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PATENT ABSTRACTS OF JAPAN 

(1 OPublication number : 2001-023317 
(43)Date of publication of application : 26.01.2001 



(51)IntCI. 



61 IB 20/18 



(21 Application number : 11-188713 (71)Applicant : NEC CORP 
(22)Date of filing : 02.07.1999 (72)Inventor : ARAI TORU 



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(54) OPTICAL DISK RECORDING AND REPRODUCING METHOD, DEVICE THEREFOR AND 
MEDIUM STORING OPTICAL DISK RECORDING AND REPRODUCING PROGRAM 

(57)Abstract: 

PROBLEM TO BE SOLVED: To provide an optical disk 
recording and reproducing method by which lowering of 
throughput of an optical disk device due to retry 
attendant upon read-out error can be suppressed. 
SOLUTION: When read-out error is generated at the 
time of reading-out data of an address X of the optical 
disk by an optical head part 1, a control part 3 has the 
optical head part 1 retry read-out of the address X and 
records number of retry in a memory 4 each time entry 
is executed. When read-out from the address X 
succeeds, number of retry is read-out from the memory 
4. If number of retry is not less than prescribed number, 
an alternative address Y of the address X is secured on 
the optical disk, data read-out from the address X is 
copied in the address Y. Time period when DMA of the 
optical disk is rewritten so that data is read-out from 
the address Y at the time of generating read-out 
command to the address X by a high-ranking device 20, 
is thereafter set to the time when the optical disk device 
does not execute read-in treatment or write-in treatment. 









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