Browse Prior Art Database

Fast Erase for Direct Access Storage Devices

IP.com Disclosure Number: IPCOM000111163D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Cunningham, EA: AUTHOR

Abstract

A method of rapidly erasing a Direct Access Storage Device (DASD) rigid disk drive for security purposes is disclosed. The method uses permanent magnets penetrating the disk pack, which rapidly erases all data and servo information, and renders the DASD inoperable.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 54% of the total text.

Fast Erase for Direct Access Storage Devices

      A method of rapidly erasing a Direct Access Storage Device
(DASD) rigid disk drive for security purposes is disclosed.  The
method uses permanent magnets penetrating the disk pack, which
rapidly erases all data and servo information, and renders the DASD
inoperable.

      The fast erasing DASD can be modified from a normal DASD rigid
disk drive by providing a thin plastic break-away window in the cover
of the disk enclosure at the edge of the disk pack.  This allows
normal operation of the DASD without contamination from external
airborne particles.  If it is determined that all information from
the DASD must be rapidly eliminated due to a security situation, then
an external device can break the window and drive small high energy
magnets between each pair of disks and on the top and bottom surfaces
of the disk pack, while the pack is spinning.  The permanent magnets
can be coated with a low friction material to allow the disk pack to
spin multiple times with the magnets inserted, thus providing
complete erasure of all the surfaces of the disks.

      The device which inserts the magnets, can be in the form of a
simple actuator, similar to that which moves the heads on arms inside
the DASD.  In this case, the drive only needs to be a spring that is
released by a small trigger solenoid.  The magnets are attached to
the arms instead of heads.  The magnets may be long thin rectangular
in form so they can p...