Disk drive head position controller with static bias compensatio

Details Disk drive head position controller with static bias compensatio Disk drive head position controller with static bias compensatio

1988-04-01

1990-08-14

Richardson, Robert L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7704, G11B 5596, G11B 556

Patent

active

049492012

ABSTRACT:
A positioning system for a hard disk drive for rapidly and accurately positioning the disk head. A constant bias compensation signal is injected into the feedback loop to reduce positioning delays otherwise caused by a steady state force which is asserted against the head. High and low velocity measuring techniques are also disclosed, along with several techniques for advantageously injecting these measurements into the feedback loop at appropriate times. An improved resonant filter is also disclosed.

REFERENCES:
patent: 4068269 (1978-01-01), Commander et al.
patent: 4333117 (1982-06-01), Johnson
patent: 4379256 (1983-04-01), Maury
patent: 4536809 (1985-08-01), Sidman
patent: 4547822 (1985-10-01), Brown
patent: 4724369 (1988-02-01), Hashimoto

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