发明名称 |
Storage apparatus, control method, control device, and program which can control flying height of head accurate |
摘要 |
An amplitude measurement unit measures an amplitude of a read signal from a preamble unit in a servo area of a predetermined frame number m per one rotation of the recording medium for a predetermined cycle number n while increasing an electric power amount distributed to the heater in the state in which the head is positioned to a track on the recording medium, and a mean amplitude calculating unit calculates a mean amplitude from an amplitude measurement value which is measured by the number which is the frame number m multiplied by the cycle number n. A contact determination unit calculates a mean amplitude variation amount per a unit heater electric power amount as a contact determination value, and determines that the head is in contact with the recording medium when the contact determination value is lower than a predetermined threshold value, and a flying height calculating unit which calculates a flying height of the head with respect to the surface of the recording medium from the heater electric power amount at the point when contact is determined.
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申请公布号 |
US7468854(B2) |
申请公布日期 |
2008.12.23 |
申请号 |
US20060645189 |
申请日期 |
2006.12.22 |
申请人 |
FUJITSU LIMITED |
发明人 |
YAMASHITA SATOSHI;SAITOU SYUNJI;ABE YUKIO;YANAGI SHIGENORI |
分类号 |
G11B21/02;G11B5/00 |
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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