Servo control of seek operation in magnetic disk drive

Details Servo control of seek operation in magnetic disk drive Servo control of seek operation in magnetic disk drive

1983-11-25

1985-07-30

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

318561, G11B 2108

Patent

active

045325626

ABSTRACT:
An improved method and apparatus for servo control of the position of a read/write head with respect to a magnetic disk is disclosed. The disk comprises permanently recorded position data information. Upon initiation of a head traverse or "seek" operation, the microprocessor is controlled to select predetermined portions of instruction sequences, all of which sequences are used in the event the seek is such that the head reaches its maximum velocity. Otherwise, portions of the accelerate and decelerate command sequences are chosen together with constant velocity commands as necessary to insure that the head is decelerated smoothly to a stop at the appropriate position.

REFERENCES:
patent: 3699555 (1972-10-01), Du Vall
patent: 4115823 (1978-09-01), Commander et al.
patent: 4237502 (1980-12-01), Erickson, Jr. et al.
patent: 4272793 (1981-06-01), Landingham
patent: 4297734 (1981-10-01), Laishley et al.
Patent Abstracts of Japan, vol. 4, No. 118, Aug. 22, 1980, p. 90P24, K. K. Fujitsu, "Automatic Gain Control System".

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