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Patent Agency Ranking
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公开(公告)号：DE2364762A1
公开(公告)日：1974-07-04
申请号：DE2364762
申请日：1973-12-27
Applicant: IBM
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公开(公告)号：DE3269244D1
公开(公告)日：1986-03-27
申请号：DE3269244
申请日：1982-11-23
Applicant: IBM
Inventor： KEIDL STEVEN DENNIS , SHIDLER KARL ALLEN
IPC: G11B5/596 , G11B5/012 , G11B5/02 , G11B19/12 , G11B19/28 , G11B21/10 , G11B23/36 , G11B23/42 , G11B27/32 , G11B17/02 , G11B5/55
Abstract: Control information for a flexible magnetic desk storage assembky (41, 42) is recorded on the periphery of the disk (42) in a region not used for recording data. The control information is read through the protective cover or envelope (41) which encloses the disk by means of a magnetic transducer (25) such as a four track audia cassette head which bears against the envelope. By recording index and sector pulses as part of the control information, hard sectoring can be inexpensively and accurately achieved. A recorded fixed frequency control signal can be read and used as part of the feedback loop in a phase locked oscillator used to control a d.c. motor driving the spindle. The control information can also include servo tracks which assist in registering the data transducer directly over data tracks on media which has changed its dimensions.
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公开(公告)号：DE3070161D1
公开(公告)日：1985-03-28
申请号：DE3070161
申请日：1980-08-27
Applicant: IBM
Inventor： KEIDL STEVEN DENNIS
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