Magnetic head driving circuit and magnetic disk device

Details Magnetic head driving circuit and magnetic disk device Magnetic head driving circuit and magnetic disk device

2007-05-22

2007-05-22

Sniezek, Andrew L. (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

C360S068000, C360S075000

Reexamination Certificate

active

11068777

ABSTRACT:
The invention is directed to a magnetic head driving circuit and a magnetic disk device which achieve a low flying-height with thermal protrusion and thus a reliable write operation on the magnetic disk. The write circuit3receives the write data signal Sw inputted therein, and generates and outputs the write voltages Wx, Wy based upon the inputted signal. The write voltages Wx, Wy are composed of a preamble portion T1, a sink mark T2and a user data portion T3in each sector for magnetic recording. In the write voltage, the frequency f2 of the signal in the preamble portion T1is higher than half the frequency f1 of the signal in the user data portion T3.

REFERENCES:
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patent: 5991113 (1999-11-01), Meyer et al.
patent: 2002/0141094 (2002-10-01), Suzuki et al.
patent: 2005/0046985 (2005-03-01), Morinaga et al.
patent: 4-366408 (1992-12-01), None
patent: 64-27079 (1999-01-01), None
patent: 2001-56902 (2001-02-01), None
patent: 2003-157505 (2003-05-01), None

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