Head position controller for a disc storage unit

Details Head position controller for a disc storage unit Head position controller for a disc storage unit

1987-07-02

1990-10-30

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 61, 360 7705, 360 7708, 360 75, G11B 555, G11B 5596

Patent

active

049672924

ABSTRACT:
A head position controller for a disc storage unit comprises a plurality of disc surfaces, and a plurality of read/write heads corresponding to the disc surfaces. Servo information is written into at least two disc surfaces. This controller comprises a selector for selecting one read/write head which can read the servo information written on a disc surface which is the closest to a read/write head to be selected as a head for reading out/writing recording information in accordance with specific bits in a head selection command, a detector for detecting an off-track amount in accordance with the readout servo information, and a circuit for correcting a position of read/write heads in accordance with the detected off-track amount.

REFERENCES:
patent: 4396956 (1983-08-01), Hedlund
patent: 4598327 (1986-07-01), Jen et al.
patent: 4638384 (1987-01-01), Stewart et al.
patent: 4639863 (1987-01-01), Harrison et al.
patent: 4669004 (1987-05-01), Moon et al.
patent: 4783705 (1988-11-01), Moon et al.
IBM TDB, vol. 24, No. 7A, "Servo Concept for Buried Servo Without Use of Dual Gap Heads", Lissner et al., Dec., 1981, pp. 3181-3182.
IBM Technical Disclosure Bulletin, vol. 29, No. 5, Oct., 1986, pp. 2304-2305.

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