Multiple force retract circuit for a magnetic disk drive

Details Multiple force retract circuit for a magnetic disk drive Multiple force retract circuit for a magnetic disk drive

1986-09-30

1989-02-21

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360105, 318563, G11B 554, G05B 902

Patent

active

048070629

ABSTRACT:
A magnetic disk drive in which a magnetic head contacts to a landing zone on a magnetic disk when the rotation of the magnetic disk is stopped. The magnetic disk drive is characterized by the provision of abnormality detection means for detecting that the drive is in abnormal condition, position detection means for detecting whether or not the magnetic head has moved to the landing zone or not, control means for outputting a first instruction signal when the abnormal condition is detected by the abnormality detection means and for outputting a second instruction signal when it is detected by the position detection means that the magnetic head has not yet moved to the landing zone, and drive means for driving the magnetic head by a first drive force when said first instruction signal is inputted and for driving the magnetic head by a second drive force greater than the first drive force when said second instruction signal is inputted, whereby the magnetic head is moved to the landing zone. Thus, even when the carriage is located at any position, or even when the magnetic disk drive is installed in any position, the optimum retraction is possible.

REFERENCES:
patent: 3518651 (1970-06-01), Keeney
patent: 3629679 (1971-12-01), Halfhill
patent: 4139874 (1979-02-01), Shiraishi
patent: 4237501 (1980-12-01), Barmache et al.
patent: 4658308 (1987-04-01), Sander, Jr.
patent: 4679102 (1987-07-01), Wevers et al.

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