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Full text of "USPTO Patents Application 10670332"

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PATENT ABSTRACTS OF JAPAN 



(1 1 publication number : 1 0-261 286 

(43)Date of publication of application : 29.09.1 998 



(51)Int.CI. 




G11B 27/10 
G11B 7/00 
G11B 27/00 




(21)Application number 


09-133188 


(71)Applicant 


. HITACHI LTD 


(22)Date of filing : 


23.05.1997 


(72)Inventor : 


SAITO TADASHI 


i. _ . 






ITO TAMOTSU 



(54) INFORMATION RECORDING MEDIUM 

(57)Abstract: 

PROBLEM TO BE SOLVED: To effect a high speed reading of 
data in which data being on a rewriting impossible recording 
medium are apparently corrected and added and to attain the 
effective utilization of all areas of a disk by managing data 
before and after corrections and addition while providing 
directory parts. 

SOLUTION: A directory part D(0) 20 is provided in the first 
sector of a disk and an inherent code, the number of files and 
data for retrieval are recorded in the part 20. In the case of 
correcting the recorded data of the disk or of adding a file to 
the disk, a new data file AF(1) 40 is recorded in an unused 
area and also a new directory part D(1) 41 is recorded in an 
unused area and the address of the D(1) is recorded in an 
unused block next to the old directory part D(0) 20 and, 
thereafter, the accessing of data is performed by using the D 
(1) 41. Also in the case of performing the changing of data 
again, the directory part is updated to a new directory part 
similarity to form the newest directory part always and the 
shortening of access is made possible. 



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