High speed seek sector servo magnetic disk drive unit

Details High speed seek sector servo magnetic disk drive unit High speed seek sector servo magnetic disk drive unit

1989-09-15

1992-07-21

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7708, 360 7804, G11B 555

Patent

active

051328542

ABSTRACT:
A disk drive unit is disclosed, which comprises a recording medium having more than two disk-shaped recording faces disposed on each other with an interval; information tracks disposed along the periphery on the more than two recording faces and servo signal fields on the recording faces, in the peripheral direction for different recording faces; more than two heads reading out servo information from the servo signal fields on the more than two recording faces; head moving means for moving the heads in the radial direction of the recording faces, linked with each other; means for obtaining position signals on the recording faces at different points of time for different heads on the basis of the servo signals; means for obtaining information on the relative velocity of the heads to the recording faces from the position signals at different points of time for different recording faces, and control means for effecting the velocity control by means of the head moving means on the basis of the information on the relative velocity.

REFERENCES:
patent: 4737869 (1988-04-01), Sugaya et al.
patent: 4807063 (1989-02-01), Moteki
patent: 4809120 (1989-02-01), Ozawa
patent: 4896228 (1990-01-01), Amakago et al.
IBM Tech. Disc. Bulletin, vol. 17, No. 6, Nov. 1974, Correction of Data Track Misregistration in Servo Controlled Disk Files, A. Paton, pp. 1781-1783.

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