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Published Serial No. 


TW413805 


Title 


Information recording disk with replacement area 


Patent type 


B 


Dale of Grant 


2000/12/1 


Application Number 


86102862 


FjlkgrDate 


1997/3/8 


IPC 


G11B7/00 


Inventor 


TAKAHASHI, HIDEKI(JP) 


Priority 


Country 


Application 


Priority Date 


JP 


19960068524 


3/25/1996 


Applicant 


Name 


Country 


Individual/ Company 


TOSHIBA CORP 


JP 


Company 


Abstract 


The invention relates to a information recording disk with a 
replacement area, which is a disk OD capable of recording data 
while rotating at one of multiple rotation speeds. The disk OD 

records data when disk OD rotates with rotation speed N2 and it 
comprises a data area DA in concentric or spiral form with respect 
to rotation center; and a replacement area RA2 formed spirally or 
concentrically with the center of rotation of the disk OD on a side 
farther to the center of rotation of the disk than the data area DA2, 
in which, upon detecting a write error in the data area DA2 during 
rotation of the disk OD at the rotation speed N2, information 
indicating generation of the write error is replaced and recorded at 
the rotation speed N2. 



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