Invention Grant
US08970978B1 Disk drive detecting head touchdown by applying DC+AC control signal to fly height actuator
有权
通过将DC + AC控制信号应用于飞行高度执行器，磁盘驱动器检测头接地
- Patent Title: Disk drive detecting head touchdown by applying DC+AC control signal to fly height actuator
- Patent Title (中): 通过将DC + AC控制信号应用于飞行高度执行器，磁盘驱动器检测头接地
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Application No.: US13657016Application Date: 2012-10-22
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Publication No.: US08970978B1Publication Date: 2015-03-03
- Inventor: Bernhard E. Knigge , Stanley H. Shepherd , Noureddine Kermiche
- Applicant: Western Digital Technologies, Inc.
- Applicant Address: US CA Irvine
- Assignee: Western Digital Technologies, Inc.
- Current Assignee: Western Digital Technologies, Inc.
- Current Assignee Address: US CA Irvine
- Main IPC: G11B5/60
- IPC: G11B5/60
Abstract:
A disk drive is disclosed comprising a head actuated over a disk, and a dynamic fly height (DFH) actuator operable to control a fly height of the head over the disk. A DFH control signal is applied to the DFH actuator to decrease the fly height of the head, wherein the DFH control signal comprises a DC component and an AC component comprising an excitation frequency. A touchdown metric is measured over an interval, and the head contacting the disk is detected in response to a frequency component of the touchdown metric at the excitation frequency.
Public/Granted literature
- US1342917A Multiple-process chilian mill Public/Granted day:1920-06-08
Information query
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