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PATENT ABSTRACTS OF JAPAN 





(H)Pubiicati 


on number : 


06-309802 




(43)Date of publication of application : 04.1 1.1994 


(51)IntCL 




G11B 20/12 
G11B 7/007 

III ID 1 9/ £4 1 




(21 Application number 


: 05-102377 


(71)Applicant 


: MATSUSHITA ELECTRIC IND CO 
LTD 


(22)Date of filing : 


28.04.1993 


(72)Inventor : 


INAGAKI SHINKO 
FUKUSHIMA YOSHIHISA 
YAMASHITA HARUO 
HIGASHIYA YASUSHI 
HAMASAKA HIROSHI 



(54) INFORMATION RECORDING MEDIUM, AND INFORMATION RECORDING AND 
REPRODUCING APPARATUS 

(57)Abstract: 

PURPOSE: To make the access speed of an information 
recording and reproducing apparatus fast by a method 
where the number of revolutions of a motor is reduced 
as an optical head, is moved with reference to a zone in 
the outer circumference in a recording operation so as 
to reduce laser recording power to the minimum and the 
motor is turned at a high speed irrespective of a zone in 
a reproducing operation. 

CONSTITUTION: A disk-shaped information recording 
medium is divided into sectors, and a control data region 
which contains disk management information and zone 
management information is allocated to their front. A 
user region which contains a random-access region and 
a continuous-access region is allocated to the sectors 
after that. At this time, the random-access region is 
divided into zone 1 to zone (n\ and the continuous- 
access zone is divided into zone n+1 to zone n+m, A 
data modulation and demodulation system, an error 
correction system, a front track number and a last track 

number in the user region, management information in the random-access region and the 
continuous access region which have been allocated to the user region, the number of zones 
and the like are recorded as the disk management information in the control data region. As the 
zone management information which is continued to it, management information and control 
information for every zone are recorded. 



http://www19.ipdI.inpit.gojp/PA1/result/detail/main/wAAAp8aOalDA406309802P... 2009/09/18 



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