Positioning misaligned disk heads

Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head

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Details

360 78, G11B 555, G11B 556

Patent

active

046333452

ABSTRACT:
Technique for dynamically maintaining alignment of servo controls in a disk drive system which uses external indicia to position the head assembly between tracks containing embedded servo signals; the latter used to control track following. Plural pairs of phase staggered track reference signals are derived from the external indicia, and during system initialization an optimal pair is selected for controlling head positioning. The system is initialized both at power up time and after detection of certain errors. The selection is made by using each pair separately to direct positioning of the head assembly over a predetermined range of sampling positions at each of which centering offsets relative to the embedded servo signals are measured and recorded in association with the respective pair. Based on an evaluation of these offsets, the system microprocessor selects a reference signal pair having the least average offset to control subsequent head positioning operations. The system is then readied for "normal" read/write operation.

REFERENCES:
patent: 4086659 (1978-04-01), Cizmic et al.
patent: 4297734 (1981-10-01), Laishley et al.
patent: 4355273 (1982-10-01), Du Vall
patent: 4455583 (1984-06-01), Schultz
patent: 4516177 (1985-05-01), Moon et al.

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