Utilization of stored run-out information in a track following s

Details Utilization of stored run-out information in a track following s Utilization of stored run-out information in a track following s

1976-11-02

1979-01-16

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 78, 360109, 318617, 318653, G11B 2110, G11B 554

Patent

active

041352173

ABSTRACT:
A servo system including a recording head to sense servo data on a disk track for fine positoning of the head and an external transducer for generating signals representing the coarse position of the head. A micro-processor stores the coarse positon signals which include information as to repeatable error such as wobble of the disk. A compensator maintains information concerning small offsets of the disk due to, for example, temperature variations. During coarse positioning of the head, from one track to a desired track, the stored repeatable error information and stored offset information is used to generate error signals to control movement of a carriage connected to the head, whereby the head follows the repeatable error and offset to arrive coarsely on the desired track. After coarse positioning is complete, fine positioning information from the recording head, which information includes the offset information, and the stored repeatable error information are used to generate error signals to control movement of the carriage for fine positioning purposes.

REFERENCES:
patent: 3126535 (1964-03-01), Streeter
patent: 3699555 (1972-10-01), Duvall
patent: 3838457 (1974-09-01), Palmer
patent: 3881184 (1975-04-01), Koepcke et al.
patent: 3924268 (1975-12-01), McIntosh et al.
patent: 3994016 (1976-11-01), Moghadam
patent: 4032984 (1977-06-01), Kaser

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