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US 2009/0153996 A1Published application
Using servo data harmonics to monitor head-medium spacing
AssigneeSeagate Technology LLC
InventorTimothy Francis Ellis
Life of this patent
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Abstract
A method is disclosed that includes measuring a first amplitude and a second amplitude in a servo pattern signal derived from a transducer head interacting with a medium; and providing an indication of a change in a spacing distance between the head and the medium, wherein the change in the spacing is evaluated using a spacing relation derived from a ratio of the first harmonic amplitude and the second harmonic amplitude.
Claims20
A method comprising:
- measuring a first amplitude and a second amplitude in a servo pattern signal derived from a transducer head interacting with a medium;
- and
- providing an indication of a change in a spacing distance between the head and the medium, wherein the change in the spacing is evaluated using a spacing relation derived from a ratio of the first amplitude and the second amplitude.
A method comprising:
- measuring an odd harmonic amplitude and an even harmonic amplitude in a servo pattern signal derived from a transducer head interacting with a medium;
- evaluating a spacing distance between the head and the medium using a spacing relation in which the spacing distance is proportional to a natural logarithm of a ratio between the odd harmonic amplitude and the even harmonic amplitude;
- and
- providing a signal that indicates the spacing distance.
1 more element
A device comprising:
- a data storage medium;
- a transducer head, translatably disposed in proximity to the data storage medium;
- and
- a controller, communicatively connected with the head, wherein the controller is configured to measure an even amplitude and an odd amplitude in a servo pattern signal derived from the transducer head interacting with the data storage medium, and the controller is further configured to evaluate a spacing distance between the head and the medium as a spacing relation of the even amplitude and the odd amplitude.
1 more element
Dependencies are inferred from the claim text.