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Browse Prior Art Database

Sweep Implementation for Rotary Actuator

IP.com Disclosure Number: IPCOM000122845D
Original Publication Date: 1998-Jan-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Brown, B: AUTHOR [+3]

Abstract

Performing a continuous sweep of a recording head from the inner diameter of the magnetic disk can reduce the amount of loose particles on a recording disk of up to 90%.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 88% of the total text.

Sweep Implementation for Rotary Actuator

      Performing a continuous sweep of a recording head from the
inner diameter of the magnetic disk can reduce the amount of loose
particles on a recording disk of up to 90%.

      Since no file manufacturing environment or even file interior
is perfectly free of small particles it is important to deal with
that given fact properly.  Experiments show that a loose particle
likely becomes a thermal asperity once it is hit by the taper of a
recording head.  This causes the particle to become imbedded
permanently into the disk surface and subsequently can interfere with
the read/write process.

      The approach is to remove the particles as long as they are in
loose state on the disk surface.  Given through the geometrical
design of a file an arrangement is selected where the particle, which
travels on a circumferential track, first hits the side rail of the
slider instead of the taper.  The side rail moves the particle by a
small distance toward the outer rim to the disk.  During the next
revolution the slider also has advanced a well defined distance
toward the outer rim and thus pushes the particle even further to the
outer rim.  This process is continuous until the outer most position
of the slider is reached.

      If this so-called  sweep process' is performed in the right
manner about 90% of loose particles can be removed off the disk
surface.  A proper implementation of this sweep process takes about
...