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> (54) SS (Title) 

► (19)(13) 



OPTICAL DISK DEVICE 



► (11)§3HS£(Pub.No.)/SJ» 

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► (51) IPC INDEX 



(57) fifif (Abstract) 



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2000339874 (2000.12.08) 
1999142563(1999.05.24) 

G11B 20/18; G11B7/00; G11B 20/10; G11B 20/12 



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PROBLEM TO BE SOLVED: To enable the continuation of the recording or reproducing 
operation without interruption when the defective block is generated during the continuous 
recording or reproducing operation. 

SOLUTION: When the defective block is generated on the optical disk 71 during the data 
recording or reproducing operation, alternate data of the defective block or the address of 
the defective block are continuously stored in a defect list 3 during at least one of 
continued data is recorded or reproduced. Then, the arrangement is made so that the 
alternate data stored in an alternate buffer memory 2 are written into the spare area of the 
optical disk 71 and the address of the defective block stored in the defective list 3 is 
written into the defective control area of the optical disk 71 , after the recording of at least 
one of the continued data is finished or the reproduction of it is finished, or when the 
optical disk is taken out. COPYRIGHT: (C)2000,JPO 



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► (71)Sfj2J(Applicant) 

► (72) BS»('nventors) 

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KENWOOD CORP 
TOKIWA KAZUNORI 



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