发明申请
US20080212226A1 Disk drive device, altitude determination method therefore and method for determining characteristic of head element portion
有权
因此，磁盘驱动装置，高度确定方法以及用于确定磁头元件部分特性的方法
- 专利标题： Disk drive device, altitude determination method therefore and method for determining characteristic of head element portion
- 专利标题（中）： 因此，磁盘驱动装置，高度确定方法以及用于确定磁头元件部分特性的方法
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申请号： US12012340申请日： 2008-01-31
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公开(公告)号： US20080212226A1公开(公告)日： 2008-09-04
- 发明人: Yoshiaki Uji , Minoru Shimada , Ryoh Miura , Takahiro Watanabe , Toyomi Ohsawa , Noriaki Satoh
- 申请人： Yoshiaki Uji , Minoru Shimada , Ryoh Miura , Takahiro Watanabe , Toyomi Ohsawa , Noriaki Satoh
- 优先权： JP2007-022455 20070131
- 主分类号： G11B5/54
- IPC分类号： G11B5/54
摘要：
Embodiments of the present invention allow for a precise altitude to be calculated from read-out signals of a head slider. In one embodiment, a hard disk controller/multiprocessing unit (HDC/MPU) determines a head element portion in which the instability has occurred in accordance with the resolution change. The HDC/MPU adjusts the clearance accordingly. The head element portion reads signals of different frequencies under a condition of the signal strengths coinciding with a reference value, and the HDC/MPU calculates the resolution. The HDC/MPU determines that the instability has occurred if the difference is outside the criterion. The HDC/MPU uses the read-out signal of a head slider in which the instability has not occurred to calculate the altitude.