Magnetic disk device and contact detecting method of the magnetic disk device
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorMasayuki Kondo
Life of this patent
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Abstract
According to one embodiment, a magnetic disk device includes a magnetic disk, a magnetic head including a read head, a write head, a heater and the magnetic head, and a sensor and the control section. The control section when applying electric power to the heater, the control section predicts, on the basis of a relationship between a value of the electric power to be applied to the heater and an output value of a spectrum at a pulse frequency of a DC output of the sensor in a state where pulsed electric power is applied to the heater, the output value of the spectrum, and detects contact between the magnetic head and the magnetic disk before the predicted output value of the spectrum becomes less than or equal to a threshold.
Claims8
A magnetic disk device comprising:
- a magnetic disk;
- a magnetic head including a read head configured to read data from the magnetic disk, a write head configured to write data to the magnetic disk, a heater configured to adjust a distance between the magnetic disk and the magnetic head, and a sensor configured to detect the distance;
- and
- a control section configured to adjust the distance by applying electric power to the heater, wherein
- when applying electric power to the heater, the control section predicts, on the basis of a relationship between a value of the electric power to be applied to the heater and an output value of a spectrum at a pulse frequency of a DC output of the sensor in a state where pulsed electric power is applied to the heater, the output value of the spectrum, and detects contact between the magnetic head and the magnetic disk before the predicted output value of the spectrum becomes less than or equal to a threshold.
A magnetic disk device comprising:
- a magnetic disk;
- a magnetic head including a read head configured to read data from the magnetic disk, a write head configured to write data to the magnetic disk, a heater configured to adjust a distance between the magnetic disk and the magnetic head, and a sensor configured to detect the distance;
- and
- a control section configured to adjust the distance by applying electric power to the heater, wherein
- when applying electric power to the heater, the control section determines the electric power value of the heater at which the magnetic head and the magnetic disk come into contact with each other on the basis of a change in the value of the electric power to be applied to the heater and a change in the output value of the spectrum at the pulse frequency of the DC output of the sensor in the state where pulsed electric power is applied to the heater.
A contact detecting method of a magnetic disk device including
- a magnetic disk,
- a magnetic head including a read head configured to read data from the magnetic disk, a write head configured to write data to the magnetic disk, a heater configured to adjust a distance between the magnetic disk and the magnetic head, and a sensor configured to detect the distance, and
- a control section configured to adjust the distance by applying electric power to the heater, comprising:
- when electric power is applied to the heater by the control section,
- predicting, on the basis of a relationship between a value of the electric power to be applied to the heater and an output value of a spectrum at a pulse frequency of a DC output of the sensor in a state where pulsed electric power is applied to the heater, the output value of the spectrum, and
- detecting contact between the magnetic head and the magnetic disk before the predicted output value of the spectrum becomes less than or equal to a threshold.
Dependencies are inferred from the claim text.