Magnetic disk device and method for detecting floating amount of magnetic head

By introducing a controller into the disk device, the change in the measured value is detected and corrected based on the correspondence between the change in the power of the heater and the measured value of the up-water measurement unit, the problem of up-water measurement deviation under the influence of thermal fluctuations and temperature characteristics is solved, and the accurate detection and adjustment of the up-water measurement amount of the magnetic head is realized.

CN119673222APending Publication Date: 2025-03-21KK TOSHIBA +1
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Patent Information

Application Number
CN202311671288.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-09-21
Filing Date
2023-12-07
Publication Date
2025-03-21

AI Technical Summary

Technical Problem

When detecting the upflow of the magnetic head, existing disk devices are susceptible to thermal fluctuations and temperature characteristics, resulting in deviations in the measured value and the upflow of the magnetic head cannot be accurately adjusted.

Method used

By introducing a controller into the magnetic disk device, the change in the measured value is detected and corrected based on the correspondence between the change in the power of the heater and the measured value of the up-float measurement unit to ensure that the detection result is not affected by heat fluctuations and temperature characteristics.

Benefits of technology

It is possible to accurately detect the upflow amount of the magnetic head without being affected by thermal fluctuations and temperature characteristics to ensure that the upflow amount of the magnetic head can be adjusted to the optimal state.

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Abstract

The invention provides a magnetic disk device and a method for detecting the floating amount of a magnetic head, which can accurately detect the floating amount of the magnetic head without being influenced by thermal fluctuation and temperature characteristics. A magnetic disk device according to an embodiment includes: a magnetic head that performs data writing and data reading on a magnetic disk, includes a heater that generates heat by supplied power, and expands toward the magnetic disk side by the heat generated by the heater; a floating amount measurement unit that measures a floating amount of the magnetic head on the basis of a read signal of the magnetic head with respect to floating amount measurement data written into the magnetic disk; and a controller that controls the supply of power to the heater. And a controller that detects a variation in the measurement value of the floating amount measurement unit on the basis of a variation in the correspondence between the amount of change in the supplied power and the measurement value of the floating amount measurement unit.
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