Sampled servo seek and track follow system for a magnetic disc d

Details Sampled servo seek and track follow system for a magnetic disc d Sampled servo seek and track follow system for a magnetic disc d

1986-10-14

1988-10-04

Faber, Alan

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 77, G11B 5596

Patent

active

047759038

ABSTRACT:
An improved method and apparatus for performing seek and track follow operations in a disc drive provides time varying acceleration profile and track position trajectory signals which have the same time duration and which are developed as a function of seek length. These signals are successively simultaneously sampled at the same points in time. The sampled acceleration profile and track position trajectory signals from the same points in time are simultaneously applied as a feed forward signal and a position reference signal, respectively, in the disc drive to position a magnetic head at a selected track. During a seek operation, each actual track position signal and subtrack position signal from the transducer is compared with an existing sampled track position trajectory signal. At the end of the seek movement, track following continues under the control of the subtrack position signals.

REFERENCES:
patent: 4679103 (1987-07-01), Workman

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