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Browse Prior Art Database

Frequency Independent Displacement Amplification

IP.com Disclosure Number: IPCOM000102841D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 31K

Publishing Venue

IBM

Related People

Bowen, AJ: AUTHOR

Abstract

This invention relates to any method of applying a reversing pulse to the spindle motor of a hard file prior to the normal forward pulses. This approach increases the effective starting torque available to release any stuck R/W heads that might exist in the file.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Frequency Independent Displacement Amplification

      This invention relates to any method of applying a reversing
pulse to the spindle motor of a hard file prior to the normal forward
pulses.  This approach increases the effective starting torque
available to release any stuck R/W heads that might exist in the
file.

      This invention works because the flexible suspensions that hold
the R/W heads to the disks have an elastic character in the disk's
rotational direction.  The suspension's elasticity will allow a
non-zero rotation of the disk (from its parked position) in both the
forward and the reverse directions.  By applying a reverse pulse to
the spindle motor prior to the forward rotational pulses, the
rotational angle can be double for stuck heads.  This doubled angle
permits more rotational energy to be stored in the disk pack during
startup.  This increased rotational energy is now available to
release heads that would normally be stuck.  The suspension can be
optimized for servo accessing response in the radial direction and
for stiction in the rotational direction.

      Disclosed anonymously.