Disc drive apparatus with tracking control based on multiple ref

Details Disc drive apparatus with tracking control based on multiple ref Disc drive apparatus with tracking control based on multiple ref

1990-12-17

1993-03-02

Sniezek, Andrew L.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4426, 369 4429, 360 7806, G11B 700, G11B 5596

Patent

active

051915685

ABSTRACT:
The present invention provides a disc drive apparatus having an improved tracking control and seek time adjustment. The head tracking error distribution along the disc radius is determined with reference to the phases of a plurality of position sensors and is calculated based on the tracking error of a reference track in first and second reference regions with respect to the signal from one of the position sensors. This information is used to determine the tracking error distribution along the disc radius with respect to that one of the position sensors. The tracking error distribution is used to determine the tracking error of a reference track in a third reference region with respect to the signal from the same position sensor. This tracking error is used to determine the tracking error of other reference tracks in the third reference region with respect to the signals from other of the position sensors. The tracking error of the reference tracks is then used to determine the tracking error of the data tracks on the disc. The present invention also provides a disc drive apparatus having an automatic seek time adjustment. A predetermined number of tracks is moved through based on a set head velocity. The seek time is compared to a prescribed seek time. If the two times differ, the velocity is adjusted until the prescribed seek time is achieved.

REFERENCES:
patent: 4502082 (1985-02-01), Ragle et al.
patent: 4797752 (1989-01-01), Giddings
patent: 5050146 (1991-09-01), Richgels et al.

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