Servo system for data storage apparatus

Details Servo system for data storage apparatus Servo system for data storage apparatus

1981-06-26

1983-08-23

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 2110

Patent

active

044007477

ABSTRACT:
The servo system includes the use of servo signals of four types such that each group of four adjoining servo tracks identifies the center line of a data track of interest and presents unique signals from the respective four servo tracks. The analog value of the signals are stored and sensed to provide a substantially linear position error signal over a three-track wide region. By using variable gain with respect to the analog signals, compensation for the variance between data head width and track pitch, and a quadrature servo portion, linearity can be achieved. In addition, since the substantially linear region is three tracks wide and the position error signal does not become ambiguous over a width of four tracks, a one-track seek can be accomplished using an error signal rather than a seek.

REFERENCES:
patent: 3175205 (1965-03-01), Auyang
patent: 3593333 (1971-07-01), Oswald
patent: 3691543 (1972-09-01), Mueller
patent: 4101942 (1978-07-01), Jacques
patent: 4208679 (1980-06-01), Hertrich
patent: 4297737 (1981-10-01), Andresen et al.
patent: 4322760 (1982-03-01), Hardwick

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