Method of detecting the touch-down of a head, method of adjusting a head flying height using the method of detecting the touch-down of the head, and disk drive using the method of detecting the touch-down of the head
AssigneeSamsung Electronics Co., Ltd.
InventorWon-choul YANG
Life of this patent
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Abstract
A method of detecting a touch-down of a head in a disk drive, a method of adjusting a head flying height by using the method of detecting a touch-down of a head, and a disk drive using the method of detecting a touch-down of a head detect a change of an electrical characteristic of a sensor installed in a slider, wherein the electrical characteristic changes according to temperature; and determines that the head flying height reached a touch-down flying height if the detected change of the electrical characteristic satisfies a threshold condition.
Claims20
A method of detecting a touch-down of a head on a rotating disk, the method comprising:
- detecting a change of an electrical characteristic of a sensor installed in a slider, wherein the electrical characteristic changes according to temperature;
- and
- determining that the head flying height has reached a touch-down flying height if the detected change of the electric characteristic satisfies a threshold condition.
A method of adjusting a head flying height on a rotating disk, the method comprising:
- changing a value of a first signal for adjusting the head flying height on the rotating disk and calculating a magnetic space changing amount profile between the head and the rotating disk according to the change of the value of the first signal;
- detecting a change of an electrical characteristic of a sensor installed in a slider, wherein the electrical characteristic changes according to temperature, and determining a point of time when the head touches down on the rotating disk based on the detected change of the electrical characteristic;
- and
- determining a value of the first signal corresponding to a target flying height from the calculated magnetic space changing amount profile between the head and the rotating disk based on a value of the first signal at the determined point of time when the head touches down the rotating disk.
A disk drive comprising:
- a disk for storing information;
- a slider in which a heater, a sensor having an electrical characteristic that changes according to temperature, and a head for recording information on the disk or reading information from the disk are installed;
- and
- a controller for detecting a change of the electrical characteristic of the sensor according to a change of a value of a first signal for adjusting power supplied to the heater, and for controlling a head flying height by determining a point of time when the head touches down on the disk based on the detected change of the electrical characteristic of the sensor.
(canceled)
Dependencies are inferred from the claim text.