Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1991-03-07
1992-03-24
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 75, 360 7708, 360 67, G11B 5596, G11B 502
Patent
active
050993674
ABSTRACT:
A magnetic disk drive wherein the radial position of a sensing head being positioned by a servo system is ascertained from the sensing of servo signals arranged in successive groups of tracks on a disk surface, each of the tracks in a group being of a different track type and said servo signals being in relative circumferential positions according to the track types of the tracks containing those signals. The sensed servo signals are linearly related to the radial position of the head relative to the track containing the corresponding servo signal, the linear relationship extending over a radial distance of a plurality of tracks, are amplified by a gain controlled amplifier, and are gated to respective detectors corresponding to different track types. The amplifier is controlled by a gain error signal derived from comparison of the sum of the outputs of the detectors to a reference level. Combinations of the detector signals are used to position a read/write head corresponding to the sensing head over selected tracks or radial positions between tracks. The dedicated servo surface is also used for control purposes during servo writing on the data surfaces and to generate a Gray code for track identification.
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Digital Equipment Corporation
Garland Steven R.
Psitos Aristotelis
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