Method for restoring track 0

Details Method for restoring track 0 Method for restoring track 0

1988-12-28

1989-11-28

Faber, Alan

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7708, 360 7808, 360 7813, 360 75, 318685, G11B 555, G11B 5596

Patent

active

048841528

ABSTRACT:
A method for restoring the head to the track 0 in a disk drive unit which utilizes a stepping motor to position the head, the method comprising positioning the head to a position outside track 0 by exciting the stepping motor; returning the head thereafter toward an inner side to detect a position where the track 0 is found wihin a cycle of an excitation phase of the stepping motor; positioning the head at a position separated from the outer-most track 0 by a preset number of steps; and then controlling a current ratio to effect an excitation on a preset excitation phase, thereby positioning the head to the position over the track 0.

REFERENCES:
patent: 4086636 (1978-04-01), Cizmic et al.
patent: 4581567 (1986-04-01), Yanagawa
patent: 4600868 (1986-07-01), Bryant
patent: 4620244 (1986-10-01), Krause
patent: 4683504 (1987-07-01), Cantello et al.
patent: 4685007 (1987-08-01), Nazarian et al.

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