Process and system for compensating for information shifts on di

Details Process and system for compensating for information shifts on di Process and system for compensating for information shifts on di

1986-02-14

1987-10-13

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 78, G11B 555, G11B 556

Patent

active

047002441

ABSTRACT:
An improved system and process is provided in a disc drive for determining and for compensating head/track offsets when a data (target) head is moved to a new data (target) track position. Such disc drives typically include an armstack with transducer heads thereon, either pivotally or linearly mounted to move the transducer heads radially across a plurality of memory discs in a disc stack. A dedicated reference head is provided for scanning dedicated servo tracks on a dedicated memory disc, and a data head is provided on each data disc.
Head/track position offset is determined by generating an initial position offset signal indicative of the position offset between the dedicated head and an adjacent dedicated track while a selected data head, called the present head, is centered on its data track.
Head/track position offset is compensated using this initial position offset signal in conjunction with a command signal including a track count to a dedicated target track, to generate a velocity profile and servo current commands used to achieve movement of the dedicated head to a position from which it may be track centered at the target track position. Thereafter any offset between the target head and its target track is used to center the target head on its target track.

REFERENCES:
patent: 3994016 (1976-11-01), Moghadam
patent: 4115823 (1978-09-01), Commander et al.
patent: 4377827 (1983-03-01), Rose
patent: 4536809 (1985-08-01), Sidman
patent: 4556921 (1985-12-01), Rose

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