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Disk Pattern to Boost the Fly Height of an Air Bearing Slider

IP.com Disclosure Number: IPCOM000113340D
Original Publication Date: 1994-Aug-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Hendriks, F: AUTHOR

Abstract

Railed taper/flat slider over a bucket-chain pattern etched into the disk surface.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 70% of the total text.

Disk Pattern to Boost the Fly Height of an Air Bearing Slider

      Railed taper/flat slider over a bucket-chain pattern etched
into the disk surface.

      The present idea relates to magnetic recording technology on
hard disks.  The inexorable consequence of lowering the recording gap
(often referred to as fly height by air bearing designers) has been
that there is occasional "contact" between slider and disk which by
means of wear and creation of wear particles can shorten the
operational life of the head/disk interface.  Given that the actual
read and write time (that is the utilization) is at best only a few
percent, it is natural to seek methods to increase the head gap when
it need not be small.  There are for example various methods in which
the slider changes shape (active sliders) with a corresponding change
of fly height.  Given the difficulty of fabricating the present
(passive) sliders with acceptable fabrication yield, one searches for
other methods that affect the fly height.  One group of such methods
involve patterning the disk which in turn changes the bearing gap.
In the present case, we choose patterns that are aimed at achieving a
maximum increase of fly height for a given slider load.  One such
pattern is essentially a sequence of shrouded Raleigh bearings, which
are known for their maximal lift properties.  The main reason is the
prevention of side leakage by the shrouds.  Thus, it is proposed to
etch a pattern in the disk in the shap...