Title:
OPTICAL DISK
Document Type and Number:
Japanese Patent JPH043368
Kind Code:
A
Abstract:
PURPOSE:To easily and surely detect whether each sector in a user recording area is used or not by referring a written sector where plural flags indicating whether respective sectors in the user recording area are used or not are set. CONSTITUTION:At the time of shipping, all flags in a written sector flag area WSFZ on an MO disk 2 are set to '0'. In a magneto-optical disk control circuit 3 of a magneto-optical disk device 1 which additionally records desired information data in a user recording area ARVSE on the disk 2, contents of the written sector flag area WSFZ are read out to a memory circuit 4 before recording of information data. Contents of the area WSFZ are searched to detect flags set to '0', and desired information data is written in an idle sector. The circuit 3 sets the flag value in the area WSFZ on the disk 2 to '1'. The area WSFZ is referred to easily detect whether each sector of the user recording area ARVSE is used or not.
Inventors:
OTSUKI TADASHI
Application Number:
JP10451590A
Publication Date:
January 08, 1992
Filing Date:
April 20, 1990
Export Citation:
Assignee:
SONY CORP
International Classes:
G11B7/007; G11B11/10; G11B11/105; G11B19/02; G11B20/12; G11B27/24; G11B27/30; G11B27/32; (IPC1-7): G11B20/12; G11B7/24; G11B11/10
Attorney, Agent or Firm:
Kei Tanabe
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