Recording defect substitution method for a disc-shaped recording medium, and a recording and reproducing apparatus for a disc-shaped recording medium

Abstract

In a recording and reproducing apparatus for a disc-shaped recording medium, and a defect substitution method for a disc-shaped recording medium (8), whether reproduction of recorded data is good is determined by sector unit and not by product code unit, defective sector discrimination is performed by sector unit, and only sectors determined defective are alternately recorded, when using a recording format in which data that is error detection and correction coded with a product code is segmented and recorded to a plurality of sectors.

Description

This q m, which is the number q m (where q m is an integer) of sectors in the list of defective sector addresses stored to the primary defect list PDL with an address greater than or equal to ZADR and less than or equal to LADR, is determined in step S323, and the procedure steps to step S325. More specifically, the number q m of defective sectors in the related zone up to the sector of address LADR is determined. As a result, the sector of address LADR is offset the number q m of defective sectors by the sector unit slipping operation.

At step S325, it is determined whether the defective sector count q m is 0. If the defective sector count q m is not 0, that is, if defective sectors are present, a no is returned and the procedure steps to step S327. That is, it is determined, based on the value of the defective sector count q m, whether LADR conversion due to sector slipping is necessary.

At step S327, LADR+1 is substituted for ZADR, LADR+q m is substituted for LADR, and the procedure retunes to step S323. That is, ZADR+1 is substituted for ZADR, and LADR+q m is substituted for LADR, for determining whether a defective sector is present between the sector at address LADR and the offset sector at LADR+q m. The steps following the defective sector detection step S323 are then repeated until at step S325 q m=0.

However, if step S325 returns no, that is, the defective sector count q m is 0 and it is thus determined that there are no defective sectors, the procedure steps to step S329.

At step S329, LADR is substituted for PADR, and the procedure ends. More specifically, LADR is directly substituted for PADR because there are no defective sectors as determined by q m=0.

The operation of the control CPU 18 in the linear replacement method address conversion step S340 based on the SDL shown in FIG. 11 is described next with reference to FIG. 13.

In step S341, it is determined whether an address matching the PADR address converted according to the primary defect list PDL is stored in the defective sector addresses stored to the secondary defect list SDL. If the result is no, that is, if the same address is not stored in the secondary defect list SDL, the procedure steps to step S345.

At step S345, the PADR address is directly substituted for the recording and reproduction target sector address TADR, and the procedure ends.

If step S341 returns yes, that is, if the PADR address is recorded as a defective sector address in the SDL, the procedure steps to step S343.

At step S343, the corresponding alternate sector address is substituted for TADR, and the procedure ends.

The operation of the control CPU 18 when the sector substitution process step #700 in FIG. 8 is applied using the slipping method is described next with reference to FIG. 14.

At step S701, the data stored to the defective sector is shifted to the next sector and recorded in a slipping recording operation, and the procedure steps to step S703. That is when the sector substitution process is performed in sector units using the slipping method, the data from the defective sector is alternately recorded to the next sector after the defective sector.

The verification process performed in step S703 reproduces the data recorded to the slip-recorded sector to confirm that the data is correctly recorded, and then the procedure steps to step S705. Note that the verification process performed in this step is the same as that performed in step #500 in FIG. 8.

Step S705 is a defective sector discrimination step whereby it is determined whether the sector to which data is shifted from a defective sector by the slipping method is itself a defective sector. As such, the operation of step S705 is the same as that of step #600 in FIG. 8. A no is returned when the sector is normally recorded by the slipping method, and the procedure steps to step S707.

The address of a newly detected defective sector is appended to the end of the PDL in step S707, and then the procedure steps to step S709.

The updated PDL is then multi-recorded to DMA1, DMA2, DMA3, and DMA4 in step S709, and the procedure ends.

If at step S705 a yes is returned because the sector was not normally recorded by the slipping method, the procedure loops back to step S701. In other words, whether the alternatively recorded sector could be correctly recorded or not is determined by the verification process step S703 and the defective sector discrimination step S705, and the slip recording step S701, verification process step S703, and defective sector discrimination step S705 are repeated until normal recording is successfully confirmed.

If the sector is normally recorded, the address of any newly occurred defective sector is appended to the end of the PDL in the PDL registration step S707. The PDL updated in the PDL registration step is then recorded multiple times, that is, to the DMA1, DMA2, DMA3, and DMA4 of the lead-in area LiA and lead-out area LoA.

The operation of the control CPU 18 when the sector substitution process step #700 in FIG. 8 is applied using the linear replacement method is described next with reference to FIG. 15.

At step S711, the data stored to the defective sector is replacement recorded to an alternate sector in the spare sector area ASS at the lowest unused address in the same zone ZN, and the procedure steps to step S713.

The verification process performed in step S713 reproduces the data recorded to the replacement recorded sector to confirm that the data is correctly recorded, and then the procedure steps to step S715. Note that the verification process performed in this step is the same as that performed in step #500 in FIG. 8.

Step S715 is a defective sector discrimination step whereby it is determined whether the sector to which data is recorded from a defective sector by the replacement method is itself a defective sector, and is the same as step #600 in FIG. 8. A no is returned when the sector is normally recorded by the replacement method, and the procedure steps to step S716.

At step S716, the address of the defective sector to which recording was first attempted, and the address of the corresponding alternate sector, are inserted as a pair to the secondary defect list SDL in ascending order at the address of the defective sector. The procedure then steps to step S718.

The updated secondary defect list SDL is then multi-recorded to DMA1, DMA2, DMA3 and DMA4 in step S718, and the procedure ends.

When the sector substitution process is implement in sector units using a linear replacement method, the control CPU 18 alternately records the data from the defective sector to an unused alternate sector in the replacement recording step S711. Next, it determines whether the alternately recorded sector was correctly recorded in the verification process step S713 and the defective sector discrimination step S715, and the replacement recording step S711, verification process step S713 and defective sector discrimination step S715 are repeated until normal recording is successfully confirmed.

If the sector is normally recorded, the address of the defective sector to which recording was first attempted, and the address of the corresponding alternate sector, are inserted as a pair to the secondary defect list SDL in ascending order at the defective sector address in the SDL registration step S716, and the procedure ends.

Finally, the updated secondary defect list SDL is recorded multiple times, that is, to the DMA1, DMA2, DMA3, and DMA4 of the lead-in area LiA and lead-out area LoA in the SDL registration step S718.

A substitution process whereby one alternate sector is consumed for one defective sector is thus accomplished using a slipping method and a linear replacement method.

Ability for Application in Industry

As described above, a recording defect substitution method for a disc-shaped recording medium, and a disc-shaped recording medium recording and reproducing apparatus according to the present invention minimize the alternate area for defective sectors in high recording density disc-shaped recording media in which burst-mode recording and reproduction errors occur easily, and can thereby highly efficiently use the recording area of a disc-shaped recording medium.

Claims

1. A recording apparatus for recording data in a disc-shaped recording medium having a plurality of sectors, said recording apparatus comprising:

a coding means for coding the data into error detection and correction coded data aligned in both row and column directions, and segmenting said error detection and correction coded data into a plurality of segment coded data;

means for recording each of said plurality of segment coded data to a sector in a first recording area of the disc-shaped recording medium;

defective sector discrimination means for determining whether a sector is a defective sector by reproducing said segment coded data recorded in said sector; and

defective sector substitution means , for skipping, in the case where said sector is determined to be a defective sector, only the defective sector and for recording said segment coded data in and after the defective sector in following sectors by successively slipping sectors one by one, and for shifting the data for the defective sector and recording the data for the defective sector to a second recording area in the case where there remain no sufficient sectors in the first recording area as a result of the sectors slipping substitution of sectors.

2. The disc-shaped recording medium recording apparatus according to claim 1, wherein the defective sector discrimination means determines a sector to be a detective sector when address information (ID) pre-recorded to said sector cannot be correctly reproduced.

3. The recording apparatus according to claim 1, wherein the defective sector discrimination means determines a sector to be a defective sector by decoding only the error detection and correction coded data, which can be decoded using only data recorded to said sector.

4. The disc-shaped recording medium recording apparatus according to claim 1, wherein the defective sector discrimination means determines a sector to be a defective sector when data recorded to said sector can not be correctly reproduced.

5. A recording method for recording data in a disc-shaped recording medium having a plurality of sectors, said recording method comprising:

coding the data into error detection and correction coded data aligned in both row and column directions;

segmenting said error detection and correction coded data into a plurality of segment coded data;

recording each of said plurality of segment coded data to a sector in a first recording area of the disc-shaped recording medium;

determining whether a sector is a defective sector by reproducing said segment coded data recorded in said sector; and

in the case where said sector is determined to be a defective sector, skipping only the defective sector and recording said segment coded data in and after the defective sector in sectors following sectors by successively slipping sector sectors one by one sector , and shifting the data for the defective sector and recording the data for the defective sector to a second recording area in the case where there remain no sufficient sectors in the first recording area as a result of the sectors slipping substitution of sectors.

6. A recording apparatus for recording data in a disc-shaped recording medium having a plurality of sectors, said recording apparatus comprising:

a coding means for coding the data into error detection and correction coded data aligned in both row and column directions, and segmenting said error detection and correction coded data into a plurality of segment coded data;

means for recording each of said plurality of segment coded data to a sector in a first recording area of the disc-shaped recording medium;

defective sector discrimination means for determining whether a sector is a defective sector by using a defect list which has been prepared by reproducing segment coded data recorded in said sector; and

defective sector substitution means for skipping, in the case where said sector is determined to be a defective sector, only the defective sector and for recording said segment coded data in and after the defective sector in following sectors by successively slipping sectors one by one, and for shifting the data for the defective sector and recording the data for the defective sector to a second recording area in the case where there remain no sufficient sectors in the first recording area as a result of the slipping of sectors.

7. A recording method for recording data in a disc-shaped recording medium having a plurality of sectors, said recording method comprising:

coding the data into error detection and correction coded data aligned in both row and column directions;

segmenting said error detection and correction coded data into a plurality of segment coded data;

recording each of said plurality of segment coded data to a sector in a first recording area of the disc-shaped recording medium;

determining whether a sector is a defective sector by using a defect list which has been prepared by reproducing segment coded data recorded in said sector; and

in the case where said sector is determined to be a defective sector, skipping only the defective sector and recording said segment coded data in and after the defective sector in following sectors by successively slipping sectors one by one, and shifting the data for the defective sector and recording the data for the defective sector to a second recording area in the case where there remain no sufficient sectors in the first recording area as a result of the slipping of sectors.