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Demagnetizing a head in a disk drive by increasing the frequency of an AC write signal while maintaining the write current amplitude
Demagnetizing a head in a disk drive by increasing the frequency of an AC write signal while maintaining the write current amplitude
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机译:通过在保持写入电流幅度的同时增加交流写入信号的频率来使磁盘驱动器中的磁头消磁
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摘要
A disk drive is disclosed which demagnetizes the head after a write operation. Write circuitry applies a write signal to the head in order to write data to a selected data sector during a write operation, wherein the write signal comprises a predetermined write current amplitude. Control circuitry demagnetizes the head at the end of the write operation by maintaining the write current amplitude while increasing a frequency of an AC write signal applied to the head over a predetermined demagnetization interval, wherein increasing the frequency of the AC write signal decreases an amplitude of the AC write signal when observed at the head.
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