Patent ID: 8792193
Filing Date: 2014-07-29
Classification: G11B

Abstract:
1. A magnetic media tester comprising: a Laser Doppler Vibrometer (LDV) head; a magnetic read head; the LDV head and the magnetic read head being configured for obtaining correlatable data of a region on a magnetic disk, wherein data obtained by the magnetic read head and data obtained by the LDV head are correlated by calibration of the magnetic read head and calibration of the LDV head with a calibration feature on the magnetic disk; and a data enhancement module for enhancing data obtained by the LDV head, wherein the data enhancement module is configured to eliminate variation in a background signal and enhance at least one detected signal riding on the background signal, and wherein the data enhancement module is configured to define a set of sequential data points obtained by the LDV head encompassing the at least one detected signal, compute a fitted line value for each data point in the set of sequential data points, and square a difference between each data point and its fitted line value.