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PATENT ABSTRACTS OF JAPAN 

(1 1 publication number : 10-050005 
(43)Date of publication of application : 20.02.1998 



(51)IntC1. 



(21 Application number : 08-199339 
(22)Date of filing: 29.07.1996 



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(71) Applicant : NEC GUMMA LTD 

(72) Inventor ; AMARI SHINICHI 



(54) METHOD FOR MANAGING DEFECT ON OPTICAL DISK AND DEVICE THEREFOR 

(57)Abstract: 

PROBLEM TO BE SOLVED: To ensure a data by 
performing alternate processing on an after- defective 
sector causing read retrial at the time of executing a 
read command and based on a recovered read data by 
the read retrial in the midst of this read command and 
hence to prevent processing speed from lowering due to 
the read retrial and also reliability of the data from 
deteriorating upon access next time and afterward. 
SOLUTION: The alternate processing is performed on 
the sector causing the read retrial by an erasing 
execution part 21, a writing execution part 22 and a 
verifying execution part 23 in an alternate processing 
access range, and the sector subjected to the alternate 
processing is ensured in data normality by alternate 
processing checking part 24, and then a defective 
original address and an alternate address are added to 
an SDL, etc., by a defect list register part 25 to finish 
the alternate processing. Then, when the normality of 
the data cannot be obtained at the alternate address, a 
new alternate object is calculated again by an alternate address calculating part 20, and the 
above procedure is repeated until the normality can be confirmed. 




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