Sector servo seek control

Details Sector servo seek control Sector servo seek control

1982-05-17

1985-10-01

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 555

Patent

active

045449686

ABSTRACT:
A sector servo seek control samples each sector to obtain sector time, the track identification within a sequence of track types and a position error signal for a track location to track location seek. The device during each sector determines the actual transducer track location and the next sector projected track location with respect to the sequence of track types. The projected track location is corrected using the error signal to find the actual location, but if a sector signal is missing or erroneous, the projected location is used as the actual location, permitting a composite correction to be made when a correct sector signal is obtained. The seek time is minimized by using maximum acceleration followed by maximum deceleration while not exceeding a velocity value that would cause the device to overshoot the target track using full deceleration.

REFERENCES:
patent: 4031443 (1977-06-01), Droux et al.
patent: 4257074 (1981-03-01), Goss
patent: 4297734 (1981-10-01), Laishley et al.
patent: 4352131 (1982-09-01), Van Herk et al.
patent: 4355273 (1982-10-01), DuVall
patent: 4381526 (1983-04-01), McLaughlin et al.
IBM Technical Disclosure Bulletin, vol. 22, No. 11, Apr. 1980, Fast Eigenvector Control of a Disk File Actuator, pp. 5069-5075, R. S. Palmer.

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