发明授权
US5777965A Optical disk having an erased-state indicator and optical disk apparatus
for reducing frequency of disk-erasing operations
失效
具有擦除状态指示器的光盘和用于减少磁盘擦除操作频率的光盘装置
- 专利标题： Optical disk having an erased-state indicator and optical disk apparatus for reducing frequency of disk-erasing operations
- 专利标题（中）： 具有擦除状态指示器的光盘和用于减少磁盘擦除操作频率的光盘装置
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申请号： US683174申请日： 1996-07-18
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公开(公告)号： US5777965A公开(公告)日： 1998-07-07
- 发明人: Satoshi Itami , Masaru Nakahara , Masahiro Nakada , Hiroshi Suzuki , Kenichi Utsumi
- 申请人： Satoshi Itami , Masaru Nakahara , Masahiro Nakada , Hiroshi Suzuki , Kenichi Utsumi
- 申请人地址： JPX Kawasaki
- 专利权人： Fujitsu Limited
- 当前专利权人： Fujitsu Limited
- 当前专利权人地址： JPX Kawasaki
- 优先权： JPX4-062606 19920318
- 主分类号： G11B7/00
- IPC分类号： G11B7/00 ; G06F3/06 ; G11B7/0037 ; G11B7/004 ; G11B7/0055 ; G11B7/006 ; G11B7/007 ; G11B11/10 ; G11B11/105 ; G11B19/00 ; G11B19/02 ; G11B20/10 ; G11B20/12
摘要：
An optical disk includes a user accessible area having a plurality of blocks and flag data recorded on the optical disk. The flag data indicates whether or not each of the blocks is in an erased state in which there is no recorded data. A flag area stores the flag data, and area data indicating that the optical disk has the flag area is recorded on the optical disk.
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