Disc drive head bias current optimization

Details Disc drive head bias current optimization Disc drive head bias current optimization

1998-03-18

2000-09-05

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

G11B 503

Patent

active

061152013

ABSTRACT:
An apparatus and method are disclosed for determining a maximum magnitude of bias current that can be safely applied to a head of a disc drive. The disc drive comprises a head disposed adjacent a rotatable disc having a recording surface on which data are magnetically stored, a preamplifier circuit which selectively applies bias currents to the head, and a head bias current selection circuit, operably coupled to the preamplifier circuit, which first determines the maximum magnitude of bias current that can be applied to the head in relation to a maximum power dissipation rating of the head and voltage measured across the head when at least one initial bias current of selected magnitude is applied to the head. Thereafter, a range of bias currents having different magnitudes less than or equal to the maximum magnitude are selected and evaluated to select an optimum magnitude for subsequent use by the drive.

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