发明授权
- 专利标题： Magnetic disk device and method of recording/retrieving information
- 专利标题（中）： 磁盘设备和记录/检索信息的方法
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申请号： US700095申请日： 1991-05-06
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公开(公告)号： US5109311A公开(公告)日： 1992-04-28
- 发明人: Masanobu Hanazono , Shinji Narishige , Yutaka Sugita , Hiroshi Fukui , Hirotsugu Fukuoka , Hajime Aoi , Masayuki Katsumoto , Takuji Ogawa , Jun Naruse , Yokuo Saitoh
- 申请人： Masanobu Hanazono , Shinji Narishige , Yutaka Sugita , Hiroshi Fukui , Hirotsugu Fukuoka , Hajime Aoi , Masayuki Katsumoto , Takuji Ogawa , Jun Naruse , Yokuo Saitoh
- 申请人地址： JPX Tokyo
- 专利权人： Hitachi, Ltd.
- 当前专利权人： Hitachi, Ltd.
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX63-67428 19880323; JPX63-283669 19881111
- 主分类号： C09D5/23
- IPC分类号： C09D5/23 ; C09D7/12 ; G11B5/012 ; G11B5/02 ; G11B5/09 ; G11B5/31 ; G11B5/82
摘要：
This invention provides a magnetic disk device having a total memory capacity of 30 giga bytes or more, or more desirably 30.about.40 giga bytes. The magnetic disk used in this magnetic disk device has a plane record density of 45.about.80 mega bits per square inch. The thin film magnetic head has a pole thickness (P.sub.T), a magnetic flux density (B.sub.s), a magnetic gap depth (G.sub.d) and a record wavelenth (.lambda.) which satisfy the formulaG.sub.d .ltoreq.0.13 P.sub.T B.sub.s (.lambda.+4.3)-2.1.The magnetic disk rotation means rotate the magnetic disk at a speed of 24 m per second or more.
公开/授权文献
- US5734626A Synchronisation device comprising a time zone detector 公开/授权日：1998-03-31
信息查询
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