Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1996-02-28
1997-03-11
Sniezek, Andrew L.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7811, 360 7702, 360 75, G11B 5596
Patent
active
056107773
ABSTRACT:
The present invention relates to a method and apparatus for writing servo tracks of a magnetic disk unit, and has an object of providing a servo track writing method and apparatus which can reduce a mechanical vibration of a head in the steady state and can shorten a settling time of the system. A detecting face is set in the vicinity of a head arm end portion 22 of a magnetic disk unit 2, and a capacitance probe 28 is provided as a gap detecting means for detecting a gap in a head moving direction between the detecting face and the head arm end portion 22. Further provided are a rotary positioner 26 as a positioning means for moving the capacitance probe 28 in the head moving direction to position it at a target position, and a head drive system control means for moving a head 14 of the magnetic disk unit 2 so that the gap is kept constant, to position the head 14 at a predetermined servo track writing position.
REFERENCES:
patent: 5227625 (1993-07-01), Hebzler
patent: 5268801 (1993-12-01), Hazel et al.
patent: 5315372 (1994-05-01), Tsai
patent: 5319509 (1994-06-01), Michelson et al.
patent: 5325349 (1994-06-01), Taniguchi
IBM Technical Disclosure Bulletin, vol. 23, No. 3, Aug. 1980, pp. 1234 to 1235, entitled "Writing Servo Patterns in Disk Files" by A. Bennett et al. pp. 1234-1235.
Dang Hien P.
Nakagawa Takahiro
Nakamoto Yoshiyasu
Sri-Jayantha Muthuthamby
Suzuki Hiroyuki
Billion Richard E.
Cullen Larry T.
Hoffman Michael F.
International Business Machines - Corporation
Sniezek Andrew L.
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