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Full text of "USPTO Patents Application 10670332"

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PATENT ABSTRACTS OF JAPAN 



(51)Int.CI. 



(1 DPublication number : 05-274814 
(43)Date of publication of application : 22.10.1993 



(21) Application number : 04-066183 

(22) Date of filing: 24.03.1992 



G11B 20/18 
61 IB 7/00 
61 IB 11/10 
G11B 19/02 
611B 19/12 



(71) Applicant:TOSOHCORP 

(72) Inventor : SUGIYAMA SHIGETAKA 



(54) DEFECTIVE SECTOR DETECTING METHOD OF OPTICAL DISK DEVICE AND OPTICAL 
DISK 



(57)Abstract: 

PURPOSE: To provide the defective sector detecting 
method in an optical disk device and an optical disk 
which reduce the probability generating a secondary 
defective sector at the time of a reproduction and 
reduce the lost of data by the generation of the 
secondary defective sector. 
CONSTITUTION: In an optical disk device having an 
optical head 2 recording/ reproducing data for an optical 
disk 1 , the device has a slice detection means 4 
performing the detection of a defective sector by a slice 
detection method and differential zero cross detection 
means 6, 8 performing the detection of the defective 
sector by a differential zero cross detection method, and 
a primary defective sector is detected by the slice 
detection means 4 at the time of performing a 
formatting. When data is recorded, a secondary defective 
sector is detected by the slice detection means 4. When 
data is reproduced, the secondary defective sector is 
detected by the differential zero cross detection means 
6, 8. 




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