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US 8,711,508 B2Granted
Contact detection between a disk and magnetic head
AssigneeHGST Netherlands B.V.
InventorsMasayuki Kurita, Toshiya Shiramatsu, Yuki Shimizu
Life of this patent
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Abstract
A HDD including a magnetic disk, a magnetic head, an embedded contact sensor embedded in the magnetic head and configured to detect a contact between the magnetic disk and the magnetic head, and TFC embedded in the magnetic head and configured to facilitate in detecting the contact between the magnetic disk and said magnetic head.
Claims11
A hard disk drive (HDD) comprising:
- a magnetic disk;
- a magnetic head;
- an embedded contact sensor (ECS) embedded in said magnetic head and configured to detect a contact between said magnetic disk and said magnetic head;
- and
- a thermal fly height control (TFC) embedded in said magnetic head and configured to facilitate in detecting said contact between said magnetic disk and said magnetic head, wherein in response to detecting said contact based on said TFC and not on said ECS, deeming said contact as pseudo contact between said magnetic disk and said magnetic head.
2 more elements
A method for contact detection, said method comprising:
- performing detection of a contact between a magnetic disk and a magnetic head based, in part, on a thermal fly height control (TFC);
- performing detection of said contact between said magnetic disk and said magnetic head based on an embedded contact sensor (ECS);
- in response to detecting said contact based on said TFC and said ECS, deeming said contact as true contact between said magnetic disk and said magnetic head;
- and
- in response to detecting said contact based on said TFC and not on said ECS, deeming said contact as pseudo contact between said magnetic disk and said magnetic head.
2 more elements
A method for burnishing, said method comprising:
- in response to detecting a contact between a magnetic disk and a magnetic head based on a thermal fly height control (TFC) and not based on an embedded contact sensor (ECS) disposed in said magnetic head, burnishing said magnetic head to remove an air bearing surface (ABS) fence.
Dependencies are inferred from the claim text.