Control value setting method of thermal actuator for magnetic disk device
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorToru Watanabe
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Abstract
According to one embodiment, curve fitting, which uses power supplied to the thermal actuator when a magnetic head is brought into contact with a magnetic disk by the thermal actuator and a quadratic or higher curve, is performed at at least five radial positions in a radial direction of the magnetic disk in a case of setting a control value of the thermal actuator, and it is determined as abnormal contact detection when a Z value of an RMS of a fitting residual from the quadratic or higher curve of each power exceeds a predetermined value.
Claims6
A control value setting method of a thermal actuator for a magnetic disk device, the method comprising:
- performing curve fitting by a control unit of the magnetic disk device, which uses power supplied to the thermal actuator when a magnetic head is brought into contact with a magnetic disk by the thermal actuator and a quadratic or higher function, at least five radial positions in a radial direction of the magnetic disk in a case of setting a control value of the thermal actuator;
- and
- determining the performance as abnormal contact detection by the control unit when a Z value of an RMS of a fitting residual from the quadratic or higher function of each power exceeds a predetermined value.
Dependencies are inferred from the claim text.