Invention Grant
- Patent Title: Disk drive determining touchdown threshold
- Patent Title (中): 磁盘驱动器确定触地降门限
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Application No.: US13100897Application Date: 2011-05-04
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Publication No.: US09053740B1Publication Date: 2015-06-09
- Inventor: Abhimanyu Sharma , Galvin T. Chia , Noureddine Kermiche
- Applicant: Abhimanyu Sharma , Galvin T. Chia , Noureddine Kermiche
- Applicant Address: US CA Irvine
- Assignee: Western Digital Technologies, Inc.
- Current Assignee: Western Digital Technologies, Inc.
- Current Assignee Address: US CA Irvine
- Main IPC: G11B21/02
- IPC: G11B21/02
Abstract:
A disk drive is disclosed comprising a head actuated over a disk, and a dynamic fly height (DFH) actuator for controlling a fly height of the head over the disk in response to a DFH setting. A touchdown (TD) threshold is initialized, and the DFH setting that causes a TD signal to exceed the TD threshold is determined. The TD threshold is adjusted, and the DFH setting that causes the TD signal to exceed the adjusted TD threshold is determined. A slope of the DFH setting relative to the TD threshold is determined, and an operating TD threshold is determined in response to a change in the slope.
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