Disk device
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorToru Watanabe
Life of this patent
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Abstract
According to one embodiment, a disk device includes a disk-shaped recording medium, a magnetic head including a write head, a read head, and a heater, and a controller including a reference signal generator outputting a reference signal having a constant voltage amplitude at the same frequency as a high-frequency component of a gap measurement signal recorded in the recording medium, a measurer measuring a component amplitude of a reproduced signal of the gap measurement signal and an amplitude of the reference signal, and a heater controller controlling a power value of heater power supplied to the heater based on the measured values of the component amplitude and the amplitude of the reference signal.
Claims7
A disk device comprising:
- a disk-shaped recording medium on which a gap measurement signal containing a high-frequency component is recorded;
- a magnetic head comprising a write head, a read head, and a heater to adjust a gap between the recording medium and the magnetic head;
- and
- a controller including a reference signal generator outputting a reference signal having a constant voltage amplitude at the same frequency as the high-frequency component, a measurer measuring a component amplitude of a reproduced signal of the gap measurement signal and an amplitude of the reference signal, and a heater controller controlling a power value of heater power supplied to the heater based on the measured values of the component amplitude and the amplitude of the reference signal;
- wherein
- the controller calculates an amount of change in the gap based on a ratio between an initial value of a component amplitude of the reproduced signal measured in a state where the magnetic head is in contact with the recording medium and a measured value of a component amplitude of the reproduced signal measured in the state where the gap is generated, and a ratio between an initial value of the amplitude of the reference signal and the measured value of the amplitude of the reference signal.
A disk device comprising:
- a disk-shaped recording medium on which a gap measurement signal containing a high-frequency component is recorded;
- a magnetic head comprising a write head, a read head, and a heater to adjust a gap between the recording medium and the magnetic head;
- and
- a controller including a reference signal generator outputting a reference signal having a constant voltage amplitude at the same frequency as the high-frequency component, a measurer measuring a component amplitude of a reproduced signal of the gap measurement signal and an amplitude of the reference signal, and a heater controller controlling a power value of heater power supplied to the heater based on the measure values of the component amplitude and the amplitude of the reference signal;
- wherein
- the gap measurement signal includes a signal pattern in which a third-order component amplitude of a reproduced signal is larger than a first-order component amplitude of a reproduced signal, and the controller controls the power value of the heater power based on the amount of change in the third-order component amplitude.
Dependencies are inferred from the claim text.