Method and apparatus for thermal calibration of hard disk drive

Details Method and apparatus for thermal calibration of hard disk drive Method and apparatus for thermal calibration of hard disk drive

1995-10-06

1996-06-04

Epps, Georgia Y.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7705, G11B 5596

Patent

active

055238998

ABSTRACT:
A method and apparatus for optimizing positional data for use in connection with a hard disk type magnetic memory storage device. The apparatus includes a pattern encoded on a dedicated track of the hard disk including first and second set of signals repetitively encoded in a series of cells. The method includes the steps of periodically accessing the dedicated track with the read/write head and calculating amplitude and phase information for a trigonometric instantaneous correction function. Amplitude and phase information are subsequently stored and the positional signal for the read/write head is continually modified by a most recent determination of the correction function. The apparatus of the present invention includes circuitry for distinguishing between sub-elements of the repetitive pattern on the hard disk.

REFERENCES:
patent: 4205338 (1980-05-01), Schaefer
patent: 4454549 (1984-06-01), Pennington
patent: 4633345 (1986-12-01), Keener
patent: 4745497 (1988-05-01), Ozawa
patent: 4789909 (1988-12-01), Moteki
patent: 4967292 (1990-10-01), Moteki
patent: 5005089 (1991-04-01), Thanos et al.
patent: 5040084 (1991-08-01), Liu

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