发明名称 |
HEAD POSITION CONTROL METHOD AND DISK DEVICE |
摘要 |
A track locus drawn on a disk discretely contains repeatable runout (RRO) components which are large in amplitude up to high-frequency band. In order to position a magnetic head along the track locus using filters good at suppressing RRO with resonance characteristics only at an integral multiple of a rotation frequency, many filters are required and thus it takes a long time for all the filters to go into a steady state. After learning until the filers go into a steady state, output values of the filters in a steady state are stored on a disk or in a memory. According to controlling the magnet head using these stored output values, the time required for the filters to go into a steady state becomes unnecessary.
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申请公布号 |
US2012106000(A1) |
申请公布日期 |
2012.05.03 |
申请号 |
US201013266524 |
申请日期 |
2010.04.02 |
申请人 |
NOSAKI SHUYA;ATSUMI TAKENORI;HITACHI, LTD. |
发明人 |
NOSAKI SHUYA;ATSUMI TAKENORI |
分类号 |
G11B21/02 |
主分类号 |
G11B21/02 |
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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