Head to media interface monitoring
AssigneeSeagate Technology LLC
InventorsAntanas Daugela, Jon D. Trantham, Scott E. Ryun
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Abstract
A storage device disclosed herein includes a transducer head with a proximity sensor that generates head-disc proximity signals, a digitizer configured to convert the analog proximity signals from the proximity sensor to digitized sample data, a discrete wavelet transformation (DWT) module configured to analyze the digitized sample data by performing an enhanced DWT on the digitized sample data to generate DWT coefficients, and a modal filter configured to determine dominant head-disc interference (HDI) modes for a transducer head by analyzing the DWT coefficients.
Claims20
1) A method comprising:
- determining dominant head-disc interference (HDI) modes for a transducer head by analyzing samples of a monitored signal collected from a head-to-media proximity sensor.
9) A storage device comprising:
- a transducer head;
- a disc;
- a processor configured to determine dominant head-disc interference (HDI) modes for a transducer head by analyzing samples of a monitored signal collected from a head-to-media proximity sensor.
18) A storage device comprising:
- a disc;
- a transducer head;
- a thermal expansion device disposed proximate the transducer head;
- a proximity sensor configured to output analog data signals;
- a digitizer configured to convert the analog data signals from the proximity sensor to digitized sample data;
- a discrete wavelet transformation (DWT) module configured to analyze the digitized sample data by performing an enhanced DWT on the digitized sample data to generate DWT coefficients;
- and
- a modal filter configured to determine dominant head-disc interference (HDI) modes for a transducer head by analyzing the DWT coefficients.
Dependencies are inferred from the claim text.