Record track following and seeking

Details Record track following and seeking Record track following and seeking

1975-12-23

1977-09-13

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 78, 360135, G11B 558, G11B 1700, G11B 2110

Patent

active

040486605

ABSTRACT:
An improved servo block pattern bands a plurality of parallel record tracks into a track seek and follow band. Servo block positions in the record tracks, plus the longitudinal duration of the signal bursts enable simultaneous track seeking and following within a band of tracks. Servo apparatus operable with such patterns adapt to amplitude variations of the servo readback signal to reduce the effect of amplitude variations on servo performance. The servo blocks may have differing frequencies or correlation patterns for enhancing track seek and follow functions.

REFERENCES:
patent: 3479664 (1969-11-01), Stuart-Williams et al.
patent: 3491347 (1970-01-01), Farrand
patent: 3534344 (1970-10-01), Santana
patent: 3699555 (1972-10-01), Du Vall
patent: 3737883 (1973-06-01), Sordello
patent: 3812533 (1974-05-01), Kimura et al.
patent: 3893180 (1975-07-01), Braun et al.
patent: 3919697 (1975-11-01), Walker
IBM Technical Disclosure Bulletin, Comstock et al., Quadrature Servo Signal Utilizing a Detection System, vol. 16, No. 7, p. 2204.
IBM Technical Disclosure Bulletin, Wallis, Tri-Bit Servo Pattern, vol. 16, No. 11, Apr. 1974, p. 3757.

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