Flying height modulation estimation from pseudorandom readback signal in disk drives

In drive testing, pseudorandom data is very often used to avoid biasing results to a particular pattern, e.g., constant frequency. Using the readback signal to measure flying height modulation (FHM) is the most convenient method, but available methods need a special data pattern. In this paper, we p...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2003-09, Vol.39 (5), p.2417-2419
Main Authors: Qing-Hua Zeng, Chen, M.
Format: Article
Language:English
Subjects:
Applied sciences
Disk drives
Electronics
Exact sciences and technology
Frequency
Magnetic and optical mass memories
Magnetic modulators
Magnetic recording
Magnetism
Optical pulses
Other magnetic recording and storage devices (including tapes, disks, and drums)
Pulse measurements
Space vector pulse width modulation
Storage and reproduction of information
Testing
Vibrometers
Writing
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Summary:In drive testing, pseudorandom data is very often used to avoid biasing results to a particular pattern, e.g., constant frequency. Using the readback signal to measure flying height modulation (FHM) is the most convenient method, but available methods need a special data pattern. In this paper, we present a method that can be used to measure FHM from a pseudorandom readback signal. The method was applied to measure the FHM due to slider-lubricant impact during read. The obtained FHM is a half-sinusoidal-like pulse with about 40 nm amplitude and 4 /spl mu/s width that is very similar to results measured on spin-stand tests by using a laser Doppler vibrometer (LDV).
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2003.816423