Patent ID: 8958170
Filing Date: 2015-02-17
Classification: G11B

Abstract:
1. A method comprising: receiving, from a tape drive, a Position Error Signal (PES) data set, that describes a positional variance of a head tape interface in relation to a tape and that has a number of samples; determining a frequency of interest based on a size of one or more rollers in the tape drive and a velocity of the tape; determining a number of Discrete Fourier Transform (DFT) iterations based upon the frequency of interest and the number of samples; performing, based upon the determined number of DFT iterations, a plurality of DFT iterations on the PES data set including the frequency of interest, each DFT iteration performed on a different number of samples from the PES data set; and identifying a plurality of amplitudes from the plurality of DFT iterations that corresponds to disturbance from one of the rollers in the tape drive.