Magnetic disc storage apparatus

Details Magnetic disc storage apparatus Magnetic disc storage apparatus

2005-12-13

2005-12-13

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S078040

Reexamination Certificate

active

06975479

ABSTRACT:
There is provided a technique for controlling drive of a voice coil motor which can select, with priority for effective reduction, any one of heat generation and EMI noise which are presumed to induce a read/write error and for simultaneously realizing the positioning control of magnetic head with higher accuracy during the tracking operation and the high speed access with shortening of the seek operation period. The magnetic disc storage apparatus introducing this technique is provided with a mode to drive with linear control a coil of the voice coil motor from both terminals and a mode to drive one terminal of coil with linear control and the other terminal with pulse width control. Thereby, the coil is driven in the drive mode of linear control during the tracking operation, while one terminal of coil is driven with linear control and the other terminal with pulse width control during the seek operation.

REFERENCES:
patent: 5838515 (1998-11-01), Mortazavi et al.
patent: 6021015 (2000-02-01), Jeffrey et al.
patent: 6501609 (2002-12-01), Saito et al.
patent: 2002/0071199 (2002-06-01), Kokami et al.
patent: 9-121591 (1997-05-01), None
patent: 11-122954 (1999-04-01), None

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