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PATENT ABSTRACTS OF JAPAN 

(1 1 publication number : 2000-090588 
(43)Date of publication of application : 31.03.2000 



(51)lnt.CI. 



G11B 20/12 
Q11B 7/0045 
GtIB 20/10 
G11B 20/18 
GtIB 27/10 



(21 application number : 11-249720 
(22)Date of filing: 03.09.1999 



(71 Applicant : LG ELECTRONICS INC 
(72)Inventor : PARK YONG CHEOL 



(30)Priority 

Priority number : 98 9836824 



Priority date : 07.09.1 998 Priority country : KR 



(54) SEARCHING METHOD AND DEVICE FOR USABLE ALTERNATE BLOCK OF OPTICAL 
RECORDING MEDIUM 

(57)Abstract: 

PROBLEM TO BE SOLVED: To make an alternate block w 
searchable correctly by judging whether an entry to 
which an alternate block is not assigned exists or not 
when a registered entry exists in a secondary defective 
data storage part and judging the normal block of an 
alternate area to be usable when only an entry to which 
an alternate block is not assigned exists. 
SOLUTION: A DMA information reading part 606 reads 
out information stored in the DMA on an optical disk 601 
through a data processing part 604, and a discriminating 
part 607-1 discriminates whether the entry registered in 
a secondary defective data storage part (SLD) exists in 
the read out DMA information or not When the entry 
does not exist in the SLD, an alternate block deciding 
part 607-2 judges a normal block coming next to the 
final data block of the zone to be usable block. 
Moreover, when the entry exists in the SLD, the part 
607-2 decides a usable alternate block by judging the 
presence or absence of the entry of the SLD to which 
an alternate block is assigned. 



http.7/www19.ipdl.inpit.go.jp/PA1/result/detail/main/wAMrXayX5DA4... 2008-05-31 



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