Patent ID: 6757622
Filing Date: 2004-06-29
Classification: G11B

Abstract:
A method of estimating acoustic sound power produced by a disc drive using mechanical vibration data acquired while operating the disc drive, the method comprising steps of:selecting a subset of predictive frequencies from a set of disc drive frequencies consisting essentially of operational driving frequencies in the disc drive and system resonance frequencies in the disc drive; acquiring mechanical vibration data while operating each disc drive in a group of disc drives; determining predictive mechanical vibration magnitudes at each of the predictive frequencies for each disc drive in the group of disc drives; determining an operating acoustic sound power value for each disc drive in the group of disc drives; and correlating mechanical vibration magnitude at the predictive frequencies to sound power to determine the correlation constants using the determined mechanical vibration magnitudes and the determined operating acoustic sound power values; determining predictive vibration magnitudes at each of the frequencies in the subset of predictive frequencies from the mechanical vibration data; and determining an estimated acoustic sound power value for the disc drive from the correlation constants and the predictive vibration magnitudes, wherein the step of correlating vibration magnitude to sound power comprises steps of: calculating predictive root sum square values including a root sum square of the predictive vibration magnitudes for each disc drive; and correlating the predictive root sum square values to sound power.