply of write data to the data storage unit is interrupted Perform the generation detecting a write operation command unit for performing an operation command to the write control unit in accordance with the detection result,
When suspending data writing to the optical disc, the writing control unit causes the data processing unit and the encoder unit to enter a standby state after the end of the access to the data storage unit and stop the access to the data storage unit. An optical disk device for stopping storage of write data in a data storage unit. 2. The method according to claim 1, wherein the writing control unit detects an abnormality of various information read from the optical disk at the time of data writing, and interrupts a data writing process to the optical disk when the abnormality is detected. An optical disk device as described in the above. 3. The writing operation command section, when the writing control section detects that the various kinds of information read from the optical disc have become normal after detecting the abnormality and interrupting the data writing process, 3. The controller according to claim 2, wherein the controller restarts data writing from a write end position when the data writing process is interrupted.
An optical disk device as described in the above. 4. An end position information storage unit for storing information indicating an end position of data writing on the optical disk, wherein the write control unit, when ending data writing on the optical disk, sets the position on the optical disk at the end of the writing. 4. The optical disk device according to claim 1, wherein information is stored in the end position information storage unit. 5. The write control unit according to claim 4, wherein the write control unit detects a write end position stored in the end position information storage unit from position information obtained from data recorded on the optical disk. Optical disk device. 6. The write control unit detects a write end position stored in the end position information storage unit from absolute position information indicating an absolute position of a data unrecorded portion formed in advance on the optical disc. The optical disk device according to claim 4, wherein: 7. The apparatus according to claim 1, wherein said write controller corrects a delay time generated when reading and demodulating position information obtained from the optical disk by using a preset correction value. 7. The optical disk device according to 5 or 6. 8. When writing data from a write end position, the write operation instructing unit reads light from and writes data to an optical disc based on the end position information stored in the end position information storage unit. 8. The writing control unit according to claim 5, wherein after the pickup is sought a predetermined value before the end position, the write control unit detects the write end position stored in the end position information storage unit. Optical disk device. 9. An optical pickup for reading and writing data from / to an optical disk from end position information stored in the end position information storage unit when writing data from a write end position. 8. The optical disk device according to claim 5, wherein after seeking a predetermined time before the end position, a write end position stored in the end position information storage unit is detected. 10. The write control unit, when writing data from a write end position, when the data write from the write end position is not started,
After interrupting the rewriting operation on the optical disk, again from the end position information stored in the end position information storage unit,
10. The optical disk device according to claim 9, wherein after the optical pickup seeks a predetermined value before the end position, the write end position stored in the end position information storage unit is detected. 11. The writing control unit sets the write data at the write end position and the write start data at the time of rewriting to a space indicating data that is inconsistent with data when pits are formed on the optical disk. Claims 1, 2, 3, 4, 5, 6, 7,
11. The optical disk device according to 8, 9, or 10. 12. The encoder section performs EFM modulation on the write data processed by the data processing section by a predetermined method and outputs the data. The write control section sets a write end position as a space for an EFM frame sync. 12. The optical disk device according to claim 11, wherein the writing start position is started from a space of the EFM frame sync. 13. A wobble read out from an optical disc in accordance with a rotation speed of an optical disc, wherein a write reference clock signal used for obtaining data write timing when data is recorded on the optical disc in order to perform CAV control. PL generated to be PLL-locked to a signal
10. The system according to claim 1, further comprising a clock signal generator configured by an L circuit.
Or the optical disk device according to 10.