JP2002184116A - Defect handling method and optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reproduce correctly recorded signals even when a defect is generated on an optical disk. SOLUTION: When the succeeding ECC(error-correcting code) block of an ECC block number '3' is defined as a defective block as shown in the figure C on an optical disk using a defect management system, this defective block and an ECC block which is positioned at the next position and which is shown with oblique lines are registered in a defect list as defective blocks. When the playing of the optical disk is performed by using an optical disk device performing a servo operation while utilizing recorded signals, at the time of reproducing an ECC block number '4' by skipping the defective blocks while avoiding defective positions based on the defect list, even when the optical disk device starts trace at the preceding defective block of the ECC block number '4', the device can start correctly the trace because there is not defect in this defective block and, thus, the device can reproduce the signal of the ECC block number '4' from the leading position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a defect processing method and an optical disk device. More specifically, when a defect is detected on an optical disk using the defect management method, not only the block or sector in which the defect is detected but also the preceding and following blocks or sectors are set as defect areas and replacement processing is performed.

[0002]

2. Description of the Related Art In recent years, the recording density has been improved so that a content having a large signal amount such as a video can be recorded on a randomly accessible recording medium. Also, with the improvement in recording density, the requirements for recording media have become stricter, and it is difficult to manufacture a complete recording medium free of defects in all recording areas. It will be expensive. For this reason, defect management is performed so that a signal can be correctly recorded and reproduced even if a defect occurs, assuming the occurrence of a defect in advance.

In this defect management, a position where signal recording / reproduction is not performed correctly is detected in, for example, a physical sector unit, the detected defective sector is registered in a defect list, and an area serving as a substitute for the defective sector is registered. Is secured, signal recording and reproduction can be performed correctly while avoiding defective sectors. As described above, by performing the defect management, it is possible to allow the occurrence of a defect in the recording medium, and it is possible to provide the recording medium at low cost even if the recording density is improved.

[0004]

By the way, an optical disk apparatus using an optical disk adopting such defect management, for example, an optical disk which is compatible with the DVD (Digital Versatile Disc) standard and uses a rewritable optical disk called a so-called DVD + RW. In the device, a DPP (Differential Push) is used to generate a tracking error signal.
-Pull) method is used. FIG. 9 is for explaining the DPP method. The output signal Sa from the photodetector 301A and the output signal Sd from the photodetector 301D of the four-split photodetector 301 are supplied to an adder 311 and a subtractor 312. Supplied. The output signal Sb from the photodetector 301B and the output signal Sc from the photodetector 301C are supplied to an adder 311 and a subtractor 312.

The adder 311 generates a signal SRF to which the output signals Sa to Sd are added. The subtractor 312 calculates the output signal S from the sum of the output signal Sa and the output signal Sd.
The addition value of b and the output signal Sc is subtracted, and the obtained subtraction signal TE1 is supplied to a subtractor 318 described later.

[0006] The output signal Se from the photodetector 302E and the output signal Sf from the photodetector 302F of the two-segment photodetector 302 for detecting the reflected light of the preceding beam are supplied to a subtractor 313. In the subtracter 313, the output signal Sf is subtracted from the output signal Se, and the obtained subtraction signal TE2 is added to the adder 31.
6. The signal SWB obtained by subtracting the output signal Sf from the output signal Se is used as a signal obtained by reading out a signal previously recorded as a wobble on an optical disc.

The photodetector 303G of the split photodetector 303
And the output signal S from the photodetector 303H.
h is supplied to the subtractor 314. In the subtractor 314,
The output signal Sh is subtracted from the output signal Sg, and the obtained subtraction signal TE3 is amplified by the variable gain amplifier 315 with the gain G2 and then supplied to the adder 316.

The adder 316 includes a subtraction signal TE2 from the subtractor 313 and a variable gain amplifier 315 from the subtractor 314.
, The subtraction signal (G2TE3) supplied through is added. The addition signal obtained by the adder 316 is amplified by the variable gain amplifier 317 with the gain G1, and then is subtracted by the subtractor 3.
18.

The subtractor 318 outputs an addition signal G 1 supplied from the subtraction signal TE 1 via the variable gain amplifier 317.
(TE2 + G2TE3) is subtracted to generate the tracking error signal STE.

In a read-only optical disk apparatus, a DPD (Different Differential) is used to generate a tracking error signal.
ial Phase Detection). FIG. 10 is for explaining the DPP method. The output signal Sa from the photodetector 304A and the output signal Sc from the photodetector 304C of the quadrant photodetector 304 are supplied to the adder 321 and the subtractor 322. Supplied. The output signal Sb from the photodetector 304B and the output signal Sd from the photodetector 304D are supplied to an adder 321 and a subtractor 322.

The adder 321 generates a signal SRF to which the output signals Sa to Sd are added. The signal SRF is supplied to the rising edge detection section 323 and the falling edge detection section 324.

The rising edge detecting section 323 binarizes the signal SRF, detects the rising of the binarized signal, and supplies a detection signal DTu to a sample hold section 325 described later. Also, the falling edge detection unit 3
At 24, the signal SRF is binarized, the falling of the binarized signal is detected, and the detection signal DTd is supplied to a sample hold unit 326 described later.

In the subtracter 322, the sum of the output signal Sb and the output signal Sd is subtracted from the sum of the output signal Sa and the output signal Sc, and the obtained diagonal difference signal Sdi is supplied to the sample hold units 325 and 326. Is done.

The sample and hold section 325 holds the signal level of the diagonal difference signal Sdi at the rising timing of the binarized signal obtained by binarizing the signal SRF based on the detection signal DTu, and outputs the hold signal Shu to the subtractor 327 as a hold signal Shu. Supply. Further, the sample hold unit 326 holds the signal level of the diagonal difference signal Sdi at the falling timing of the binarized signal based on the detection signal DTd and supplies the signal level to the subtractor 327 as the hold signal Shd. The subtracter 327 subtracts the hold signal Shd from the hold signal Shu to generate a tracking error signal STE.

As described above, the optical disc drive for recording and reproducing signals and the read-only optical disc drive have different methods of generating a tracking error signal. For example, when a signal is recorded on an optical disc, the recording operation is interrupted. When a certain period of time during which no pits are formed occurs for a certain period of time, an optical disc device using the DPD method generates a tracking error signal using only signals from the four-divided photodetector. If pits are not formed for a certain period of time, a tracking error signal cannot be generated correctly, and not only a portion where a defect has occurred but also a signal recorded after that position cannot be read. I will. In view of the above, the present invention provides a defect processing method and an optical disk device that can correctly reproduce a recorded signal even if a defect occurs.

[0016]

According to the present invention, there is provided a defect processing method, which comprises the steps of: performing recording and reproduction using an optical disk using a defect management method; The optical disc apparatus controls the operation of the recording / reproducing means for recording / reproducing a signal to / from the optical disc using the defect management method, and the operation of the recording / reproducing means. Control means for controlling the recording / reproducing means to read out a signal recorded on the optical disk to detect a defect on the optical disk, and when a defect is detected, determine the defect position and the defect position. An area up to a predetermined range is set as a defective area, and information indicating the defective area is recorded on the optical disc.

According to the present invention, when an initial defect or a secondary defect is detected on the optical disk, a predetermined sector from the defective sector is set as a defective sector together with the defective sector, and the position of the defective sector is determined. The indicated information is registered in the defect list of the optical disc. Alternatively, together with a block having a sector in which a defect has occurred, for example, a block next to the defective block is also set as a defective block, and information indicating the position of the defective block is registered in the defect list of the optical disc. Further, a defective sector that is a predetermined sector before the defective sector or a block before the defective block is also set as a defective block.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a recording medium,
For example, a rewritable optical disk that conforms to the DVD (Digital Versatile Disc) standard, so-called DVD + R
This figure shows a configuration in the case of an optical disk called W having a capacity of 3.0 gigabytes.

As shown in FIG. 1A, the optical disk has a lead-in area, a data area,
A lead-out area is provided. The lead-in area is provided with an embossed pit recording portion and a rewritable portion. The embossed pit recording portion indicates the physical specifications of the disc, information of the content supplier, and the like. The rewritable portion is used for a test on an optical disk or an optical disk device, and is used as an area for recording information for processing a defect on the optical disk as described later. In the data area, data signals such as video, audio, and various information are recorded. Further, a lead-out area indicating information for processing the end of the data area and processing defects on the optical disc is provided on the outer peripheral side of the data area, and the irradiation position of the light beam is within the range of the lead-in area to the lead-out area. It can be moved.

The data area has a physical sector number "0x31000
(0x indicates a hexadecimal number) ", and as shown in FIG. 1B, a spare area and a user data area are provided alternately. The replacement area is an area used as a replacement by a linear replacement described later when a defect is detected on the optical disk, and the user data area is an area used by a user to record various data signals.

FIG. 1C shows a defect list rewritably recorded in the lead-in area and the lead-out area. The defect list is information for processing a defect on the optical disk, and is configured so that not only a defect generated from an initial state on the optical disk but also a newly generated defect can be registered.

The defect list “PDL (Primary Defect Lis
“t)” indicates information on an initial defect detected before the optical disk 10 is used. Further, the defect list “SDL (Secondary Defect List)” indicates information on secondary defects detected after using the optical disc 10. The defect list “PDL” includes, for example, the positions of the physical sector numbers “0x30E80” and “0x30FC0” in the lead-in area, and the physical sector numbers “0x199000” and “0x1991” in the lead-out area.
Recorded from position "40". In addition, the defect list “SD
L "is a physical sector number" 0x30 "in the lead-in area.
It is recorded from the position of "E90" and the physical sector number "0x30FD0", and the position of the physical sector number "0x199010" and the physical sector number "0x199150" in the lead-out area. In this way, by duplicating the defect list and recording it in the lead-in area and lead-out area, even if information of one of the defect lists is lost, the information of the other defect list is used to correctly record and reproduce signals. It can be performed.

The following description will be made assuming that slip replacement is performed for an initial defect and linear replacement is performed for a secondary defect. FIG. 2 shows the operation in the case of slip replacement. According to the DVD standard, an ID (Identification),
IEC (ID Error Correction code), EDC (Error Det
1 data sector is formed by adding an outer code for error correction to 16 data sectors to which an inner code for error correction is added.
ECC blocks are generated, and recording and reproduction of signals are performed in ECC block units. Here, when no defect occurs in the optical disk, the ECC block numbers are consecutive as shown in FIG. 2A. The replacement area is an area used in a linear replacement described later, and when no secondary defect occurs, the area is skipped and the signal recording / reproducing processing is performed.

Next, FIG. 2B shows a case where an initial defect is detected and slip replacement is performed. For DVD + RW, 1
Assuming that replacement processing is performed in units of ECC blocks, when a defect is detected in the user data area, the ECC block (indicated by a cross-hatched portion) in which the defect is detected is skipped and the next ECC block is used.

For example, the E following the ECC block number "3"
When a defect is detected in the CC block, this EC
Skipping the C block, the next ECC block is set as the area of the ECC block number “4”. When a defect is detected in two ECC blocks following the ECC block number “8”, the two ECC blocks are skipped, and the next ECC block is set as the area of the ECC block number “9”. Therefore, assuming that the last ECC block number of the user data area when no defect is detected is “N”, when a defect is detected in four ECC blocks, as shown in FIG. The position is moved backward by 4 ECC blocks.
Information required for performing the above-described slip replacement is recorded on the optical disc as a defect list “PDL”. When the replacement area is not used, the logical sector number is the same as the replacement area and the EC where the defect is detected.
Assigned skipping C blocks.

FIG. 3 shows a defect list PDL for performing a slip replacement. The defect list “PDL” is 1
The area of the ECC block is allocated, and a PDL identification mark (for example, “0x2A50”) indicating that two bytes from the first byte position in the ECC block is the defect list “PDL”. Two bytes from the byte position “2” indicate the number N_PDL of PDL entries, which is information indicating the ECC block in which the initial defect has been detected. Four bytes from the byte position “4” indicate the number of updates of the contents of the defect list “PDL”. Four bytes from the byte position “8” indicate information SI indicating the size of the user data area between the replacement areas, for example, the number of ECC blocks. Four bytes from the byte position “12” indicate information SL indicating the size of the replacement area, for example, the number of ECC blocks. From the byte position “16”, information indicating the position of the defect, for example, the head physical sector number of the ECC block in which the initial defect is detected is indicated as a PDL entry.

In the linear replacement, as shown in FIG. 4A, a replacement area provided before the user data area is used as a replacement area for a defective ECC block. Here, when a secondary defect is detected, for example, when a secondary defect is detected with the ECC block number “3” as shown in FIG. 4B, the secondary defect is provided before the ECC block number “3”. The replacement ECC block of the ECC block number “3” is set in the replacement area. If a secondary defect is detected at the ECC block numbers “8” and “9”, the ECC block numbers “8” and “9” are added to the replacement area located before the ECC block numbers “8” and “9”. Is set as an alternative ECC block. Note that the logical sector number is assigned to the ECC blocks provided in the user data area and the replacement area excluding the ECC block where the defect is detected. The information required for performing the above-described linear replacement is a defect list “SDL”.
Is recorded on the optical disc.

FIG. 5 shows a defect list SDL for performing the above-described linear replacement. The defect list DL is 1E
The area of the CC block is allocated, and two bytes from the first byte position in the ECC block are used as an SDL identification mark (for example, “0x2A53”) indicating that the defect list is “SDL”. Two bytes from the byte position “2” indicate the number N_SDL of SDL entries, which is information indicating the ECC block in which the secondary defect has been detected. Four bytes from the byte position “4” indicate the number of updates of the contents of the defect list “SDL”. From byte position "8",
Information indicating the position of the secondary defect in units of 8 bytes, such as the ECC block number at which the secondary defect is detected, the sector position of the secondary defect, and the like are indicated.

Next, the optical disk 1 thus configured
An optical disk device that performs recording and reproduction of signals using 0 will be described with reference to FIG. The optical disk 10 is rotated at a predetermined speed by a spindle motor unit 21. The spindle motor unit 21 performs a driving process so that the optical disc 10 has a predetermined rotation speed by a spindle control signal SPC supplied from a servo processor 33 described later.

The optical disk 10 includes an optical disk device 20
The optical pickup 30 emits a light beam whose light amount is controlled. The light beam reflected by the optical disk 10 is applied to a light detection unit (not shown) of the optical pickup 30. The photodetector performs photoelectric conversion and current-voltage conversion based on the light beam reflected by the optical disk 10, generates a voltage signal having a signal level corresponding to the amount of reflected light, and supplies the signal to the read processor 31.

The read processor 31 generates a signal SRF using the voltage signal from the optical pickup 30,
Further, a waveform read processing is performed to generate a digital read data signal DRF. This read data signal DRF is supplied to the channel processor 35. Optical pickup 3
Tracking error signal STE based on the voltage signal from 0
Then, a focus error signal SFE is generated and supplied to the servo processor 33. Further, in the read processor 31,
The recorded signal SWB is read by wobbling the track of the optical disk 10. Here, when the address information is indicated by the wobble, a signal Dadr indicating this information is supplied to the system controller 50.

The recordable / reproducible optical disk device 20
Then, the optical pickup 30 and the read processor 31 generate a tracking error signal STE by a DPP (Differential Push-Pull) method.

The servo processor 33 controls the objective lens (not shown) of the optical pickup 30 based on the supplied focus error signal SFE such that the focal position of the laser beam is at the position of the recording layer of the optical disk 10. And generates a focus control signal SFC for the driver. Further, based on the supplied tracking error signal STE, a tracking control signal STC for controlling the objective lens of the optical pickup 30 is generated such that the irradiation position of the light beam is at the center position of the desired track, and the driver 34 generates the tracking control signal STC. To supply.

In the driver 34, the focus control signal S
A focus drive signal SFD is generated based on the FC, and a tracking drive signal STD is generated based on the tracking control signal STC. By supplying the generated focus drive signal SFD and tracking drive signal STD to an actuator (not shown) of the optical pickup 30, the position of the objective lens is controlled, and the light beam is focused at a desired track center position. Is controlled to tie

In the servo processor 33, a synchronizing signal SY supplied from a channel processor 35 described later is provided.
, A spindle control signal SPC for rotating the optical disc 10 at a predetermined speed is generated and supplied to the spindle motor unit 21. Furthermore, servo processor 3
In 3, the optical pickup 30 is moved to the optical disk 10 so that the irradiation position of the laser beam does not exceed the tracking control range.
A thread control signal SSC for moving in the radial direction is generated and supplied to the thread motor unit 22. The sled motor unit 22 drives the sled motor based on the sled control signal SSC to move the optical pickup 30 in the radial direction of the optical disk 10. Although not shown, the servo processor 33 also performs a loading operation of the optical disk 10 and a skew adjustment for setting the relationship between the optical axis of the light beam and the disk surface of the optical disk 10 to a predetermined positional relationship.

The channel processor 35 performs 8/16 decoding of the read data signal DRF, and supplies the obtained signal Dd to the data processor 36. Further, the channel processor 35 generates a synchronization signal SY synchronized with the read data signal DRF, and
Supply 3

In the data processor 36, a Reed-Solomon product code (Reed-Solomon
The error correction of the signal Dd is performed by the decoding process of the mon product code. The error-corrected signal is R
After being stored in a cache area which is a part of the area of the AM 37, for example, an ATAPI (A
T Attachment Packet Interface) and SCSI (Small
Computer System Interface) standard interface 3
8 is output.

When the data signal WD to be recorded on the optical disk 10 is supplied via the interface 38, the Reed-Solomon Product Code (Reed-Solomon Product Code)
The signal Dw obtained by performing the encoding process and the 8/16 encoding process in e) is supplied to the write processor 39. Further, the defect list “PD” recorded in the lead-in area or the lead-out area of the optical disc 10
When "L" or "SDL" is read, the signals of the defect list "PDL" or "SDL" are supplied to the system controller 50.

The write processor 39 generates a recording data signal Sw based on the signal Dw supplied from the data processor 36 and supplies the recording data signal Sw to the optical pickup 30. The optical pickup 30 controls the irradiation of the optical beam to the optical disc 10 in accordance with the recording data signal Sw. Further, the light processor 39 also adjusts the output level of the light beam so that the output of the irradiated light beam has a correct output level.

The system controller 50 controls each processor and the RAM 37 and the ROM 5 via the CPU bus 60.
1 and controls the operation of each processor based on an operation control program stored in the ROM 51. Further, the defect list “PDL, SDL” supplied from the data processor 36 is stored in the RAM 37. Here, when an access request is made from an external device such as a computer device using a logical sector number (logical address), referring to the information of the defect list stored in the RAM 37, skipping of a defect position or a search for a defect position is performed. The address is converted from the logical sector number to the physical sector number while using the corresponding spare area. Further, using the signal Dadr supplied from the read processor 31, the optical pickup 30 is driven so that the position of the physical sector number corresponding to the position requested by the external device is irradiated with the light beam. .

The system controller 50 determines whether or not a new defect has occurred in the optical disk based on the signal read from the optical disk 10. When a new defect is detected, the new defect is stored in the RAM 37. By updating the content of the defect list and recording it on the optical disk 10, the defect information of the optical disk 10 is also updated.

The optical disk device 20 constructed as described above
Then, when the rewritable optical disk 10 is used for the first time, a format process is performed. In this format processing, address information recorded in advance on an optical disc is read by wobbling a track by a method called ADIP (Address in Pre-groove), and a position is determined based on the read information, and invalid data is also determined. Record sequentially. Further, the recorded data is reproduced to determine whether the recording and reproduction have been performed correctly. Here, when a defective area where data cannot be correctly reproduced is detected, the defect list indicating the above-described defective area or the like is updated so that a signal recorded correctly can be reproduced while avoiding this defective area. Re-recording is performed on the optical disk 10.

The read-only optical disk device is, for example, an optical disk device 20 shown in FIG. 6 in which a processing circuit for recording an externally supplied data signal WD on the optical disk 10 is removed, and the optical pickup 3
0 and the read processor 31, the DPD (Different
ial Phase Detection) tracking error signal STE
Is generated.

Here, when it is detected that a defect has occurred in the optical disk 10 in the initial state, even if the reproduction is performed by a reproduction-only optical disk device, a correctly recorded signal can be reproduced while avoiding the defect. Register defect information. For example, the optical disk device 20 uses the optical disk 10
If a defect is detected while formatting the data, the physical sector number of the area determined to be defective is determined using the address information. Thereafter, when the formatting process is completed, the ECC block including the physical sector number in which the defect is detected is set as the defective block, and the next ECC block is correctly reproduced from the head while skipping the defective block in which the defect is detected. For example, one ECC block located next to a defective block in which a defect is detected is also a defective block. Further, a defect list “PDL” indicating the position of the defective block in which the defect is detected and the position of the defective block for approach is generated, and is recorded on the optical disc 10.

That is, as shown in FIG. 2C, when the ECC block next to the ECC block number “3” is determined to be a defective block, this defective block and the next ECC block indicated by hatching are used as the defect for the approach. It is registered as a block in the defect list “PDL”. Also, EC
When two defective blocks occur after the C block number “7”, the positions of these two defective blocks and the next ECC block are registered in the defect list “PDL”.

Therefore, as shown in FIG. 2C, when a data signal is recorded on the optical disk 10 in which a defective block has been registered, when there is no more area for recording the data signal in the area of the ECC block number "3", The data signal is continuously recorded in the area of the ECC block number “4” after the two ECC blocks. When there is no more area for recording a data signal in the area of the ECC block number "7", the data signal is continuously recorded in the area of the ECC block number "8" after three ECC blocks.

The optical disk 1 after formatting is completed
When a secondary defect is detected during recording / reproducing of a data signal using 0, even if reproduction is performed by a reproduction-only optical disk device, recording is performed correctly while avoiding the defect, as in the case of detecting an initial defect. The defect information is registered so that the reproduced signal can be reproduced.

That is, as shown in FIG. 4C, when a secondary defect is detected in the ECC block of the ECC block number “3”, the next ECC block number “3” where the secondary defect is detected is indicated by a hatched line. The ECC block with the ECC block number “4” is registered in the defect list “SDL”. Further, in the replacement area provided before the ECC block number “3”, the replacement ECC blocks of the ECC block numbers “3” and “4” are set as replacement blocks,
The position of this replacement block is ECC block number "3".
It is registered in the defect list “SDL” in association with “4”.
Similarly, when a secondary defect is detected in the ECC blocks with the ECC block numbers “8” and “9”, the ECC block numbers “8” and “9” where the secondary defect is detected and the next ECC block indicated by hatching The ECC block with the number “10” is registered as a defective block in the defect list “SDL”.
Further, in the replacement area provided before the ECC block number “8”, the replacement ECC blocks of the ECC block numbers “8” to “10” are set as replacement blocks, and the position of the replacement block is set to the ECC block number. It is registered in the defect list “SDL” in association with the block numbers “8” to “10”.

For this reason, as shown in FIG. 4C, when recording a data signal on the optical disk 10 in which a defective block has been registered, when the area for recording the data signal in the area of the ECC block number "2" runs out, After the data signal is recorded in the area of the ECC block numbers "3" and "4" provided in the spare area, the data signal is recorded in the area of the ECC block number "5" of the user data area. When the area for recording the data signal in the area of the ECC block number “7” runs out, the ECC block numbers “8” to “10” provided in the replacement area are used.
After the data signal is recorded in the replacement block area of
A data signal is recorded in the ECC block number “11” of the user data area.

As described above, the ECC block in which the defect is detected and the ECC block following this ECC block are
The next ECC jumps over the defective block where the defect is detected.
If a block is registered as a defective block for an approach for correctly reproducing from the beginning, when reproducing the optical disk 10 with a read-only optical disk device, a defective block having a defect in which a pit cannot be determined has occurred. Also, since the ECC block following this defective block is registered in the defect list, when reproducing the next ECC block by skipping over the ECC block registered in the defect list, a defective block for a defect-free approach is selected. The tracking servo can be correctly performed by utilizing the signal, and the signal recorded in the jump destination ECC block can be correctly read from the head.

For example, when an area where the pit cannot be determined due to a shortage of the light beam due to the influence of dust or the like during the recording operation occurs in the ECC block, or a DVD
RUB (Recording U) shown in FIG.
A link area is provided for each ECC block as in the (nit Block) configuration, and by starting recording and reproduction in the link area, recording and reproduction of data signals in the ECC block can be performed stably. In the case where an error occurs in the area where writing of signals in the link area is not performed well and an unrecorded portion is generated and a pit cannot be determined, a read-only optical disc apparatus using the DPD method is used. In such a case, as shown in FIG. 8, the signal SRF is lost in a region where the pit cannot be determined, and the tracking error signal STE cannot be generated correctly like the signal SRF. Can not be done.

Therefore, if tracing is started from a position in a defective block so that a signal can be correctly read from the beginning of the next ECC block by skipping over the defective block, the signal from the beginning of the ECC block is affected by the defect. May not be read correctly. Similarly, when an unrecorded portion occurs in the link area, a signal may not be correctly read from the beginning of the ECC block.

However, as described above, not only the defective block having the defect but also the defective block for the next approach without the defect is registered in the defect list.
When the signal of the next ECC block is read while skipping the defective block registered in the defect list, even if the trace is started from a position in the previous block, the previous defective block must be an ECC block having no defect. From
Signals can be read from the beginning correctly without being affected by defects.

When using an optical disk which performs a replacement process on a sector basis, for example, when using a DVD-RAM type optical disk which performs a slip replacement on a sector basis, when registering a defective sector in a defect list for the slip replacement, Is the time required for registering a defective sector and setting the area following this defective sector to a defective sector area for approach, that is, the time required for reading a recorded signal correctly after jumping over the defective sector. Is registered as a defective sector area.
In this way, the signal of the jump destination sector can be read correctly without being affected by the defect, similarly to the processing in the case of the ECC block unit.

Further, immediately after reading a recorded signal, if the pit enters an area where pits cannot be determined, a servo operation may be stopped because a correct tracking error signal cannot be obtained. When the servo operation is stopped in this way, it takes time to return the servo operation again, and it takes time to read the requested data from the optical disk.

For this reason, for example, as shown in FIG.
When the ECC block next to the CC block number “3” is determined to be a defective block, the ECC block located before this defective block is also registered as a defective block in the defect list “PDL”. When two defective blocks occur next to the ECC block number “7”, the two defective blocks and the ECC block located before the two defective blocks are also registered as defective blocks in the defect list “PDL”.

In this manner, even if the ECC block from which the signal has been read is a defective block indicated in the defect list, the first defective block is an ECC block having no defect. The signal reproducing operation can be performed without causing the servo operation to be stopped by entering into an area where it cannot be determined, and the defect avoiding operation can be stably performed.

When a secondary defect occurs, the positions of the defective block and the previous ECC block are similarly registered in the defect list "SDL". In this case, since the data signal may be already recorded in the ECC block located before the defective block, when registering the ECC block located before the defective block in which the defect is detected in the defect list, Performs a save process of reading the data signal of the ECC block and re-recording the data signal in the spare area. By performing such a save process, even if an ECC block in which a data signal is already recorded is registered in the defect list, the already recorded signal can be correctly read.

Further, when the replacement process is performed in sector units, a sector number area longer than the time required from the completion of signal reading until jumping based on the defect list is provided before the defective sector. If the replacement process is registered in the defect list, the same operation and effect as the replacement process in ECC block units can be obtained even when the replacement process is performed in sector units.

As described above, according to the above-described embodiment,
A read-only optical disk device that performs servo operations using recorded signals. Even if a rewritable optical disk that employs a defect management method is used, signals recorded on the optical disk can be correctly read without being affected by defects. Can be played.

[0061]

According to the present invention, when recording and reproduction are performed using an optical disk using the defect management method, when a defect is detected, the defect position and the area from the defect position to a position after a predetermined range are detected. Area. For this reason, when performing the servo operation using the recorded signal and performing the reproduction while avoiding the defect position, an area of a predetermined range having no defect after the defect position is regarded as a defect area. By starting the tracing from the area, the signal recorded next to the defective area can be correctly reproduced from the beginning. Further, since the area from the defect position to a position before the predetermined range is regarded as a defect area, it is assumed that a signal recorded before the defect area is read and then the defect position is avoided.
Even if the signal reading position enters the defect area, the area before the predetermined position of the defect position has no defect, so that the defect does not stop the servo operation. Therefore, a stable reproduction operation can be performed while correctly avoiding the defect position.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an optical disc.

FIG. 2 is a diagram for explaining slip replacement.

FIG. 3 is a diagram showing a configuration of a defect list PDL.

FIG. 4 is a diagram for explaining linear replacement.

FIG. 5 is a diagram showing a configuration of a defect list SDL.

FIG. 6 is a diagram showing a configuration of an optical disk device.

FIG. 7 is a diagram for explaining a RUB configuration.

FIG. 8 is a diagram showing a signal SRF waveform having a defect.

FIG. 9 is a diagram illustrating a DPP scheme.

FIG. 10 is a diagram illustrating a DPD method.

[Explanation of symbols]

10 optical disk, 20 optical disk device, 3
0 ... optical pickup, 31 ... read processor, 33 ... servo processor, 35 ... channel processor, 36 ... data processor, 37 ...
RAM, 39: light processor, 50: system controller, 51: ROM

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Kunihiko Miyake 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo F-term in Sony Corporation (reference) 5D044 BC06 CC06 DE03 DE37 DE62 DE64 DE83 EF05 FG19 5D090 AA01 BB04 CC02 CC14 DD03 FF02 FF08 FF27

Claims (6)

[Claims] When performing recording and reproduction using an optical disk using a defect management method, when a defect is detected in the optical disk, a defect position and an area from a predetermined range after the defect position to a defect area are defined as a defect area. A defect processing method characterized by setting. 2. The method according to claim 1, wherein the recording and reproduction are performed in a unit of recording and reproduction of a predetermined data amount, and an area from the defect position to a position after a predetermined range from the defect position is set in the unit of recording and reproduction. Item 1. The defect processing method according to Item 1. 3. The defect processing method according to claim 1, wherein when a defect is detected on the recording medium, an area from the defect position to a position before a predetermined range is set as a defect area. 4. A recording / reproducing unit for recording / reproducing a signal on / from an optical disk using a defect management system, and a control unit for controlling an operation of the recording / reproducing unit. Means for reading out a signal recorded on the optical disc to detect a defect in the optical disc, and when a defect is detected, setting a defect position and an area from a predetermined range after the defect position as a defect area. An optical disk device for recording information indicating the defective area on the optical disk. 5. The recording / reproducing apparatus according to claim 1, wherein the control unit performs recording / reproduction in a recording / reproducing unit having a predetermined data amount, and sets the defect position and an area from the defect position to a position after a predetermined range in the recording / reproducing unit. The optical disk device according to claim 4, wherein 6. The optical disk apparatus according to claim 4, wherein, when a defect is detected on the optical disk, the control unit sets an area from the defect position to a position before a predetermined range as a defective area.