Systems and methods for Nyquist tone harmonic measurements

Details Systems and methods for Nyquist tone harmonic measurements Systems and methods for Nyquist tone harmonic measurements

2011-01-18

2011-01-18

Wong, K. (Department: 2627)

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C360S075000

Reexamination Certificate

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07872821

ABSTRACT:
Various embodiments of the present invention provide systems and methods for determining changes in fly-height. For example, various embodiments of the present invention provide storage devices that include a storage medium, an offset frequency, a read/write head assembly, and a harmonic fly-height change detection circuit. The storage medium includes a periodic data pattern that repeats at a data frequency. The read/write head assembly disposed in relation to the storage medium such that it senses the periodic data pattern and provides a sensed periodic data pattern. The harmonic fly-height change detection circuit samples the sensed periodic data pattern at an aggregate frequency to yield a first set of samples and a second set of samples. The aggregate frequency is the data frequency adjusted by the offset frequency. The harmonic fly-height change detection circuit calculates a first magnitude of the first set of samples and a second magnitude of the second set of samples.

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