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(S4)Title: METHOD FOR REPLACEMENT FOR OPTICAL DISC, AND AN OPTICAL DISC 

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a . . . ECC block 

b ... 16 sectors, 32K bytes 

c ... Defective sector 

d . . . sectors 

e . . . Recording interruption 

t ... During this period (1 sector) recording is 

interrupted 

g . . . Recording resumption 



(57) Abstract 

In an optical disc on which data are recorded in units of an ECC block having (16) sectors, during an initial period such as during the 
manufacture or at the beginning of use, dummy data are recorded, the dummy data are reproduced to detect initial defective sectors, and the 
addresses of the initial defective sectors arc recorded on the optical disc. Data are recorded in units of an ECC block, skipping the initial 
defective sectors. In such an optical disc on which data are recorded in units of an ECC block, during data recording in other than the initial 
period, data are recorded, the data are reproduced to detect ECC blocks having sectors with secondary defects, and data of the ECC blocks 
containing sectors with secondary defects are recorded in separately prepared ECC blocks. 



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International application No. 

PCT/JP97/00755 


A. CLASSIFICATION OF SUBJECT MATTER 

Int. Cl 6 G11B20/12, 20/18, 20/10 

According to International Patent Classification (IPC) or to both national classification 


and IPC 


B. FIELDS SEARCHED 



Minimum documeoutioo lurched (dtstincMion system followed by classifies tioo symbols) 
Int. Cl6 G11B20/12, 20/18, 20/10 



Documentation searched other dun minimum documentation to the extent that auch documents are included in the fields searched 

Jitsuyo Shman Koho 1926 - 1997 

Kokai Jitsuyo Shinan Koho 1971 - 1997 

Toroku Jitsuvo Shinan Koho 1994 - 1997 



Electronic data base consulted during the international search (name of data base and, where practicable, search terms used) 



C. DOCUMENTS CONSIDERED TO BE RELEVANT 



Category* 



Citation of document, with indication, where appropriate, of the relevant passages 



Relevant to daim No. 



Y 
A 

Y 
A 



Y 
A 

Y 
A 



Y 
A 



JPr 6-111479, A (Nikon Corp.), 

April 22, 1994 (22. 04. 94) (Family: none) 

JP, 4-28061, A (Matsushita Electric Industrial 
Co. , Ltd.) , 

January 30, 1992 (30. 01. 92) (Family: none) 
Page 2, lower left column, line 2 to page 3, 
lower left column, line 18 

JP, 3-219465, A (Sharp Corpi), 

September 26, 1991 (26. 09. 91) (Family: none) 

JP, 6-349206, A (Matsushita Electric Industrial 
Co. , Ltd.) , 

December 22, 1994 (22. 12. 94) (Family: none) 
Column 5, line 12 to column 6, line 1 

JP, 6-251499, A (Sony Corp.), 

September 9, 1994 (09. 09. 94) (Family: none) 

Column 3, lines 3 to 8 



1-38 

39 - 54 

1-38 

39 - 54 



1 
39 

1 
39 



1 
39 



38 
54 

38 
54 



38 
54 





X] Further documents are listed in the continuation of Box C. Q See patent family annex. 




Spccul categories of cited doaunents: "T later dociimcoipu Wished. ftert^ 
A document defining tie general state of the art which is not considered *** and Bot m conflict with the application but died to understand 
to be of particular relevance ihe principle or theory underlying** invention 

"E" cariier document bat published on or after the JnteruiUonal filing date "X" document of particular relevance; the daimed invention cannot be 
"L" document which nay throw doubts on priority daimfa) or which is considered novel or cannot be considered to involve an inventive 
cited to establish the publication date of another dudon or other p whcn document is taken alone 

special reason (ss specified) M Y N document of particular relevance; the dain^ invention cannot he 
^ ****** to 10 0I » I disclosure, use, exhibition or other considered to involve an inventive step when the document is 
mejDS combined with one or more other such documents, such combination 
"P" -document published prior to the international filing dale but later than E obvtoU5 10 * P*™ 00 'killed in the art 
the priority date claimed "*~ document member of the s-mc patent family 




Date of the actual completion of the international search 
May 23, 1997 (23. 05. 97) 


Date of mailing of the international search report 

June 3, 1997 (03. 06. 97) 


F 


Name and mailing address of the ISA/ 

Japanese Patent Office 

Facsimile No. 

arm PCT/ISA/21 fl iwnnH HkHa TuaZ i oo->\ 


Authorized officer 
Telephone No. 



INTERNATIONAL SEARCH REPORT 



International application No. 

PCT/JP97/00755 



C (Continuation). DOCUMENTS CONSIDERED TO BE RELEVANT 



Category* 



Citation of document, with indication, where appropriate, of the relevant passages 



Relevant to claim No. 



A 
Y 

A 

Y 



JP, 62-20141, A (Matsushita Electric Industrial 
Co. , Ltd. ) , 

January 28, 1987 (28. 01. 87) (Family: none) 
Page 2, upper left column, line 14 to upper 
right column, line 12 



JP, 5-174498, A (International Business Machines 
Corp . ) , 

July 13, 1993 (13. 07. 93) (Family: none) 
Column 13, line 27 to column 16, line 7 



JP, 2-141973, A (Canon Inc.), 

May 31, 1990 (31. 05. 90) (Family: none) 



2-4, 9-11, 
17-19, 24-26, 
32-34 



40-42, 48-50 

2-4, 9-11, 
17-19, 24-26, 
32-34 

40-42, 48-50 

6, 7, 13, 14 J 
21, 22, 28, 
29, 36, 37 
44, 45, 52, 
53 



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