Disk drive disabling BEMF detection window to reduce...

Details Disk drive disabling BEMF detection window to reduce... Disk drive disabling BEMF detection window to reduce...

2005-10-11

2005-10-11

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

C360S073010

Reexamination Certificate

active

06954324

ABSTRACT:
A disk drive is disclosed employing either back electromotive force (BEMF) spindle speed control mode or wedge spindle speed control mode. A BEMF detector monitors the BEMF voltage generated by the windings of the spindle motor to generate a BEMF speed error. The BEMF spindle speed control mode is used to spin up the disk to an operating speed, and the wedge spindle speed control to maintain the disk at the operating speed. While in the wedge spindle speed control mode, a BEMF detection window is disabled to reduce acoustic noise.

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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