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PATENT ABSTRACTS OF JAPAN 



(1 1 )Rubfication number : 07-1 68749 

(43)Date of publication of application : 04.07.1995 



(51)Int.CI. 




G06F 12/00 
G11B 27/00 




(21)Application number 


06-247476 


(71)Appficant 


: SONY CORP 


(22)Date of filing : 


13.10.1994 


(72)Inventor : 


IGARASHI TAKUYA 








MINAMI MASAFUMI 



(30)Priority 

Priority number : 05259912 



Priority date : 18.10,1993 Priority country : JP 



(54) INFORMATION MANAGING METHOD, DATA RECORDING MEDIUM, DATA RECORDING 
METHOD, INFORMATION RETRIEVING METHOD, AND INFORMATION RETRIEVER 

(57)Abstract: 

PURPOSE: To perform quick access. 
CONSTITUTION: The data track of a magneto-opticai 
disk is separated to a volume management area and an 
extent area, and the data of a file is recorded on the 
extent area, and directory managing information and file 
managing information on the volume management area. 

The volume management area is constituted of 32 ___ u . iJC _ 

clusters. The data allocation unit of the volume 
management area is set at 2k bytes, and that of the 
extent area at 8k bytes. A refative recording position in 
the volume management area of a subdirectory is 
recorded on the volume management area as directory 
information. 



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