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Management of tape drive quality using discrete fourier transform analysis

  • US 8,958,170 B1
  • Filed: 02/17/2014
  • Issued: 02/17/2015
  • Est. Priority Date: 02/17/2014
  • Status: Expired due to Fees
First Claim
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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.

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