Disk drive calibrating VCM notch filter by increasing the...

Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head

Reexamination Certificate

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Details

C360S031000, C360S077020, C360S078040

Reexamination Certificate

active

07864482

ABSTRACT:
A disk drive is disclosed comprising a disk, a head, a voice coil motor (VCM) for actuating the head over the disk, and control circuitry comprising a notch filter for generating a VCM control signal, wherein a notch of the notch filter comprises a frequency, a width, and a depth. The notch filter is calibrated by initializing at least one of the width and the depth of the notch, measuring a quality metric of the notch filter, and increasing at least one of the width and the depth of the notch until the quality metric indicates good performance.

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