发明名称 |
HARMONIC MEASUREMENT FOR HEAD-DISK SPACING CONTROL USING USER DATA |
摘要 |
A hard disk drive that determines a flying height from a ratio of a first harmonic transfer function and a third harmonic transfer function. The transfer functions can be determined from a response to an impulse function. The impulse function (also known as an impulse response) can be a playback waveform de-convolved by channel data sequence. Any change in the ratio of the first and third harmonic transfer functions corresponds to a change in the flying height. The disk drive may utilize the transfer function ratios in a feedback routine to control the flying height.
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申请公布号 |
US2010128399(A1) |
申请公布日期 |
2010.05.27 |
申请号 |
US20080323367 |
申请日期 |
2008.11.25 |
申请人 |
CHE CARL XIAODONG;TANG YAWSHING;LEE HAEJUNG |
发明人 |
CHE CARL XIAODONG;TANG YAWSHING;LEE HAEJUNG |
分类号 |
G11B21/24 |
主分类号 |
G11B21/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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