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Magnetic disk system

  • US 5,555,142 A
  • Filed: 03/25/1994
  • Issued: 09/10/1996
  • Est. Priority Date: 09/27/1990
  • Status: Expired due to Fees
First Claim
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1. A magnetic disk system comprising a magnetic head and a servo control circuit for positioning the magnetic head, in which said magnetic head comprises:

  • a magnetic film having two ends and a magnetic resistance effect and disposed parallel to a direction of a width of a track of a magnetic recording medium;

    a pair of current supplying electrodes in contact with both ends of said magnetic resistance film; and

    a signal detecting electrode in contact with said magnetic resistance film and disposed at such an position between said pair of current supplying electrodes that a first reproduced output between said signal detecting electrode and a first one of said pair of current supplying electrodes equals to a second reproduced output between said signal detecting electrode and a second one of said pair of current supplying electrodes when said magnetic film is centered over the track of the magnetic recording medium, andsaid servo control circuit comprises;

    means for calculating a difference between said first reproduced output and said second reproduced output to produce a position signal of the magnetic head relative to the track; and

    means for controlling a position of the magnetic head based on the position signal.

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