Patent ID: 6865052
Filing Date: 2005-03-08
Classification: G11B

Abstract:
1. A method to calibrate a servo sensor disposed on a tape head disposed adjacent a moving magnetic tape, wherein said magnetic tape includes at least one servo edge comprising an interface between a first recorded signal and a second recorded signal, wherein said servo sensor detects said first recorded signal and said second recorded signal, and wherein a servo detector provides a servo signal comprising the ratio of the detected first recorded frequency and the detected second recorded frequency, and wherein an independent position sensor provides an IPS signal comprising the lateral position of said tape head with respect to the tape path, said method comprising the steps of: sampling said servo signal and said IPS signal to form servo signal/IPS signal data as said tape moves adjacent said servo sensor; determining (N) measured datapoints using said servo signal/IPS signal data, wherein each of the DP calculating a transfer function using said (N) datapoints and an (n)th order curve fitting algorithm, wherein (n) is greater than or equal to 1 and less than or equal to about 6; forming a first calibration curve comprising (N) calculated datapoints DP setting a value for the maximum allowable residual error RE computing (N) residual error values, wherein the residual error RE adjusting said first calibration curve to form a second calibration curve based upon said (N) residual error values.