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US 9,177,599 B1Granted
Non-contact fly height calibration and compensation
AssigneeSeagate Technology LLC
InventorsClifford Jayson Bringas Camalig, ChengYi Guo, Mui Chong Chai, Victor Chew Weng Khin, Lim TeckKhoon
Life of this patent
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Abstract
Calibration and calculation of thermal clearance compensation of a head in a storage device without causing contact between the head and a storage medium. The thermal clearance compensation may be configured to compensate for any changing fly height of the head of the storage device during different temperature conditions based on high and low temperature signal data.
Claims18
A system comprising:
- a computing apparatus configured to be coupled to one or more storage devices, each storage device comprising a storage medium and a head configured to write and read data from the storage medium, the computing apparatus configured to perform a fly height calibration without contacting the head to the storage medium during testing and calibration of the storage device prior to and not when using thermal clearance compensation to compensate for fly height change during different temperature conditions, and to perform the fly height calibration, the computing apparatus is further configured to:
- write a selected pattern to the storage medium using the head of at least one storage device;
- read the selected pattern from the storage medium using the head without contacting the head to the storage medium during a high temperature condition resulting in high temperature signal data;
- read the selected pattern from the storage medium using the head without contacting the head to the storage medium during a low temperature condition resulting in low temperature signal data;
- and calculate thermal clearance compensation for the head based on the high and low temperature signal data, the thermal clearance compensation configured to compensate for fly height change of the head during different temperature conditions.
2 more elements
A method comprising:
- providing a storage device comprising a storage medium and a head associated with the storage medium;
- and performing a non-contact fly height calibration without contacting the head to the storage medium during testing and calibration of the storage device prior to and not when using the thermal clearance compensation to compensate for fly height change during different temperature conditions and performing the non-contact fly height calibration comprises:
- writing a selected pattern to the storage medium using the head;
- reading the selected pattern from the storage medium using the head without contacting the head to the storage medium during a high temperature condition resulting in high temperature signal data;
- reading the selected pattern from the storage medium using the head without contacting the head to the storage medium during a low temperature condition resulting in low temperature signal data;
- and calculating thermal clearance compensation for the head based on the high and low temperature signal data, the thermal clearance compensation configured to compensate for fly height changes of the head.
3 more elements
A storage device comprising:
- a storage medium and a head configured to write data to and read data from the storage medium;
- and
- a processor operably coupled to the head and configured to compensate for fly height change during different temperature conditions based on thermal clearance compensation, wherein the thermal clearance compensation is calculated without contacting the head to the storage medium during a non-contact fly height calibration and testing of the storage device prior to and not when using the thermal clearance compensation to compensate for fly height change during different temperature conditions.
Dependencies are inferred from the claim text.