Browse Prior Art Database

Handling Single Volume Optical Platters

IP.com Disclosure Number: IPCOM000122086D
Original Publication Date: 1991-Oct-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 40K

Publishing Venue

IBM

Related People

Mustain, RG: AUTHOR

Abstract

Newer optical disk drive technology has led to optical drives with dual read/write heads. All previous drives used single read/write head technology which led to the development of optical media handlers that expect two separate volumes on a single piece of media. The ability to handle a single volume per piece of media while still supporting dual volumes per media is disclosed.

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This is the abbreviated version, containing approximately 95% of the total text.

Handling Single Volume Optical Platters

      Newer optical disk drive technology has led to optical drives
with dual read/write heads.  All previous drives used single
read/write head technology which led to the development of optical
media handlers that expect two separate volumes on a single piece of
media.  The ability to handle a single volume per piece of media
while still supporting dual volumes per media is disclosed.

      The handling of a single volume/media in a system that still
supports dual volumes/media is accomplished by maintaining a second
volume name for the media in all system tables and by marking that
volume as a 'pseudo-volume'. This pseudo-volume indicator is then
checked by the volume manager and never presented to the user.
Since, a volume name is never presented to the user, there is no way
to initialize the pseudo-volume, or execute any other volume
commands.  Since the pseudo-volume can never be initialized, it will
always retain a system generated volume name.  The rest of the
optical storage support treats volumes with system-generated names as
empty volumes and never looks at them.

      This simple method of handing a single volume is accomplished
with a minimum of effort.  The system must recognize the drive
attributes and set the pseudo-volume indicator for any media placed
into this type of drive.  The volume manager checks the indicator and
disables the display of the pseudo-volume.  All other components
handle the...