Disk drive employing BEMF spindle speed control or wedge...

Details Disk drive employing BEMF spindle speed control or wedge... Disk drive employing BEMF spindle speed control or wedge...

2005-07-05

2005-07-05

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

C360S073010

Reexamination Certificate

active

06914740

ABSTRACT:
A disk drive is disclosed employing either back electromotive force (BEMF) spindle speed control or wedge spindle speed control. The BEMF spindle speed control is used to calibrate a reference time period representing an accumulation of a predetermined number of wedge-to-wedge times. During wedge spindle speed control, a wedge time period representing an accumulation of a predetermined number of wedge-to-wedge times is measured, and a wedge speed error is computed as the difference between the reference time period and the wedge time period.

REFERENCES:
patent: 5038232 (1991-08-01), Grace
patent: 5218491 (1993-06-01), Nishida et al.
patent: 6067202 (2000-05-01), Rowan et al.
patent: 6754025 (2004-06-01), Shepherd et al.
patent: 2004/0245950 (2004-12-01), Ang et al.

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