Speed gain control based upon access time for each cylinder

Details Speed gain control based upon access time for each cylinder Speed gain control based upon access time for each cylinder

1991-12-20

1994-02-15

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7806, G11B 5596

Patent

active

052872343

ABSTRACT:
A servo control method for a magnetic disk apparatus having at least one magnetic disk, at least one head and a motor driving the head has the following steps. The first step is to measure a reference velocity control time necessary for a seek operation between two predetermined tracks among a plurality of tracks of the magnetic disk. The second step is to measure a plurality of velocity control times necessary for a plurality of seek operations in which the head moves a distance equal to a distance between the two predetermined tracks. The plurality of seek operations respectively have seek starting positions. The third step is to generate compensation data which controls the velocity control times obtained at step (b) to be equal to the reference velocity control time. The fourth step is to adjust a seek current supplied to the motor located in a servo control loop on the basis of the compensation data generated at step (c).

REFERENCES:
patent: 4331987 (1982-05-01), Oda et al.
patent: 4333117 (1982-06-01), Johnson
patent: 4622604 (1986-11-01), Hashimoto et al.
patent: 4899234 (1990-06-01), Genheimer
patent: 4907109 (1990-03-01), Seino
patent: 5010425 (1991-04-01), Asai
patent: 5063454 (1991-11-01), Hashimoto
patent: 5150266 (1992-09-01), Albert
patent: 5189571 (1993-02-01), Murphy et al.

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