Method and apparatus for controlling disc drive using...

Details Method and apparatus for controlling disc drive using... Method and apparatus for controlling disc drive using...

2006-06-20

2006-06-20

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

07064917

ABSTRACT:
A method and an apparatus to control a disc drive, and more particularly, a method and an apparatus to control a disc drive using a counter-electromotive force, prevents collision and malfunction of a transducer and a disc by determining external vibrations and magnitude of a shock without installing an additional shock sensor in the disc drive. The method of controlling the disc drive using a counter-electromotive force includes detecting a voltage applied to a voice coil during a predetermined mode, performing an operation of a value of the counter-electromotive force using the detected voice coil voltage comparing the value of the counter-electromotive force operated with a predetermined threshold, and when the value of the counter-electromotive force is equal to or larger than the predetermined threshold, controlling a voice coil motor and a spindle motor so that a current mode is stopped and a parking or unloading mode is executed.

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patent: 7-6488 (1995-01-01), None
“Quiescent Active Retract System for Disk File,” Nov. 1, 1996, IBM TDB vol. 39, No. 11, pp. 181-182.
European Search Report dated Jan. 17, 2006 for European Application No. 03019401.3.

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