Close loop method for measuring head SNR and media SNR
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United States of America Patent
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Jan 21, 2014
Grant Date -
Nov 15, 2012
app pub date -
May 12, 2011
filing date -
May 12, 2011
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Abstract
A close loop method for measuring head SNR, for a storage device comprising a storage media and a head, comprising steps of: (a) loading the head on the media with a dynamic fly height; (b) measuring an initial environmental temperature value T1 and measuring the head signal signalload; (c) unloading the head; (d) adjusting a power which controls the dynamic fly height until a real-time environmental temperature value T2 is equal to the initial environmental temperature T1; (e) measuring the head noise value noiseunload, (f) calculating the head SNR with the follow equation:
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