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Automatic Head Skew Adjust for Disk Testing

IP.com Disclosure Number: IPCOM000119704D
Original Publication Date: 1991-Feb-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Smith, GJ: AUTHOR [+2]

Abstract

In order to properly glide test magnetic recording disks, the glide qualification height should have the same radial profile as the product data head flying height. The method described allows the flying height of a glide head to be changed by automatically adjusting the head skew during a glide test having a constant rotational speed.

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Automatic Head Skew Adjust for Disk Testing

      In order to properly glide test magnetic recording disks,
the glide qualification height should have the same radial profile as
the product data head flying height.  The method described allows the
flying height of a glide head to be changed by automatically
adjusting the head skew during a glide test having a constant
rotational speed.

      In Fig. 1 the components of a skew adjustment method are shown.
The radial position of a head determines the correct skew setting for
the glide head so that the correct glide qualification height can be
achieved.  A microprocessor is used to control the head skew based on
the radius.  In Fig. 2, a comparison of the glide qualification
height for a conventional glide test and one including adjustable
skew is shown.  The use of this invention will minimize the amount of
under and over-qualification during a glide test without sacrificing
the test throughput.