JP2000339693A - Device and method for recording disk shaped recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently use the recording region of a disk shaped recording medium while the replacement region of defective sectors is kept to a minimum. SOLUTION: When a recording is conducted on a disk shaped recording medium 8 first time, data are error detection correction coded double in row and column directions to generate product code data, that are the units of the error detection correction code, and the product code data divided into a prescribed constant in a sector unit are recorded in the sectors on a first recording region (ADS) of the medium 8. A defective sector discriminating means discriminates whether a sector is a defective sector or not in a sector unit by reproducing the sector. When a sector is judged to be a defective sector, only the defective sector is skipped, the product code data to be recorded in the sectors after the defective sector are successively slipped for every one sector and are recorded in plural sector regions. The data to be recorded on the defective sector are replaceablly recorded on a second recording region to conduct a linear replacement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defect replacement method for a disk-shaped recording medium having a sector structure and an apparatus for recording and reproducing data on the disk-shaped recording medium using the defect replacement method. The present invention relates to an optical disc recording apparatus and a recording method for managing an optical disc defect by error detection and correction coding over a plurality of sectors.

[0002]

2. Description of the Related Art A disk-shaped recording medium is capable of high-speed random access, and can achieve a high recording density by narrowing a data track pitch and a bit pitch. Generally, a disc-shaped recording medium is made up of a magnetic disk and an optical disk depending on the recording method.
al disc), and further classified into a fixed type and a removable type according to the difference in the mounting form when used in the recording / reproducing apparatus. In a disk-shaped recording medium, data is generally recorded in a physical recording area composed of a minimum unit called a sector. Disc-shaped recording media have sectors that cannot be used to store data due to defects during manufacturing or damage after manufacturing. In addition to such defective data writing to a defective sector due to a defect in the disk-shaped recording medium itself, defective data writing due to the environment during use occurs as described below.

In recent years, optical disks such as DVDs have been widely used as large-capacity recording media due to their high recording density. In order to further increase the capacity, further higher recording density is being promoted. However, since the optical disk is generally made of a low-rigidity material such as polycarbonate, even the bending due to its own weight cannot be ignored. Further, such an optical disk recording medium is generally used as a replaceable removable recording medium. At the time of use, since the system is inserted into the recording / reproducing apparatus and fitted and fixed to the rotating spindle, the positional accuracy is not guaranteed.

Furthermore, optical disks are often used by being directly inserted into a recording / reproducing apparatus without being stored in a protective case. Further, even in the case where the protective case is used in the case where the protective case is used, the recording medium is completely exposed at the time of recording / reproducing because the protective case is not airtight. That is,
The optical disk recording medium has almost no shielding property against the surrounding atmosphere. A problem inherent to these optical recording media is that they are different from hard disk recording media which are fixed or removable magnetic recording media having a low recording density.

[0005]

As described above, in the conventional optical disk recording medium, due to its low rigidity, mounting accuracy and airtightness, when recording and reproducing data by inserting it into a recording apparatus, an optical pickup is required. The normal position of the recording / reproducing operation may be hindered by the relative position of the laser beam fluctuating or by the dust in the air blocking the laser of the optical pickup. In such a case, even if there is no defect or damage in the corresponding sector portion of the optical disk recording medium, data is recorded and reproduced over a wide recording area because of the narrow track pitch and dot pitch for higher recording density. And recording and reproduction errors of burst characteristics are likely to occur. Such a burst recording / reproducing defect is a problem that tends to occur in an optical disk recording medium, but is a problem common to all disk-shaped recording media that also occurs in the above-described magnetic recording medium.

[0006] In general, a recording defect includes a defect or damage of a recording medium itself and a recording-disabled state caused by use conditions. If this recording defect occurs when trying to record data in a target sector, the data is evacuated to a spare recording sector area prepared in advance, which is different from the sector, regardless of the cause. By recording, data is continuously recorded on the recording medium. Recording data to be written in a sector where a recording defect has occurred in a spare sector area in this way is called replacement recording, and a spare section area in which replacement recording is performed is called a replacement area.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a recording apparatus for a disk-shaped recording medium using a defect management method that enables a disk-shaped recording medium to be used efficiently while suppressing the required amount of alternative area. It is intended to provide a recording method.

[0008]

In order to achieve the above-mentioned object, a disk-shaped recording medium recording apparatus according to the present invention comprises: A disc-shaped recording medium recording apparatus for generating product code data as a unit and recording the product coded data on a disc-shaped recording medium having a plurality of recording sector structures, wherein the product code data has a size in sector units. Encoding means for dividing the divided product code data into sectors on a first recording area of the disc-shaped recording medium; and reproducing the sectors to reproduce the sector. A defective sector discriminating means for discriminating whether a sector is a defective sector or not, and when it is determined that the sector is a defective sector, skips only the defective sector and records the defective sector and subsequent sectors. First alternative means for sequentially slipping the product code data by one sector at a time and recording it in an area of a plurality of sectors in which the predetermined number and the number of defective sectors are added; There is provided a second alternative means for performing an alternative recording of data to be recorded in the sector and performing a linear replacement, and the first alternative means is used when recording on the disc-shaped recording medium for the first time.

Further, according to the disk-shaped recording medium recording method of the present invention, the data is double-error-correction-coded in the row and column directions to generate product code data which is a unit of the error-correction code, and A disc-shaped recording medium recording method of recording digitized data on a disc-shaped recording medium having a plurality of recording sector structures, wherein the product code data is encoded by dividing the product code data into a predetermined number in units of sectors. The product code data is recorded in sectors on the first recording area of the disk-shaped recording medium, and by reproducing the sector, it is determined whether or not the sector is a defective sector in units of a sector. If it is determined to be a defective sector, skip only the defective sector, and slip the product code data to be recorded in sectors subsequent to the defective sector one by one,
A first alternative method of recording using an area of a plurality of sectors obtained by adding the predetermined number and the number of defective sectors, and a method of alternately recording data to be recorded in a defective sector in a sector on a second recording area. There is a second alternative method for linear replacement, and the first alternative method is used when recording is performed on the disc-shaped recording medium for the first time.

According to the above configuration and method, by performing the alternative sector processing on the error correction code unit of a plurality of sectors in units of one sector, even when a defective sector occurs, the consumption of the alternative sector is small, and the burst property is reduced. The recording area of the disk-shaped recording medium can be used with high efficiency by minimizing the replacement area of the defective sector of the high-density disk-shaped recording medium in which recording / reproducing errors easily occur.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an example of a disc-shaped recording medium including a magnetic recording type recording medium, a defect replacement method and a recording / reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings. I will explain it.

FIG. 1 shows a physical format of a recording surface of an optical disk recording medium recorded by a recording / reproducing apparatus according to the present invention. An optical disk recording medium (hereinafter referred to as an optical disk) is provided with a lead-in area Li from the inner periphery of the disk.
A, a data area DuA, and a lead-out area LoA. In the lead-in area LiA and the lead-out area LoA, management information of recording data on the optical disc including management information for defect management is recorded. User data is recorded in the data area DuA. When one rotation of the disk is one track, each track is divided into a plurality of sectors.

Each sector includes an ID part in which the address of the sector is formatted in advance and a data recording area UD in which data is recorded. The address of the sector recorded in the ID portion is the smallest in the innermost sector, and the ascending address is recorded for each sector.

In this embodiment, the data area DuA is divided into a plurality of zones ZN0 to ZNm (m is an integer), and the number of sectors per track increases from the inner circumference to the outer circumference for each zone ZN. The so-called ZCLV (Zone cV) in which the rotation speed is changed for each zone so that the transfer speed is constant
onstant linear) format. The zone ZN0 and the lead-in area LiA are configured with 8 sectors per track, the zone ZN1 is configured with 9 sectors per track, and the zone ZNm and the lead-out area LoA are configured with 16 sectors per track.

FIG. 2 shows a logical format of the recording surface of the optical disk shown in FIG. Lead-in area LiA
Is a DMA1 in which management information for defect management is recorded.
(Defect Management Area 1) and DMA2. The data area DuA includes a plurality of zones ZN.
0 to ZNm. Each zone ZN is divided into a data sector area ADS for recording user data and a spare sector area ASS for use as a substitute sector when a defective sector occurs.

The lead-out area LoA is divided into two areas, DMA3 and DMA4, in which management information for defect management is recorded. In the DMA1, DMA2, DMA3, and DMA4, the same information is recorded in the main defect list PDL and the sub defect list SDL, respectively, in order to improve reliability. In the main defect list PDL, addresses PDSA0 to PDSAn (n is an integer) of defective sectors, which are defect management information for a slipping method described later, are recorded in ascending order. The sub-defect list SDL includes defect sector addresses SDSA0 to SDSap (p is an integer), which is defect management information for a linear replacement method described later.
And a list of addresses SSSA0 to SSSAp of alternative sectors are recorded in ascending order.

As a countermeasure against the above-mentioned burst recording / reproducing error, the interleave length of the error detection / correction code is increased on the optical disk thus formatted, and the burst error is dispersed with respect to the error detection / correction code. It is effective to improve the reliability of data reproduction by making the error equivalent to a general error. For example, in an optical disk recording medium used for recording and reproducing digital compressed image data, one sector of user data is set to 2 KB, and 16 sectors constitute one error detection and correction code.
Increase the interleaving of error detection and correction. That is,
The entire 32 KB user data is subjected to double error detection and correction coding in the row and column directions, and a total of about 38 KB of data including parity of the error detection and correction code constitutes one coded data. To make the interleave length deeper.

In an optical disk recording medium capable of recording and reproduction (hereinafter referred to as a RAM disk), a read-only optical disk recording medium (hereinafter referred to as RO disk) in which data is recorded in advance.
The user records data using a recording device (hereinafter referred to as a drive) instead of performing only reproduction as in the case of an M disk. For this reason, the recorded data cannot always be completely recorded for the above-mentioned reason. That is, defects during or after the manufacture of the medium itself, bending of the medium, fluctuations in positional accuracy in the apparatus, or
It is generally difficult to guarantee normal data recording in all sectors due to dust, dust, and the like.

For this reason, the drive must have a defect replacement function of performing read verify processing for reproducing recorded data and confirming that the data can be normally reproduced, and replacing a different recording area when a write failure is detected. Is common. In this case, the unit of the substitution process is a unit of the error detection and correction code because the determination of the writing failure is basically performed in the process of decoding the error detection and correction code at the time of reproduction. For example, in an MO disk which is a magneto-optical recording medium for recording code data, defect replacement processing is performed in units of one sector corresponding to 512B or 1 KB of user data of an error detection and correction code.

As described above, in the method in which the error detection and correction code is used as a unit of the defect replacement processing, it is necessary to replace and record all the one error detection and correction code for one write failure, and the interleave is deep. When an error correction code is used, a large number of alternative areas must be prepared in advance as spares, and the effective use rate of the recording area in the recording medium may be impaired. For example, RAM
If the above 16 sectors are used as a unit of one error detection and correction code in a disk or the like, because of a writing defect of one sector,
All 16 sectors need to be replaced, and in the worst case, a replacement area of 16 sectors is required for each failure of one sector. Therefore, in the present invention, as will be described in detail with reference to FIGS. 3 to 15, in order to minimize the substitute area for one write failure and improve the efficient use of the recording medium, an error is detected. A detection correction encoding method and apparatus are further provided.

FIG. 3 shows the relationship between error detection and correction coded data and sectors according to the present invention. Coded data of one error detection / correction code is divided and recorded in a data recording area UD of 16 sectors. As described above, address information is recorded in the ID section in advance, and user data is recorded in the data recording area UD.

FIG. 4 schematically shows a method of interleaving an error detection and correction code according to the present invention. The left half of the figure shows the configuration of the error detection and correction code, and the right half shows the configuration in which the error detection and correction code is interleaved and divided into 16 sectors as shown in FIG. I have.

First, in the configuration of the error correction code in the left half part, reference numeral 3 denotes each of 2 KB user data to which CRC for error detection, control data for copyright protection and the like are added. Approximately 3 of 2KB Data0 to Data15
It is 2 KB data and is arranged in a matrix of 172 bytes in the row direction and 192 bytes in the column direction. 4 is an error detection / correction coding of data 3 in the row direction, and a 10-byte parity is added to each row to form C1-
C1 parities from 0 to C1-15. 5 is a C2 configured by error detection / correction coding of data 3 in the column direction and adding a 16-byte parity for each column.
These are C2 parities from −0 to C2-15.

As described above, about 32 KB of data is lined,
And a product code that performs error detection and correction coding in both directions of the column and the column. In addition, each of the error detection and correction codes in the row and column directions uses a Reed-Solomon code, and a sufficient interleave length of about 38 KB is secured when parity is included.
It is effective for both burst errors and has a highly reliable error correction format.

Next, in the configuration of the interleaved error detection and correction code in the right half, data 3 is
It is divided into 16 rows in the row direction from a0 to Data15. C1 parity 4 is divided into 16 rows in the row direction from C1-0 to C1-15, and C2 parity 5 is divided into C2-0.
To C2-15 in the row direction. Further, each of the divided data 3, the C1 parity 4, and the C2 parity 5 constitute recording data of one sector. The recording data of one sector is recorded in the data recording area UD of 16 sectors in the m-row direction.

That is, the first sector includes the first row of Data0, the first row of C1-0, the second row of Data0, and the first row of Data1.
−0, 2nd line,..., Data0, 12th line, C1-
Record C2-0 on line 12 of 0. In the second sector, the first row of Data1, the first row of C1-1,
The second line of Data1, the second line of C1-1,..., Da
The twelfth line of ta1, the twelfth line of C1-1, and C2-1 are recorded. Similarly, each data is recorded in the same manner. In the 16th sector, the first row of Data15, the first row of C1-15, the second row of Data15, the second row of C1-15,.
., The twelfth line of Data15, the twelfth line of C1-15,
Record C2-15.

As described above, in this embodiment, 32K
The product data of the B user data is coded and divided and recorded in 16 sectors.

FIG. 5 shows a configuration in which the recording / reproducing apparatus according to the present invention is applied to an optical disk.
Optical disk 8, disk motor 9, optical head 10, laser drive circuit 11, modem 12, error detection and correction unit 1
3, RAM 14, I / F unit 15, amplifier / binarizer 1
6, focus tracking controller 17, and control CP
U18. The disk motor 9 rotates the optical disk 8. The optical head 10 includes an optical lens and a semiconductor laser, and reads and writes data from and on the optical disk 8. The laser drive circuit 11 drives the laser of the optical head 10. The modulator / demodulator 12 digitally modulates data into a form suitable for recording at the time of recording, and performs demodulation at the time of reproduction. The error detection and correction unit 13 performs error detection and correction encoding on data at the time of recording, and decodes encoded data at the time of reproduction to perform error detection and correction. The RAM 14 is used as a work buffer for the error detector / corrector 13 and as a data buffer. The I / F unit 15 has an external input terminal Ti and an output terminal T.
Via o, the interface 15 controls the interface with the host computer. The amplifier / binarizer 16 amplifies and binarizes the reproduced signal. The focus tracking controller 17 causes the optical head 10 to follow the target track and converge the laser light on the recording surface.

The control CPU 18 is a control device for controlling the entire optical disk recording / reproducing apparatus, and includes a target address deriving unit 31, a reproducing controller 32, a command controller 33 for interpreting commands, a recording controller 34, and a sector. It consists of an alternative processor 35. The destination address deriving unit 31 finally obtains a sector address for recording or reproducing.
The reproduction controller 32 reproduces data from the sector. The command controller 33 that interprets commands and the like interprets commands from the host computer. Recording controller 34
Performs recording control for recording data in a sector.
When a defective sector occurs at the time of recording, the sector replacement processor 35 performs replacement recording in sector units. Control CPU 18
Is preferably configured by a microcomputer or the like, and the function of each unit can be configured by software.

The operation of recording data in the optical disk recording / reproducing apparatus configured as described above will be briefly described below. The user data S19 sent from the host computer is temporarily stored in the RAM 14 serving as a working buffer of the error detection and correction unit 13 via the I / F controller 15. The user data S19 corresponds to each of Data0 to Data15 described with reference to FIG. The error detection and correction unit 13 performs row-direction coding, that is, C1 coding, and column-direction coding, that is, C2 coding, and generates a C1 parity 4 and a C2 parity 5. On the other hand, the control CPU 18 specifies a target track to the focus tracking controller 17. The focus tracking controller 17 moves the optical head 10 to a target track. The light beam emitted from the optical head 10 is reflected by the optical disk 8 and becomes reproduction light, which is sent to the amplifier / binarizer 16.

The reproduction light is modulated by uneven pits in an ID portion in which address information is recorded in advance. Also, the reproduction light is transmitted in a data recording area UD where data is recorded.
It is modulated as a change in the amount of light reflected by the recording mark.
The modulated reproduced light is converted into a reproduced binary signal S20 by the amplifier / binarizer 16, and sent to the modem 12. The modulator / demodulator 12 converts the reproduced binary signal S20 from
The address of the target sector is detected, and the coded data S21 sent from the error detection and correction unit 13 is digitally modulated.
The digitally modulated data S22 is sent to the laser drive circuit 11, and the intensity of the laser is changed according to the modulated data 22, so that the data is recorded in the data recording area UD of the target sector on the optical disk 8. In the encoding of the error detection and correction code, the data of 16 sectors is the minimum unit, but the recording of the data has a unique address for each sector, so that the recording of the sector unit is possible. .

Next, the operation of reproducing data will be briefly described. When reproducing data, the control CPU 18 sets the target track of reproduction to the focus tracking controller 17.
To send to. The focus tracking controller 17 causes the light beam from the optical head 10 to follow the target track.
As in the case of recording, the reproduced binary signal 20 is generated from the reflected light of the optical disk 8, and the target sector is detected by the modem 12. The modulator / demodulator 12 digitally demodulates the reproduced binary signal 20 obtained from the data recording area of the target sector and sends it to the error detection and correction unit 13 as reproduced data. The error detection / correction unit 13 outputs 16 data from the modem 12.
After the sectors have been sent, the error detection and correction operation is started. That is, decoding of the C1 and C2 error correction codes is repeatedly performed, decoding is performed as far as the correction capability is limited, and a reproduction error caused by dust or the like attached to the recording surface of the optical disk 8 is corrected. The corrected data is sent to the host computer via the I / F controller 15.

All the above operations are executed as a series of operations under the control of the control CPU 18. FIG.
In the above description, description of components such as a timing control circuit which can be used in common with each device used in a conventional recording / reproducing device for an optical disk recording medium is omitted.

FIG. 6 schematically shows an alternative process when the present invention is applied to a sector replacement process of the linear replacement system. In the linear replacement system, as described with reference to FIG. 2, data is recorded in a data sector area ADS created for each zone ZN, and data to be recorded in a defective sector is replaced with a spare data spare sector. It is recorded in the area ASS. It is assumed that one error detection and correction encoded data is recorded in 16 sectors S0 to S15. It is determined whether or not the recording was normal based on whether or not the address reproduction at the time of recording is defective or verify processing, that is, whether or not the data is reproduced after the data is recorded and reproduced correctly. As a result of the determination, the sector S2
Is a recording failure, that is, a defective sector.

In this case, instead of replacing all 16 sectors which are units of the error detection and correction code, only the data D2 to be recorded in the defective sector S2 is replaced with the spare sector area A.
The information is recorded in, for example, the alternative sector AS1 of the SS. In the subsequent recording and reproduction, the substitute sector AS1 is always used instead of the defective section S2. Such a method of continuously recording the substitute data is referred to as a linear replacement method. As described above, in the present embodiment, instead of collectively replacing the 16 sectors which are the units of the error correction code, the replacement sector processing is performed in units of sectors, so that even when a defective sector occurs, one sector of the defective sector is generated. On the other hand, since only one alternative sector is required, the number of sectors to be prepared as alternative sectors can be reduced, and the optical disk can be used efficiently.

Next, the recorded data is reproduced immediately after, and a verifying process for judging whether or not the data has been correctly recorded,
Subsequently, an alternative method based on the linear replacement method in the present embodiment will be described. Data is recorded as described above. The recorded data is stored in RAM 1 until the following verification process is completed.
4 The data reproduction in the verification process differs from the normal reproduction operation described above in the operation of the error detection and correction unit 13. In the case of the reproduction in the verification process, the error detection / correction unit 13 can decode only the data of the same sector when decoding the reproduction data sent from the modem 12, so that only the C1 code is decoded. C1 code is 1
Since this is a Reed-Solomon code to which 0-byte parity is added, it is possible to correct up to 5 bytes at an arbitrary position in the code word. Here, for example, the correction operation is limited to 3 bytes, and errors exceeding this are limited. If it is detected, it is determined that the recording is defective. Since the C1 code is coded in the row direction, when an error exceeding 3 bytes is detected, a sector can be uniquely specified. A sector in which at least one error exceeding 3 bytes exists is determined to be a defective recording sector, and an error occurs in the ID portion during recording, and
Sectors for which address information has not been detected are collectively subjected to the following sector replacement processing as defective sectors.

In the sector replacement process, the control CPU 18
When the error detection / correction unit 13 reports the detection of a recording failure sector, the address of an unused alternative sector in the spare sector area ASS is determined. The target track is derived from the address of the determined alternative sector, and the target track is designated to the focus tracking controller 17 in the same manner as in the above recording,
Thereafter, the data recording operation is performed. In the case of recording of the replacement sector, only the data of the defective sector is recorded, and the recording operation is performed in sector units. At this time,
Information related to the defective sector and the replacement sector is recorded as map information in another replacement management sector. As described above, by performing the replacement sector processing in units of sectors, even when a defective sector occurs, a plurality of replacement sectors, which are units of error correction codes, are not required for one defective sector. 1 for a defective sector
It is only needed by the sector replacement sector. As a result, as described above, the number of sectors to be prepared as substitute sectors can be reduced, and the optical disk can be used efficiently.

FIG. 7 schematically shows an alternative process when the present invention is applied to a sector replacing process of the slipping system.
Even in the slipping method, data is recorded in a data sector area ADS provided for each zone ZN.
Data to be recorded in the defective sector is recorded in the data sector area ADS following the defective sector. That is, in the slipping method, the data sector area ADS includes a data sector area (ADS) and a spare sector area (ASS) in the linear replacement method.
Can be viewed as a combined area.

In the slipping method, the data verification processing is the same as that in the linear replacement method, and therefore the sector replacement processing will be briefly described below. It is assumed that one error detection and correction encoded data is recorded in 16 sectors S0 to S15. Now, it is determined whether or not the recording was normal based on the address reproduction failure at the time of recording or the verify process, that is, whether or not the data was reproduced after the data was recorded. That is, it is assumed that the sector is a defective sector. In such a case, in the present embodiment, the recording sector is not shifted by 16 sectors, which is the unit of the error detection and correction code, but the defective sector S2 is used.
The data D2 to be recorded in the sector S3 and the data D3 to be recorded in the sector S3 to S4 are recorded in such a manner that the recording sectors of the sectors subsequent to the defective sector are sequentially shifted one by one. Then, in the case where data recording / reproduction is performed later, the alternative sector processing of the slipping method of always skipping and using the defective sector S2 is performed.

As described above, in this embodiment, 16 sectors, which are units of the error correction code, are not skipped all at once, but are skipped in sector units. That is, only one alternative sector is required for one defective sector. As a result, the number of sectors to be prepared as substitute sectors can be reduced, and the optical disk can be used efficiently. If the data sectors in the data sector area ADS become insufficient due to the slipping of the substitute sector, the data can be recorded shifted to the spare sector area ASS area of the linear replacement system.

In the case of the slipping method, even when a defective sector is replaced, the data sector area AD is used when recording and reproducing data as in the linear replacement method.
Moving the optical head 10 in the S spare section area ASS,
There is no need to perform a so-called seek operation, and there is a characteristic that performance does not deteriorate. However, there is a restriction that the subsequent sector is unused, so in implementation, the slipping method and the linear replacement method are combined, that is, when recording for the first time after the disk is initialized, the alternative sector processing of the slipping method is performed. It is desirable to perform the alternative sector processing of the linear replacement method for the subsequent recording.

In the linear replacement method and the slipping method, only the correction process of the C1 code is performed to determine the defective recording sector. In the case where an error detection code such as a CRC code of No. 3 is further inserted, this CRC can be decoded only by data in the sector. Therefore, after correcting the C1 code, error detection by the CRC code is performed. A defective recording sector may be determined based on the detection result.

As described above, according to the present invention, in both the linear replacement and the slipping, the defect correction is performed by performing the alternate sector processing on the error correction code unit of 16 sectors on a sector basis. Even if a sector occurs, the disk can be used efficiently by consuming only a few alternative sectors.

Referring to FIG. 8, the operation of the optical disk recording / reproducing apparatus according to the present invention shown in FIG. 5 will be described. First, the user instructs the host computer to write data to the optical disk 8 using an appropriate input means such as a keyboard.

In step # 100, the control CPU 18 interprets the command sent from the host computer via the input terminal Ti and determines whether the processing content is recording or reproduction. If the command is recording, the process proceeds to step # 200, while if the command is reproduction, the process proceeds to step # 800.

In step # 200, the I / F controller 1 receives the data to be recorded from the host computer.
After receiving the recording data S19 by controlling the step No. 5, the process proceeds to the next step # 300.

In step # 300, the main defect list PD
After deriving the target address for deriving the address of the sector to be finally recorded based on L and the sub-defect list SDL, the process proceeds to the next step # 400. The details of this step will be described later in detail with reference to FIG.
In other words, as described with reference to FIG. 2, the defective sector addresses PDSA0 to PDSA0 included in the main defect list PDL are used.
Detect the defective sector addresses SDSA0-SDSAp and the substitute sector addresses SSSA0-SSSAp included in the SAn and the sub-defect list SDL.

In step # 400, step # 300
After the data is recorded in the sector of the target address derived in the above, the process proceeds to the next step # 500. However, the data recorded in this step # 400 is stored in the subsequent step # 50.
The data is stored in the RAM 14 until all the processes in 0, # 600, and # 700 are completed. The operation of this step will be described later in detail with reference to FIG.

At step # 500, it is checked whether or not the recorded sector can be correctly reproduced, that is, after verifying the recorded data, the process proceeds to the next step # 600. The data reproduction control of the error detector / corrector in the verifying process step is different from that during normal data reproduction.
That is, when decoding the reproduction data sent from the modem 12, the error detection and correction unit 13 can decode only the data of the same sector, and therefore only decodes the C1 code.

In step # 600, step # 400
As a result of the verification process, it is determined whether or not the recording has been normally performed on the recording target sector. Since the C1 code is a Reed-Solomon code to which a 10-byte parity is added, up to 5 bytes can be corrected at any position in the code word. However, in this step, for example, the correction operation is limited to 3 bytes, and if an error exceeding this is detected, it is determined that the recording is defective. That is, a sector in which at least one error exceeding 3 bytes exists is determined to be a defective recording sector, and a sector in which an error has occurred in the ID portion and no address information has been detected during recording is also regarded as a defective sector. Is determined. If recording cannot be normally reproduced from the target sector due to verification, YE
S, that is, it is determined that the target sector is a defective sector, and the flow advances to step # 700.

In step # 700, the sector replacement processing is performed by the slipping method or the linear replacement method as described above, and the processing is terminated. The operation in each of the slipping method and the linear replacement method will be described later in detail with reference to FIGS.

On the other hand, NO in step # 600, that is, it is determined that the target sector is not a defective sector, and the process ends.

If it is determined in the first step # 100 that the command is a reproduction command, the process proceeds to step # 80.
0, the address of the sector to be finally reproduced is derived in the same manner as in step # 300, and then the process proceeds to the next step # 1000. That is, the defective sector addresses PDSA0 to PDSAn included in the main defect list PDL and the defective sector addresses SD included in the sub-defect list SDL
SA0 to SDSAp and alternative sector address SSSA0
The address of the sector to be accessed in the reproduction order is derived based on the SSSAp.

In step # 1000, step # 80
After reproducing the data from the sector of the target address derived at 0, the process proceeds to the next step # 1100. The operation of this step will be described in more detail later with reference to FIG. In step # 1100, after controlling the I / F controller 15 to transfer the reproduction data to the host computer, the process ends.

Referring to FIG. 9, a detailed operation of control CPU 18 in reproduction control step # 1000 shown in FIG. 8 will be described. In step S1002, the focus tracking controller 17 is controlled to perform a search seek for moving the optical head 10 to the target track to which the target sector for reproduction belongs, and then the process proceeds to the next step S1004. In the search seek, the focus tracking controller 17 is controlled to move the optical head 10 to the target track to which the target sector belongs, and to cause the light beam to follow the target track.

In step S1004, the address recorded in the ID portion of the sector is reproduced by the modem 12 and compared with the address of the target sector.
After detecting the target sector, the process proceeds to the next step S1006. Specifically, the detection of the target sector is performed by causing the modem 12 to match and compare the address of the target sector with the address reproduced from the ID portion of the disk.

In step S1006, data is reproduced from the data recording area UD of the detected target sector and digitally demodulated, and the flow advances to the next step S1008. The reproduction data digitally demodulated from the modulator / demodulator 12 is sent to the error detection / correction unit 13.

In step S1008, the error detection / correction unit 13 is controlled to correct an error caused by a defect, dust, or the like on the disk 8, and then the process ends. That is, the error detection and correction code is decoded, error correction processing is performed, and the corrected data is stored in the buffer RAM 14.

Referring to FIG. 10, the operation of control CPU 18 in recording control step # 400 shown in FIG. 8 will be described. In step S402, the focus tracking controller 17 is controlled to move the optical head 10 to the target track to which the target sector for recording belongs, to perform a search seek, and then proceed to the next step S404. In the search seek, the focus tracking controller 17 is controlled to move the optical head 10 to the target track to which the target sector belongs, and follow the light beam on the daily track.

In step S404, the error detector / corrector 1
3 and the error detection and correction coding for forming a product code by doubly error correction coding the recording data of 16 sectors into one block, and then proceed to the next step S406. At the time of this error detection and correction encoding, the recording data sent from the host computer is processed by the error detection and correction circuit 13.
The error detection / correction code is encoded, and the encoded data is stored in the buffer RAM 14.

In step S406, the address recorded in the ID portion of the sector is reproduced by the modem 12, and the address is compared with the address of the target sector.
After detecting the target sector, the process proceeds to the next step S408.

In step S408, the data subjected to the error detection / correction coding is digitally modulated by the modulator / demodulator 12, and data modulation recording for recording in the data recording area UD of the detected target sector is performed, followed by terminating the process.

Referring to FIG. 11, the operation of control CPU 18 in target address deriving step # 300 shown in FIG. 8 will be described. In step S310, the main defect list PDL multiplexed and recorded in the lead-in area LiA and the lead-out area LoA is reproduced, and the buffer RAM 1
4 and then proceed to the next step S320.

In step S320, an address conversion by the slipping method is performed based on the contents of the reproduced main defect list PDL, and the address LADR requested by the host is obtained.
Sector dress PADR based on main defect list PDL
Is derived, and the process proceeds to the next step S330.

In step S330, the lead-in area L
The sub-defect list SDL multiplexed recorded in the iA and the lead-out area LoA is reproduced and stored in the buffer RAM 14, and then the process proceeds to the next step S340.

In step S340, an address conversion is performed by the linear replacement method from the contents of the reproduced sub-defect list SDL, and a final recording or reproduction target address TADR is derived from the PADR address, and then the processing is terminated.

Referring to FIG. 12, the operation of control CPU 18 in step S320 of performing address conversion by the slipping method based on the PDL shown in FIG. 11 will be further described. In step S321, the address of the predetermined leading sector of the zone ZN to which the sector whose address is LADR belongs is assigned to ZADR, and then the next step S323
Proceed to. That is, the head address of the zone to which the sector whose address is LADR belongs is set to ZADR. still,
ZADR is uniquely defined for each zone as a predetermined format.

In step S323, the main defect list PD
L among the addresses of defective sectors registered in ZA.
The number q of addresses equal to or larger than DR and equal to or smaller than LADR
After deriving the number q of defective sectors that counts (q is an integer), the process proceeds to the next step S325. That is, if the address is LAD
The number q of defective sectors occurring in the zone up to the sector R
Is derived. In order to perform sector slipping on a sector-by-sector basis, LADR sectors are shifted by the number q of defective sectors due to slipping.

In step S325, it is determined whether or not the number q of defective sectors is zero. If the number q of defective sectors is not 0, that is, if a defective sector has occurred, the determination is NO, and the process proceeds to step S327. That is, the number of defective sectors q
, It is determined whether or not it is necessary to convert the LADR due to the occurrence of slipping.

In step S327, LAD is added to ZADR.
After substituting LADR + q for R + 1 and LADR, the process returns to step S323. That is, in order to check whether or not a defective sector has occurred between LADR + q sectors shifted from the original LADR sector, ZADR sets ZADR.
DR + 1 is substituted, and LADR is substituted with LADR + q. Then, the processes after the defective sector deriving step S323 are repeatedly executed until it is determined in step S325 that q = 0.

On the other hand, if it is determined in step S325 that N0, that is, the number q of defective sectors is 0, that is, the number of defective sectors has not occurred, the process proceeds to step S329. In step S329, the process ends after LADR is substituted for PADR. That is, since no defective sector has occurred at q = 0, LAD is added to PADR.
R is substituted as it is, and the processing ends.

Referring to FIG. 13, the operation of control CPU 18 in step S340 for performing address replacement of the linear replacement method based on the SDL shown in FIG. 11 will be described. In step S341, the sub defect list SD
It is determined whether the same address as the PADR converted based on the main defect list PDL is registered among the addresses of the defective sectors registered in L. If NO, that is, if it is determined that it has not been registered, the process proceeds to step S345.

In step S345, the process ends after PADR is directly substituted for the target sector address TADR for recording / reproduction.

On the other hand, if it is determined in step S341 that the address of the corresponding PADR is registered as a defective sector in the YBS, that is, the SDL, the flow advances to step S343. In S343, the process ends after replacing the address of the corresponding alternative sector with TADR.

Referring to FIG. 14, the operation of control CPU 18 when sector replacement processing step # 700 shown in FIG. 8 is performed by the slipping method will be described. Step S701
Then, after performing the slipping recording in which the data of the defective sector is slipped and recorded to the next sector, the process proceeds to the next step S703. That is, when the sector replacement process is performed on a sector-by-sector basis by the slipping method, the data of the defective sector is replaced and recorded in the sector next to the defective sector.

In step S703, the data in the slip-recorded sector is reproduced again to perform a verify process to confirm that the data has been correctly recorded, and then the flow advances to the next step S705. The verification process performed in this step is the same as that performed in step # 500 in FIG.

Step S705 is a defective sector determining step of determining whether the slip-recorded sector is a defective sector again, and is the same as that performed in step # 600 of FIG. If slip recording has been normally performed, it is determined as NO, and step S707 is performed.
Proceed to.

In step S707, after the address of the newly generated defective sector is additionally registered at the end of the PDL, the flow advances to the next step S709. In step S709, the updated PDL is stored in DMA1, DMA2, DMA3,
After the multiplexed recording in the DMA4, the process ends.

On the other hand, in step S705, if the slip recording has not been properly performed, it is determined to be YBS, and the process returns to step S701. That is, it is determined in the verify processing step S703 and the defective sector determination step S705 whether or not the sector which has been subjected to the alternative recording has been correctly recorded. Until the recording is correctly performed, the slipping recording step S701, the verify processing step S703, and the defective sector determination step S705 are performed. repeat.

If the recording is successful, the address of the newly generated defective sector is additionally registered at the end of the PDL in the PDL registration step S707. Then, finally, in the PDL recording step S707, the updated PDL is stored in the DM of the lead-in area LiA and the lead-out area LoA.
Multiplex recording is performed on A1, DMA2, DMA3, and DMA4.

Referring to FIG. 15, the operation of control CPU 18 when executing section replacement processing step # 700 shown in FIG. 8 by the linear replacement method will be described. In step S711, the data of the defective sector is replaced in the spare zone of the spare sector area ASS having the lowest address in the same zone ZN, and the process proceeds to the next step S713.

In step S713, after verifying that the replacement-recorded sector data has been reproduced and correctly recorded, the process proceeds to the next step S715. The verification process performed in this step is the same as that performed in step # 500 in FIG.

Step S715 is a defective sector determination step for determining whether the replacement-recorded sector is a defective sector again. Step # 600 in FIG.
It is the same as that implemented in. If the replacement recording has been successfully performed, NO is determined, and the process proceeds to step S716.

In step S 716, the address of the defective sector to be recorded first and the address of the corresponding alternative sector are paired and inserted into the sub-defect list SDL in ascending order by the address of the defective sector.
Proceed to.

In step S718, the updated sub-defect list SDL is stored in DMA1, DMA2, DMA3, and DM3.
After multiplexed recording on A4, the process is terminated.

When performing the sector replacement process in units of sectors by the linear replacement method, the control CPU 18 replaces the data of the defective sector with an unused replacement sector in a replacement recording step S711. Next, it is determined whether or not the alternately recorded sector has been correctly recorded by verify processing step S713 and defective sector determination step S7.
The determination is made in step 15 and the replacement recording step S711 and the verify processing step S7
13. The defective sector determination step S715 is repeated. If the recording is successful, the address of the defective sector to be recorded first and the address of the corresponding alternative sector are finally paired by the SDL registration step S716.
After insertion into the SDL in ascending order at the address of the defective sector, the process is terminated. Finally, the SDL recording step S718
Then, the updated sub-defect list SDL is stored in the lead-in area Li.
A and DMA1, DMA2, D of the lead-out area LoA
Multiplex recording is performed on MA3 and DMA4. In this way, in the slipping method and the linear replacement method, the replacement process of consuming one replacement sector for one defective sector is performed.

[0087]

As described above, the disk-shaped recording medium recording apparatus and the disk-shaped recording medium recording method according to the present invention provide a high-density disk-shaped recording medium with a defective recording sector where burst recording and reproduction errors are likely to occur. The recording area of the disc-shaped recording medium can be used with high efficiency while minimizing the substitution area.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a state of a recording surface of an optical disc recording medium according to the present invention.

FIG. 2 is a schematic diagram showing a logical structure of a recording area of the optical disc recording medium shown in FIG.

FIG. 3 is a schematic diagram showing the relationship between encoded data for error detection and correction and sectors according to the present invention;

FIG. 4 is a schematic diagram showing a method of interleaving an error detection and correction code according to the present invention.

FIG. 5 is a block diagram showing a configuration of an optical disk recording medium recording / reproducing apparatus according to the present invention.

FIG. 6 is a schematic diagram illustrating a process of replacing a defective sector according to the first embodiment of the present invention.

FIG. 7 is a schematic diagram illustrating a replacement process of a defective sector according to the second embodiment of the present invention.

8 is a flowchart showing the operation of the optical disk recording medium recording / reproducing apparatus shown in FIG.

9 is a flowchart showing a detailed operation of a reproduction control step shown in FIG.

FIG. 10 is a flowchart showing a detailed operation of a recording control step shown in FIG. 8;

FIG. 11 is a flowchart showing a detailed operation of a destination address deriving step shown in FIG. 8;

12 is a flowchart showing a detailed operation of an address conversion step based on the PLD shown in FIG.

FIG. 13 is a flowchart showing a detailed operation of an address translation step based on the SDL shown in FIG. 11;

FIG. 14 is a flowchart showing a detailed operation based on the first embodiment of the sector replacement processing step shown in FIG. 8;

15 is a flowchart showing a detailed operation based on a second embodiment of the sector replacement processing step shown in FIG. 8;

[Description of Code] 8 Disc-shaped recording medium 10 Optical head 11 Laser drive circuit 12 Modulator / demodulator 13 Error detection / correction device ADS First recording area ASS Second recording area LiA, LoA First address recording area PDL, SDL First Second address recording area 31 Alternative sector address detection means 32 Reproduction control means

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 20/18 572 G11B 20/18 572C 572F H03M 13/29 H03M 13/29 (72) Inventor Nohisa Fukushima Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Shunji Ohara 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Denki Sangyo Co., Ltd.

Claims (7)

[Claims] 1. A disk having a plurality of recording sector structures by generating double-ended error detection and correction codes in the row and column directions to generate product code data as a unit of error detection and correction code. A disc-shaped recording medium recording apparatus for recording on a disc-shaped recording medium, encoding means for dividing the product code data into a predetermined number in a sector unit size; and a disc-shaped recording medium for dividing the divided product code data. Means for recording in each of the sectors on the first recording area, and means for reproducing the sector to determine whether or not the sector is a defective sector on a sector-by-sector basis. If it is determined that there is a defective sector, only the defective sector is skipped, the product code data to be recorded in the sectors subsequent to the defective sector is sequentially slipped one sector at a time, and the predetermined number and the defective First alternative means for recording data in a plurality of sectors including the number of data, and second alternative means for performing a linear replacement by alternately recording data to be recorded in a defective sector in a sector in the second recording area. When recording on the disk-shaped recording medium for the first time, the first alternative means is used. 2. The disk-shaped recording medium recording apparatus according to claim 1, wherein the second alternative means is used for recording after the first alternative means is used. 3. The defective sector determining unit according to claim 2, wherein the defective sector determining unit determines that the sector is a defective sector if the pre-recorded address information of the sector cannot be correctly reproduced. Disc-shaped recording medium recording device. 4. The disk-shaped recording medium according to claim 2, wherein said defective sector discriminating means decodes only an error detection / correction code that can be decoded only by data recorded in said sector. Recording device. 5. The disk-shaped recording apparatus according to claim 3, wherein said defective sector determination means determines that said sector is a defective sector when data recorded in said sector cannot be correctly reproduced. Medium recording device. 6. A disk having a plurality of recording sector structures by double-error-correction-encoding data in the row and column directions to generate product code data as a unit of the error-correction code. A disc-shaped recording medium recording method for recording on a disc-shaped recording medium, wherein the product code data is divided into a predetermined number in units of sectors and encoded, and the divided product code data is recorded on the disc-shaped recording medium. By recording in each of the sectors on the first recording area and reproducing the sector, it is determined whether the sector is a defective sector on a sector-by-sector basis. If the sector is determined to be a defective sector, Skipping only the defective sector, sequentially slipping the product code data to be recorded in sectors subsequent to the defective sector one sector at a time, and allocating an area of a plurality of sectors obtained by adding the predetermined number and the defective sector number. Use A first alternative method of recording data to be recorded in a defective sector in a sector on a second recording area, and a second alternative method of performing linear replacement. A recording method for a disk-shaped recording medium, wherein a first alternative method is used for recording. 7. The recording method according to claim 6, wherein the second alternative method is used for recording after the first alternative method is used.