A fast, accurate, and reproducible in-drive measurement of media thermal decay

A rapid, in-drive technique for the measurement of the thermal decay rate of the magnetic readback signal amplitude has been developed. The adaptive variable-gain-amplifier (VGA) of the read channel is used to measure the signal amplitude eliminating the need for a high-speed digital oscilloscope. I...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2004-01, Vol.40 (1), p.231-234
Main Authors: Higgins, B.E., Schardt, B.C.
Format: Article
Language:English
Subjects:
Applied sciences
Electronics
Exact sciences and technology
Gain
Magnetic and optical mass memories
Magnetic devices
Magnetic noise
Magnetic separation
Magnetism
Noise level
Noise measurement
Noise reduction
Oscilloscopes
Other magnetic recording and storage devices (including tapes, disks, and drums)
Signal processing
Storage and reproduction of information
Thermal variables measurement
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Summary:A rapid, in-drive technique for the measurement of the thermal decay rate of the magnetic readback signal amplitude has been developed. The adaptive variable-gain-amplifier (VGA) of the read channel is used to measure the signal amplitude eliminating the need for a high-speed digital oscilloscope. Individual VGA measurements include a noise component significantly larger than the amplitude change due to thermal decay. It was found that by using interleaved sectors of aged reference data, the noise could be dramatically reduced. This report will detail techniques to reduce the noise level of the measurement and techniques to acquire the final thermal decay rate as rapidly as feasible.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2003.821190