Browse Prior Art Database

Disk File Conditioning at Low Pressure to Remove Contaminants

IP.com Disclosure Number: IPCOM000118163D
Original Publication Date: 1996-Oct-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Crowder, N: AUTHOR [+2]

Abstract

Disclosed is a process for conditioning Direct Access Storage Device (DASD) disk files at low pressures to remove volatile contaminants which can reduce long term reliability.

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Disk File Conditioning at Low Pressure to Remove Contaminants

      Disclosed is a process for conditioning Direct Access Storage
Device (DASD) disk files at low pressures to remove volatile
contaminants which can reduce long term reliability.

      An intact disk file is placed in a chamber which can be
partially evacuated by pumping to reduce the ambient pressure.  The
reduced pressure in the file serves to increase the outgassing rate
of volatile materials which are then removed from the file
environment by the pumping process.  In order to further increase the
outgassing rate, the file is heated to a temperature above the design
point for file operation.  Heating the file is done by placing the
file in contact with a suitable heat source in the vacuum chamber.

      The processing time during which the file is held at reduced
pressure and elevated temperature depends on both the temperature
and pressure used and on the amount and volatility of the
contaminants.  Optimization of this process time for a particular
file design is achieved by instrumented testing to monitor pressure
inside the file during the pumping and heating process.