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US 12,525,252 B2Granted
Magnetic disk device
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorMasaya Takaesu
Life of this patent
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Abstract
According to one embodiment, a magnetic disk device includes a rotatable disk-shaped recording medium including a plurality of concentric recording tracks, a magnetic head including a write element which writes data to the recording tracks, a heating element, and a sensor which detects a surface condition of the recording medium, and a controller including an inspection circuit which detects, based on an sensor output of the sensor, presence or absence of a bump on a surface of the recording medium, a height and a width of the bump, and a memory which records the detected height and width of the bump.
Claims8
A magnetic disk device comprising:
- a rotatable disk-shaped recording medium including a plurality of concentric recording tracks;
- a magnetic head comprising a write element which writes data to the recording tracks, a heating element, and a sensor which detects a surface condition of the recording medium;
- and
- a controller comprising an inspection circuit which detects, based on an sensor output of the sensor, presence or absence of a bump on a surface of the recording medium, a height and a width of the bump, and a memory which records the detected height and width of the bump, wherein
- the controller sets a track on which the bump exists and several tracks located on both sides of the track in a radial direction as recording inhibit tracks and registers these in the memory, and
- the recording inhibit tracks vary in number according to the height of the bump.
3 more elements
A magnetic disk device comprising:
- a plurality of rotatable disk-shaped recording media, each rotatable disk-shaped recording medium including a plurality of concentric recording tracks;
- a magnetic head comprising a write element which writes data to the recording tracks, a heating element, and a sensor which detects a surface condition of the recording medium;
- and
- a controller comprising an inspection circuit which detects, based on a sensor output of the sensor, presence or absence of a bump on a surface of the recording medium, a height and a width of the bump, and a memory which records the detected height and width of the bump,
- wherein the controller includes a determination circuit which determines the height of the bump registered in the memory, and
- the controller sets, when a bump is determined to be higher than a specified value by the determination circuit, a plurality of recording inhibit tracks around the bump and sets a plurality of tracks at a same radius location as that of the plurality of recording inhibit tracks in all other recording media as recording inhibit tracks.
3 more elements
A magnetic disk device comprising:
- a rotatable disk-shaped recording medium including a plurality of concentric recording tracks;
- a magnetic head comprising a write element which writes data to the recording tracks, a heating element, and a sensor which detects a surface condition of the recording medium;
- and
- a controller comprising an inspection circuit which detects, based on a sensor output of the sensor, presence or absence of a bump on a surface of the recording medium, a height and a width of the bump, and a memory which records the detected height and width of the bump, wherein
- the controller includes a determination circuit which determines the height of the bump registered in the memory, and
- the controller inhibits, when a bump is determined to be higher than a specified value by the determination circuit, use of the magnetic head corresponding to the recording medium in which the bump exists.
3 more elements
A magnetic disk device comprising:
- a rotatable disk-shaped recording medium including a plurality of concentric recording tracks;
- a magnetic head comprising a write element which writes data to the recording tracks, a heating element, and a sensor which detects a surface condition of the recording medium;
- and
- a controller comprising an inspection circuit which detects, based on a sensor output of the sensor, presence or absence of a bump on a surface of the recording medium, a height and a width of the bump, and a memory which records the detected height and width of the bump, wherein
- the controller includes a determination circuit which determines the height of the bump registered in the memory and a heating element control unit which controls a power supply voltage supplied to the heating element,
- the determination circuit determines presence or absence of a bump which affect control of an amount of flying of the magnetic head in a seek zone, and
- the controller executes, when the determination circuit determines that there is no bump which affects the control of the flying amount of the magnetic head, the seek of the magnetic head without changing a drive voltage on the heating element.
4 more elements
Dependencies are inferred from the claim text.