Servo positioning control system for a data storage apparatus

Details Servo positioning control system for a data storage apparatus Servo positioning control system for a data storage apparatus

1980-11-10

1983-03-22

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 77, G11B 2110

Patent

active

043778275

ABSTRACT:
A servo system in a disc drive for accessing and maintaining selected data tracks on a stack of discs has a first continuous position signal derived from a pre-recorded surface and a second position signal derived from servo information in sectors of the other discs. The first and second position signals are combined to form a hybrid signal to control the actuators. The hybrid signal is the second signal when the second signal is generated. When the second signal is not generated, the hybrid signal is a modified first signal plus the last known second signal. The modified first signal is the difference between the first signal presently generated and the first signal generated when the second signal was last generated.

REFERENCES:
patent: 4072990 (1978-02-01), Case et al.
patent: 4115823 (1978-09-01), Commander et al.

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