Proximity detection method for magnetic head and recording...

Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording

Reexamination Certificate

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C360S075000

Reexamination Certificate

active

07990641

ABSTRACT:
Touchdown is detected between an R/W head and disk by determining the variance in the frequency domain of a baseline position error signal (PES) and a PES measured after incrementally increasing the DFH control signal. To quantify the variance in the frequency domain, a discrete Fourier transform of the baseline PES and of each PES produced for a given DFH control signal is used. A band-limited PES variance is used to improve touchdown detection, but is not a requirement of this method.

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Tang, et al. “Overview of Fly Height Control Applications in Perpendicular Magnetic Recording,” IEEE Transactions on Magnetics, vol. 43, No. 2, Feb. 2007, pp. 709-714.

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