JP2003308654A - Optical disk drive, and data recording system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk drive capable of particularizing a write interruption position at a point of time when interruption takes place during data write processing, and to provide a data recording system using the optical disk drive. <P>SOLUTION: The optical disk drive (4) includes: an access unit (18) for accessing an optical disk (6); and a drive control unit (12) for controlling the access unit to read designated read data from the optical disk (6). Syndrome processing units (24, 26, 52, 54) calculate a PI syndrome of the read data read by the access unit (18) and store it. An interruption position searching unit (56) detects the write interruption position in the read data on the basis of the calculated PI syndrome in response to a received detection instruction. A control unit (16) designates the read data to the drive control units in response to a search instruction and outputs the detection instruction to the interruption position searching unit. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device, and more particularly to an optical disk device in which a write interruption position can be searched for, and a data recording system using the same.

[0002]

2. Description of the Related Art Optical disks have been used as recording media as recording data has increased. As an optical disc,
CDs are common, but DVDs are becoming popular.

When recording a large amount of data on an optical disc such as a DVD, it takes a long time to record, and the recording operation may be interrupted midway. Also, data recording may be interrupted for some reason. In such a case, conventionally, additional recording has been possible.

FIG. 16 is a schematic view of Japanese Patent Laid-Open No. 2001-236651.
2 shows an optical disk device disclosed in A (prior art 1). With reference to FIG. 16, in this reference, the data transfer unit 103 transfers the data to the light emitting unit 102 while managing the position information of the data to be recorded. Light emitting unit 102
Records data by irradiating the optical disc 111 with laser light. When an error occurs and the laser light output of the light emitting unit 102 is stopped, the output stop detection unit 104 detects this and notifies the data transfer unit 103. Data transfer unit 103
Stores the position information of the data transferred at the time of receiving the notification in the position information storage unit 105.

As described above, in the prior art 1, the detection unit 104 detects that an error has occurred and the laser light output is stopped.
The data transfer unit 103 is notified of by this and the position information of the transferred data is stored. Therefore, when the power is suddenly turned off, it is impossible to specify the position where the writing is interrupted.

Further, FIG. 17 is a schematic view of JP-A-10-13447.
9 shows an optical disk device disclosed in Japanese Patent Publication No. 9 (Prior Art 2). In this reference, the CPU 207 determines that the battery 21
When the power supply voltage of 1 becomes lower than the preset reference voltage, the writing status information indicating whether or not the track address information on the optical disc 201 has been written is stored in the nonvolatile memory 208. When it is determined that the track address information on the optical disc 201 has not been written based on the writing status information stored in the non-volatile memory 208 when the power is turned on, the track address information is written to the optical disc 201, and the writing is completed. Ejection of the optical disc is prohibited until the end.

The prior art 2 has a circuit for detecting that the power supply voltage has dropped below a certain level, a circuit for detecting the position of writing on the disk at the time of detection, and a non-volatile memory. Therefore, even when the power is turned off, it is possible to retain the position information at which the writing is interrupted. In this way, additional recording of data is possible. However, it cannot be realized if the power supply voltage detection circuit, the write position detection circuit, and the non-volatile memory are not provided in the system.
Further, since the position where the writing is interrupted is specified only on a track unit basis, even if the writing process is executed again when the power is turned on, it is overwritten on a track unit basis.

As described above, according to the conventional technique, it is possible to store the exact position where the writing is interrupted even when the power is turned off, but the nonvolatile memory is still required.

In connection with the above description, a data decoding processing device is disclosed in Japanese Patent Laid-Open No. 2000-165259. This reference describes a reduction in the number of accesses to the buffer memory.

[0010]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an optical disk device capable of specifying the write interruption position at the time of interruption during the data writing process.

Another object of the present invention is to provide an optical disk device capable of specifying a write interruption position on a system not including a non-volatile memory.

Another object of the present invention is to provide an optical disk device in which data can be additionally recorded from a write interruption position.

Another object of the present invention is to be able to specify a write interruption position even when additionally writing data on an optical disc on which data has already been recorded, and to additionally write data from the write interruption position. It is to provide a data recording system.

[0014]

[Means for Solving the Problems] Means for solving the problems will be described below with reference to the numbers and symbols used in the embodiments of the present invention. These numbers and signs are added to clarify the correspondence between the description in [Claims] and the description of the embodiments of the invention,
It should not be used to interpret the technical scope of the invention described in [Claims].

According to a first aspect of the present invention, an optical disk device has an access unit (1) for accessing an optical disk (6).
8), a drive control unit (12) for controlling the access unit so as to read specified read data from the optical disc (6), and a PI syndrome of the read data read by the access unit (18). Syndrome processing unit (24, 26, 52, 5 for calculating and holding)
4), and in response to an input detection command, an interruption position search unit (56) for detecting a write interruption position in the read data based on the calculated PI syndrome, and in response to the search command. A control unit (16) for designating the read data to the drive control unit and outputting the detection command to the interruption position search unit. As a result, the write interruption position can be detected using the PI syndrome value on a system that does not include a nonvolatile memory. In addition, it becomes possible to additionally write data from the write interruption position.

The syndrome processing section (24, 26, 5
2, 54) has a syndrome storage unit (54) having N regions (N is an integer of 2 or more). Each of the N regions stores the calculated PI syndrome of one ECC block. The syndrome processing unit (24, 26,
52, 54) further includes a syndrome calculation unit (26) for calculating the PI syndrome of the read data,
A selector (52) for storing the calculated PI syndrome while switching the N area of the syndrome storage unit for each ECC block.

When the read data includes a plurality of ECC blocks, the interruption position searching unit (56)
The write interruption position is detected while controlling the selector so as to switch the N region for each block. As a result, the write interruption position can be detected even across a plurality of ECC blocks.

The interruption position retrieving section (56) sequentially traces from the last PI symbol correction line of the read data to the head direction, and the calculated PI syndrome is 0.
The first PI symbol correction line, that is, may be detected as the write interruption position. In this way, it is possible to search for the write interruption position in the first line direction from the last PI symbol correction line. In addition, the interruption position search unit (56)
May sequentially trace from the top PI symbol correction line of the read data toward the end, and detect the first PI symbol correction line where the calculated PI syndrome is not 0 as the write interruption position. In this way, it becomes possible to search for the write interruption position in the direction of the last line from the first Pi symbol correction line.

The control section (16) controls the number of times of unsynchronized mask detection by the syndrome processing section (24, 26, 52, 5).
Output to 4). The syndrome processing unit (24, 2
6, 52, 54) outputs a non-detection notification to the control unit based on the frame in which the read data is not synchronized and the number of times the control unit (16) does not detect the synchronization. The control unit (16) outputs a read stop command to the drive control unit (12). The drive controller (1
2) controls the access unit (18) to stop reading the read data from the optical disk (6) in response to the read stop command.

Here, the optical disk device further includes an encoder for encoding the recording data. In this case, the interruption position searching unit (56) outputs the writing interruption position to the control unit (16). In response to the data write command, the control unit (16) writes a write command to write the encoded recording data after the write interrupt position after the write interrupt position of the optical disc (6). Is output to the drive control section (12). The drive controller (12)
Responds to the write command by the access unit (18)
To control.

The data recording system comprises the above optical disk device (4) and a host device (2) for outputting the search command to the control section (16).

The host device (2) issues a data change command in response to a data recording command for the recording data, including the size of the recording data and the recording start position, to the control unit of the optical disc device (4). (16), and then outputs a data write command to the control section (16).
In response to the data change command, the control unit (16) instructs the drive control unit (12) to write dummy data on the optical disc (6) based on the size of the recording data and the recording start position. Output a dummy data write command. The drive control unit (12) controls the access unit (18) in response to the dummy data write command. In response to a data write command, the control unit (16) controls the drive unit so that the drive control unit (12) controls the access unit (18) to write the recording data on the optical disc. Control the section (12). In this way, even for an optical disc on which data has already been written, PI
The write break position can be detected using the syndrome value. In addition, it becomes possible to additionally write data from the write interruption position.

According to another aspect of the present invention, there is provided a write interruption position searching method, comprising: (a) reading read data from an optical disc; (b) calculating a PI syndrome of the read data; When the reading of the read data is completed, a step of setting a search line number to the last PI symbol correction line of the read data, and (d) tracing the head direction in order from the last PI symbol correction line, Searching the first PI symbol correction line whose calculated PI syndrome is 0; and (e) writing the next PI symbol correction line in the last direction of the searched PI symbol correction line at the write interruption position. And step (f)
Even if the PI symbol correction line at the head is searched, when the PI symbol correction line having the calculated PI syndrome of 0 is not found, a step of notifying the fact is provided.

According to another aspect of the present invention, in a method for searching a write interruption position, (a) reading read data from an optical disc, (b) calculating a PI syndrome of the read data, and (c) ) When the reading of the read data is completed, a step of setting a search line number to the leading PI symbol correction line of the read data, and (d) tracing from the leading PI symbol correction line to the tail end in order. , The calculated P
Searching for the first PI symbol correction line whose I syndrome is not 0, (e) notifying the searched PI symbol correction line as a write interruption position, and (f) up to the last PI symbol correction line Even if a search is performed, the calculated PI syndrome is P that is 0.
If the I-symbol correction line is not found, a step of notifying it is provided. Here, the step (d) includes a step of detecting a predetermined number of continuous lines in which the calculated PI syndrome is not 0, while sequentially tracing from the head PI symbol correction line toward the tail end, and the predetermined number. When a non-zero consecutive line of minutes PI syndrome is detected, the first non-zero PI syndrome line is determined as the retrieved PI symbol correction line.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical disk device of the present invention and a data recording system using the same will be described below with reference to the accompanying drawings.

FIG. 1 is a diagram showing the configuration of the data recording system of the present invention. Referring to FIG. 1, an optical disc device 4
Sets an optical disk 6 such as a DVD disk, records data on the optical disk 6 according to an instruction from the host device 2, and reads data from the optical disk.
The optical disk device 4 executes a write interruption position search process in response to a command from the host device 2. At this time, the optical disk 6 is an unused one, in which data is written halfway, and the writing is interrupted there.

FIG. 2 shows the configuration of the optical disk device 4 according to the first embodiment of the present invention. Referring to FIG.
The optical disk device 4 according to the first embodiment includes a disk controller 12, a decoder 14, a CPU 16, and an access unit 1.
8, a rotary drive system 20, an encoder (not shown), and a buffer memory (not shown).

The CPU 16 controls the overall operation of the optical disk device 4. The CPU 16 gives instructions to the host device 2,
It exchanges notifications and data and controls the disk controller 12 and the decoder 14. It also performs the necessary calculations.

The access unit 18 writes the data on the optical disk 6 and reads the data from the optical disk 6 using the laser light. Access unit 18 is well known to those skilled in the art. Rotary drive system 20
Drives the optical disc 6 to rotate in response to an input command when the optical disc 6 is set.

The disk controller 12 controls the access unit 18 and the rotary drive system 20 so as to perform rotation, laser control, and data read / write on the optical disk 6. The disk controller 12 drives the rotation drive system 20 according to an instruction from the CPU 16 so that the optical disk 6 is rotated. In addition, the disk controller 12
Controls the position of the access unit 18 in accordance with an instruction from the CPU 16. It also controls the operation of the access unit 18 in the write mode and the read mode. In the write mode, the disk controller 12 controls the access unit 18 to write the data supplied from the encoder (not shown) on the optical disk 6. The access unit 18 emits laser light to write data on the optical disc 6. In the read mode, the disk controller 12
Access unit 1 for reading data from optical disk 6
Control eight. The access unit 18 emits laser light to read data from the optical disc 6. The read data is supplied to the decoder 14 through the disk controller 12.

In response to an instruction from the CPU 16, the decoder 14 performs a decoding process on the data read from the optical disk 6 in units of ECC blocks (16 sectors).

FIG. 3 shows details of the decoder 14. With reference to FIG. 3, the decoder 14 includes a search unit 22, a demodulation unit 24, a PI syndrome generation unit 26, and an error correction unit 2.
8, line buffer memory 30, PO syndrome generation unit 32, descramble / EDC calculation unit 34, PI syndrome storage unit 36, PO syndrome storage unit 38, E
A DC calculation result storage unit 40 and an error correction unit 42 are provided. A buffer memory 44 (not shown in FIG. 2) is connected to the decoder 14.

FIG. 4 shows details of the search unit 22.
Referring to FIG. 4, the search unit 22 includes a syndrome temporary storage unit 54 that temporarily stores the syndrome generated by the PI syndrome generation unit 26, a selector 52,
The write interruption position searching unit 56 is provided. The syndrome temporary storage unit 54 has areas 0 to N-1 (N is an integer of 2 or more).

The syndrome temporary storage unit 54 has a capacity of 2080 bytes per area (P of 1 ECC block).
It has a syndrome of 10 bytes corresponding to each of the 208 I-symbol correction lines and a total capacity of 2080 bytes). In response to the selection command from the PI syndrome generation unit 26, the selector 52 selects which of the regions 0 to N−1 of the syndrome temporary storage unit 54 to use. The selector 52 is a PI for one ECC block.
When the syndrome is stored in one area, another area is selected for the PI syndrome of the following ECC block. The selector 52 selects the area designated by the write interruption position search unit 56 for the write interruption position search process. The write interruption position search unit 56 executes a write interruption position search process and outputs the found write interruption position to the CPU 16.

The data read from the DVD optical disk 6 is demodulated by the demodulation section 24 and PI is set for each interleave.
Syndrome generation unit 26 and line buffer memory 30
Sent to. The line buffer memory 30 can store demodulated data for several lines. The PI syndrome generation unit 26, for each PI symbol correction line,
The demodulator 24 calculates the PI series syndrome of the data demodulated. The PO syndrome generation unit 32 calculates a PO series syndrome.

The syndrome is a coefficient Sj of the syndrome polynomial S (X) defined by the following equation.

[Formula 1] That is, the syndrome for the receiving polynomial Y (X) is obtained by substituting the root α ^{j of the} generator polynomial for the receiving polynomial. In the PI series, j = 0, 1, 2, ..., 9, t =
5 (ECC code / 2), and in the PO series, j =
0, 1, 2, ..., 15, t = 8 (ECC code /
2). When the syndrome Sj is generated and all are "0", there is no error in the ECC block. In other cases, it can be determined that there is an error. This determination is performed by the search unit 22.

FIG. 5 shows details of the PI syndrome generator 26. In FIG. 5, SYN [n] means S
This means performing Galois field multiplication with YNF [n]. The method of generating the syndrome is well known to those skilled in the art.

The error correction unit 28 calculates the position and size of the error in the PI sequence from the PI syndrome generated by the PI syndrome generation unit 26, and based on these, determines the error in the data stored in the buffer memory 44. Correct every interleave. When the error correction is completed, the syndrome becomes 0. The syndrome is stored in the PI syndrome storage unit 36.

The PO syndrome generation unit 32 generates a PO syndrome from the data from the line buffer memory 30, and stores the generated PO syndrome for one ECC block in the PO syndrome storage unit 38.

The descramble / EDC calculator 34 descrambles the data from the line buffer memory 30 and expands the descrambled data of one ECC block in the buffer memory 44. Furthermore, descramble /
The EDC calculation unit 34 adds E to the descrambled data.
Perform DC calculation. The EDC calculation result is stored in the EDC calculation result storage unit 40.

The error correction unit 42 reads the PO syndrome for one ECC block from the PO syndrome storage unit 38, calculates the error position and size of the PO series, and based on these, calculates the data stored in the buffer memory 44. Perform error correction. When the error correction of the PO syndrome is performed, the error correction unit 42 determines that the PI syndrome and the ED
C Correct the calculation result. The error correction unit 42 reads out the EDC calculation result of the corrected 1ECC block and sets it to 0.
If so, it is determined that the error correction has been correctly completed. When either is not 0, the error correction process is repeated.

Next, the format when data is read from the DVD optical disk 6 and stored in the buffer memory 44 will be described.

The data read from the DVD optical disk 6 in the read mode is demodulated by the demodulation section 24 and temporarily stored in the line buffer memory 30. After that, it is descrambled by the descramble / EDC calculator 34,
It is expanded in the buffer memory 44. The descramble data is stored from left to right and from top to bottom, as shown in FIGS. One line is 192 bytes.

One ECC block consists of 16 sectors,
One sector consists of 13 PI lines, and one line is 192
It is a byte. The 13th PI line of one sector is P
It is O parity. 10 bytes of PI parity is added to each PI line.

As described above, the ECC block has an error correction code PI parity for performing error correction processing in the horizontal direction and an error correction code PO parity for performing error correction processing in the vertical direction. There is.

In the present invention, as a method of detecting the position where the writing is interrupted, the horizontal correction code PI parity is used, and the syndrome calculation (= 0, no error exists, ≠
The error is present at 0) and the leading PI symbol correction line of the area in which the data is in error is continuously obtained to obtain the write interruption position.

Next, the write interruption position search process in the optical disk device of the present invention will be described with reference to FIGS. 8, 11 and 12. In this example, the DVD optical disk 6 is unused at this time, data is written once in the middle, and writing is interrupted in the middle.

Referring to FIG. 8, in step S2, the CPU
16 confirms whether the DVD optical disk 6 is set in the optical disk device 4. If not set, the process ends without doing anything. If the DVD optical disc 6 is set, the process proceeds to step S4. In step S4, the CPU 16 activates the disk controller 12, and the disk controller 12 transfers the data acquired from the DVD optical disk 6 to the decoder 14.

In step S6, the CPU 16 specifies the address of the DVD optical disk 6 where the write interruption position search process should be started, in the demodulation section 24 of the decoder 14. Succeedingly, in a step S8, the CPU 16 specifies the number of ECC blocks for which the write interruption position search process is to be performed, to the demodulation unit 24 of the decoder 14. In step S10, the CPU 16
Specifies the number of undetected synchronization masks, that is, the number of times synchronization is performed with an expected value even if synchronization of ESM frames is not detected at an expected interval, in the demodulation unit 24 of the decoder 14.

In step S12, the CPU 16 commands the write interruption position searching unit 56 of the decoder 14 to execute the write interruption position searching process. Then, step S14
Then, the CPU 16 waits until the write interruption position search process of the decoder 14 is completed.

When the write interruption position search process by the decoder 14 is completed, the CPU 16 determines in step S16 the ECC block address at which the write interruption position is detected by the decoder 14 as a result of the write interruption position search process of the decoder 14. And the PI symbol correction line number.

Next, the write interruption position search process executed by the decoder 14 in step S12 will be described with reference to FIGS.

The data read from the DVD optical disk 6 and transferred through the disk controller 12 is demodulated by the demodulation section 24. In step S22, the demodulation unit 24 of the decoder 14 waits for the write interruption position search processing start address from the data transferred from the disk controller 12. In step S24, the syndrome generator 2
6 performs a syndrome calculation for each PI symbol correction line on the data acquired from the disk controller 12 and demodulated by the demodulation unit 24. The obtained 10-byte syndrome is stored in the M area (0 ≦ M ≦ N) of the syndrome temporary storage unit 54, as shown in FIG. 1 EC
If the syndrome calculation of the data for C blocks and the storage of the syndrome in the M area (0 ≦ M ≦ N) of the temporary storage unit 54 are completed, the process proceeds to step S30. If not, the process proceeds to step S26.

In step S26, the demodulation section 24 counts the number of unsynchronized detection masks, and when the count exceeds the value set by the CPU and synchronization of the ESM frame is not detected (when continuous synchronization is not detected), The process returns to step S24. If detected, the process proceeds to step S28. Here, the demodulation unit 24 notifies the CPU 16 of this fact. The CPU 16 outputs a stop instruction to the disk controller 12. Further, it outputs a calculation stop instruction to the syndrome generation unit 26. Thus, in step S28, data acquisition and syndrome calculation are stopped. After that, the process proceeds to step S30.

In step S30, the selector 52 determines the temporary storage area (0 to N- of the syndrome temporary storage unit 54).
The process of switching 1) is performed.

In step S32, the write interruption position search unit 56 substitutes the final transfer PI symbol correction line number (the last PI line) into the search PI symbol correction line number, as shown in FIG. As is clear from the above, the final transfer PI symbol transfer line is not always the last line of the ECC block.

In step S34, the write interruption position search unit 5
Step 6 checks whether the syndrome value corresponding to the search PI symbol correction line number is 0. If the syndrome value is not 0, the process proceeds to step S36. Since PI syndrome is not 0 in the frame data after the write interruption position, the process proceeds to step S36.

In step S36, it is checked whether or not the retrieved PI symbol correction line number matches the leading PI symbol correction line number of the ECC block. If they do not match, the process proceeds to step S38. Step S38
Then, the search PI symbol correction line number is decremented by 1, and step S34 is executed again. That is, the search target line is moved up by one line.

In step S36, if the retrieved PI symbol correction line number matches the leading PI symbol correction line number of the ECC block, it means that there is no write interruption position in the ECC block to be retrieved. Therefore, the process proceeds to step S42. In step S42, the write interruption position searching unit 56 sets the corresponding disk address and the ECC block head PI symbol correction line number to C.
Notify PU16. Thereafter, the process proceeds to step S44.

If the syndrome value is 0 in step S34, it means that the data is correctly written in the line. Therefore, the process proceeds to step S40.
In step S40, the write-interruption-position searching unit 56 determines the relevant disk address and (PI symbol correction line number +
The CPU 16 is notified of 1). Thereafter, the process proceeds to step S44.

The write interruption position search unit 56 checks whether or not the data acquisition is stopped. If the data acquisition is not stopped, the process proceeds to step S46. If the data acquisition is stopped, the decoder 14 ends the write interruption position detection process. In step S46, the decoder 14 checks whether or not the search processing for the number of ECC blocks for performing the write interruption position detection processing designated by the CPU 16 has been performed. If the processing has been performed for the designated number of ECC blocks, the decoder 14 ends the write interruption position detection processing. If the processing has not been performed for the designated number of ECC blocks, the processing returns to step S22.

Next, a specific example of the interruption position search processing of the present invention will be described with reference to FIG. In this example, the ECC block address in which the writing is interrupted is K, the PI symbol correction line number is 189, and the PI symbol correction line number in which continuous synchronization undetection occurs is 200 (the number of synchronization undetection masks = 22: ESM / PI). The write interruption position search processing when there are two synchronization patterns per symbol correction line) is shown.

Since the write interruption position search processing is performed when the continuous synchronization non-detection occurs, the final transfer PI symbol correction line number becomes 200, and 200 is substituted for the search PI symbol correction line number.

Next, since the syndrome corresponding to the search PI symbol correction line number is not 0, the search PI symbol correction line number ≠ ECC head PI symbol correction line number. Therefore, the search PI symbol correction line number is decremented by -1, and the process is repeated.

Search PI symbol correction line number = 18
At 8, the syndrome corresponding to the search PI symbol correction line number = 0, so the write interruption position detection ECC block address = K, the search PI symbol correction line + 1.
= 189 is notified to the CPU 16.

The CPU 16 may execute the above-mentioned write interruption position search processing according to an instruction from the host device 2. When the CPU 16 receives a data write command from the host device 2, the CPU 16 may first automatically execute the write interruption position search process to acquire the ECC block address and the write interruption position. In this case, the CPU 16 may discard the data from the beginning of the data designated by the write command to the write interruption position, and write only the subsequent data. By doing so, the writing time can be shortened.

Next, a modified example of the first embodiment of the present invention will be described with reference to FIGS. The operation of the modified example is
Basically, it is similar to the operation based on FIGS.
The difference is that in the operation based on FIG. 11 and FIG. 12, the PI symbol correction line at the tail is searched in the head direction, whereas in this modified example, the PI symbol correction line in the head is searched in the tail direction. That is the point.

Steps S52 to 602 are the same as steps S22 to S30 in FIG. Also, step S
70, S72, S74 are steps S42, S4 in FIG.
4, the same as S46. Therefore, the description is omitted.

In step S62, the write-interruption-position searching unit 56 determines the head transfer PI symbol correction line number (head P
Substitute I line) for the search PI symbol correction line number.

In step S64, the write interruption position search unit 5
Step 6 checks whether the syndrome value corresponding to the search PI symbol correction line number is 0. If the syndrome value is 0, the process proceeds to step S66. Since PI syndrome is not 0 in the frame data after the write interruption position, the process proceeds to step S66.

In step S66, it is checked whether the retrieved PI symbol correction line number matches the last PI symbol correction line number. If they do not match, the process proceeds to step S68. In step S68, search P
The I symbol correction line number is incremented by 1, and step S is performed again.
64 is executed. That is, the search target line is moved down by one line.

If the retrieved PI symbol correction line number matches with the last PI symbol correction line number of the ECC block in step S66, it means that the write interruption position does not exist in the ECC block to be retrieved. . Therefore, the process proceeds to step S70. In step S70, the write interruption position searching unit 56 notifies the CPU 16 of the corresponding disk address and the PI symbol correction line number at the end of the ECC block. Then, the process is step S72.
Proceed to.

If the syndrome value is not 0 in step S64 (YES in step S64), step S67 is executed. In step S67, the number of consecutive lost lines is incremented by 1. Then, it is determined whether or not the number of consecutive disappearance lines is equal to a predetermined number. If the number of consecutive disappearance lines is not equal to the predetermined number, the process proceeds to step S66. If the number of consecutive lost lines is equal to the predetermined number, it is determined that the write interruption position has been detected. After that, (predetermined number -1) is subtracted from the search PI symbol correction line number, and the result is determined as the write interruption position. Therefore, the write interruption position search unit 56 notifies the CPU 16 of the corresponding disk address and (PI symbol correction line number). Then, a process progresses to step S72.

Since the syndrome of the line in which the burst error occurs at the time of transfer is not 0, it is not possible to simply determine the line where the syndrome is not 0 as the write interruption position.
For this reason, a parameter called the number of consecutive erasure lines is prepared, and when a line whose syndrome is not 0 is detected continuously for a predetermined number of times, the leading line whose syndrome is not 0 is detected as the write interruption position.

Next explained is an optical disc device according to the second embodiment of the invention. The configuration of the optical disc device according to the second embodiment is the same as the configuration of the optical disc device according to the first embodiment. Only the write interruption position detection process is different. In the second embodiment, the write interruption position search process is executed over 2 ECC blocks.

The decoder 14 outputs 1 of the ECC block # 1.
The syndrome calculation for the ECC block is completed, and E is stored in the area L (0 ≦ L ≦ N−2) of the syndrome temporary storage unit 54.
Store the syndrome for CC block # 1. The final transfer PI symbol correction line number is 207 which is the final PI symbol correction line number of the ECC block, and this is substituted for the search PI symbol correction line number. Further, the side storing the syndrome is switched to the syndrome temporary storage area L + 1.

In the decoder 14, the syndrome corresponding to the search PI symbol correction line number stored in the area L + 1 of the syndrome temporary storage unit 54 is not 0, and the search PI symbol correction line number ≠ ECC first PI symbol correction line number Therefore, the search PI symbol correction line number is set to -1, and the process is repeated again.

At the search PI symbol correction line number = N-1, the write interrupt position search unit 56 has the syndrome = 0 corresponding to the search PI symbol correction line number, so the write interrupt position detection ECC block address = K, search PI symbol correction line + 1 = N, CPU 16
To notify.

The write-interruption-position retrieval unit 56 continues to E
Syndrome calculation is performed on CC block # 2. 1
Before the syndrome is calculated for all PI symbol correction lines of the ECC, the continuous sync non-detection occurs and the transfer is stopped. The final transfer PI symbol correction line number is M, and this is substituted for the search PI symbol correction line number. In addition, the surface storing the syndrome is switched to the area L + 2 of the syndrome temporary storage unit 54.

The write interruption position search unit 56 determines that the syndrome corresponding to the search PI symbol correction line number stored in the syndrome temporary storage area L + 1 is not 0,
Since the search PI symbol correction line number is not equal to the ECC head PI symbol correction line number, the search PI symbol correction line number is set to -1, and the process is repeated.

Since the decoder 14 detects the search PI symbol correction line number = ECC head PI symbol correction line number, the write interruption position detection ECC block address = K + 1, the search PI symbol correction line = 0, and C
Notify PU16.

The CPU 16 may execute the above-mentioned write interruption position search processing according to an instruction from the host device 2. When the CPU 16 receives a data write command from the host device 2, the CPU 16 may first automatically execute the write interruption position search process to acquire the ECC block address and the write interruption position. In this case, the CPU 16 may discard the data from the beginning of the data designated by the write command to the write interruption position, and write only the subsequent data. By doing so, the writing time can be shortened.

Next explained is a data recording system according to the third embodiment of the invention. The above-described first and second embodiments can be applied to the case where data is written on an unused DVD optical disc 6 and the writing is interrupted midway. However, when the data is written, the above-mentioned write interruption position search processing cannot be applied. The third embodiment makes it possible to apply the first and second embodiments even in such a case.

That is, when a write command is given from the host device 2, the size of write data and the write start position are notified from the host device 2 to the CPU 16. In this case, CP
U16 controls the encoder and the disk controller 12 so as to write predetermined dummy data from the write start position to the area of the optical disk 6 corresponding to the size of the write data. By doing so, the PI syndrome of the previously written data is not zero. After writing the dummy data, the CPU 16 controls the encoder and the disk controller 12 so as to write the write data. In this way, even if the writing of the write data is interrupted, the interrupted position can be searched using the first and second embodiments.

[0085]

As described above, according to the optical disk device of the present invention, it is possible to specify the write interruption position when the power is turned off during the data writing process. Further, the write interruption position can be specified on the system that does not include the non-volatile memory. An optical disk device is provided.

According to the optical disk device of the present invention,
Data can be additionally written from the write interruption position.

Further, according to the data recording system of the present invention, the write interruption position can be specified even when the data is additionally recorded on the optical disc on which the data is already recorded.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a data recording system of the present invention.

FIG. 2 is a block diagram showing a configuration of an optical disc device used in the data recording system according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a decoder 14 unit in the optical disc device according to the first embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a search unit in a decoder unit 14 in the optical disc device according to the first embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a syndrome generation section in a decoder 14 section in the optical disc device according to the first embodiment of the present invention.

FIG. 6 is a diagram showing a format for recording data in a DVD device.

FIG. 7 is a diagram showing a DVD ESM frame of 1 ECC block in a DVD device.

FIG. 8 is a CPU when searching a write interruption position.
It is a flowchart which shows operation | movement of 16.

FIG. 9 is a diagram for explaining a search operation of a write interruption position.

FIG. 10 is a diagram showing a syndrome stored in a search unit in a decoder 14 in the optical disc device according to the first embodiment of the present invention.

FIG. 11 is a flowchart showing an operation of the decoder 14 when searching for a write interruption position.

FIG. 12 is a flowchart showing an operation of the decoder 14 when searching for a write interruption position.

FIG. 13 is a flowchart showing a modified example of the operation of the decoder 14 when searching for a write interruption position.

FIG. 14 is a flowchart showing a modification of the operation of the decoder 14 when searching for a write interruption position.

FIG. 15 is a diagram illustrating a specific example of an operation of searching for a write interruption position.

FIG. 16 is a diagram showing an optical disc device of a first conventional example.

FIG. 17 is a diagram showing an optical disc device of a second conventional example.

[Explanation of symbols]

2: Host device 4: Optical disk device 6: DVD disc 12: Disk controller 14: Decoder 16: CPU 18: Access Department 20: Rotary drive system 22: Search Department 24: Demodulator 26: PI syndrome generation unit 28: Error correction unit 30: Line buffer memory 32: PO syndrome generation unit 34: Descramble / EDC calculator 36: PI syndrome storage unit 38: PO syndrome storage section 40: EDC calculation result storage section 42: Error correction unit 44: Buffer memory 52: Selector 54: Syndrome temporary storage 56: Write interruption position search unit

Claims (12)

[Claims] 1. An access unit for accessing an optical disc, a drive control unit for controlling the access unit to read specified read data from the optical disc, and a PI for the read data read by the access unit.
A syndrome processing unit that calculates and holds a syndrome; an interrupt position search unit that detects a write interrupt position in the read data based on the calculated PI syndrome in response to an input detection command; An optical disc device comprising: a control unit that, in response to a command, specifies the read data to the drive control unit and outputs the detection command to the interruption position search unit. 2. The syndrome processing unit according to claim 1, wherein the syndrome storage unit has an N region (N is an integer of 2 or more), and each of the N regions stores the calculated PI syndrome of one ECC block. An optical disk device comprising: a syndrome calculation unit that stores and calculates the PI syndrome of the read data; and a selector that stores the calculated PI syndrome while switching the N region of the syndrome storage unit for each ECC block. . 3. The interrupt position search unit according to claim 2, wherein when the read data is for a plurality of ECC blocks, the interruption position search unit sets the N blocks for each ECC block.
While controlling the selector to switch the area,
An optical disc device for detecting the write interruption position. 4. The interrupt position search unit according to claim 1, wherein the interrupt position search unit sequentially traces from the last PI symbol correction line of the read data in the head direction, and the calculated PI syndrome is 0. An optical disk device that detects a certain first PI symbol correction line as the write interruption position. 5. The interrupt position search unit according to claim 1, wherein the interrupt position search unit sequentially traces from the head PI symbol correction line of the read data toward the end, and the calculated PI syndrome is not 0. An optical disk device that detects the first PI symbol correction line as the write interruption position. 6. The frame according to claim 1, wherein the control unit outputs the synchronization non-detection mask count to the syndrome processing unit, and the syndrome processing unit is a frame in which synchronization is not obtained by the read data. Based on the number of synchronous undetected mask from the control unit, and outputs a non-detection notification to the control unit, the control unit outputs a read stop command to the drive control unit, the drive control unit, In response to the read stop command,
An optical disk device for controlling the access unit so as to stop reading the read data from the optical disk. 7. The encoder according to claim 6, further comprising an encoder for encoding recording data, wherein the interruption position searching unit outputs the write interruption position to the control unit, and the control unit writes data. In response to the command, a write command is output to the drive control unit so as to write the encoded recording data after the write interrupt position after the write interrupt position of the optical disc, and the drive control unit An optical disk device that controls the access unit in response to the write command. 8. A data recording system, comprising: the optical disk device according to claim 1; and a host device that outputs the search command to the control unit. 9. The host device according to claim 8, wherein the host device responds to a data recording command for the recording data, including a size of recording data and a recording start position, by issuing a data change command to the control of the optical disc device. And then outputs a data write command to the control unit, wherein the control unit responds to the data change command by generating dummy data based on the size of the recording data and the recording start position. A dummy data write command is output to the drive control unit so as to write on the optical disc, the drive control unit controls the access unit in response to the dummy data write command, and the control unit is a data write command. In response to the data, the drive control unit controls the drive control unit so that the drive control unit controls the access unit so as to write the recording data to the optical disc. Recording system. 10. (a) a step of reading read data from an optical disk; (b) a step of calculating a PI syndrome of the read data; and (c) a reading line number, when the reading of the read data is completed. Setting to the last PI symbol correction line of the read data, and (d) the first PI symbol whose calculated PI syndrome is 0, while sequentially tracing from the last PI symbol correction line in the head direction. A step of retrieving a correction line; (e) a step of notifying the next PI symbol correction line in the last direction of the retrieved PI symbol correction line as a write interruption position; Even if you search up to the line,
When a PI symbol correction line having the calculated PI syndrome of 0 is not found, a notification to that effect is provided, and a write interruption position search method. 11. (a) a step of reading read data from an optical disk; (b) a step of calculating a PI syndrome of the read data; and (c) a reading line number, when the reading of the read data is completed. (D) The first PI symbol correction line in which the calculated PI syndrome is not 0, while tracing from the leading PI symbol correction line in order toward the tail end, in order to set the leading PI symbol correction line of the read data. And (e) notifying the searched PI symbol correction line as a write interruption position, and (f) searching for the last PI symbol correction line even if the calculated PI syndrome When the PI symbol correction line with 0 is not found, the step notifying that Write interruption position search method comprising and. 12. The method according to claim 11, wherein in the step (d), the calculated PI syndrome is 0 while sequentially tracing from the head PI symbol correction line toward a tail end.
Detecting a predetermined number of non-consecutive continuous lines; and, when the predetermined number of non-zero continuous lines are detected, the first non-zero PI syndrome line is the retrieved PI symbol correction line. A method for searching a write interruption position, which comprises a step of determining.