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Browse Prior Art Database

Automatic Positioning of an Optical Volume to Proper Side

IP.com Disclosure Number: IPCOM000037286D
Original Publication Date: 1989-Dec-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Freeman, HL: AUTHOR [+2]

Abstract

Described is a technique that mounts an optical volume into a mass optical storage device (MOSD) such that a side to be accessed is always loaded properly under a read/write mechanism. Time needed to flip the volume if the wrong side was mounted is eliminated. Information already known to the system and an operational convention to eliminate the extra flip are utilized. This is in marked contrast to a typical entry process which directly mounts the media to an optical disk drive: The volume label on the first side of the media is read, and system tables are updated to indicate the volume is no longer off-line but within the MOSD. The media is then flipped over using MOSD robotics, and an opposing side of the media is read. Again the system tables are updated to indicate this volume is within the MOSD.

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Automatic Positioning of an Optical Volume to Proper Side

Described is a technique that mounts an optical volume into a mass optical storage device (MOSD) such that a side to be accessed is always loaded properly under a read/write mechanism. Time needed to flip the volume if the wrong side was mounted is eliminated. Information already known to the system and an operational convention to eliminate the extra flip are utilized. This is in marked contrast to a typical entry process which directly mounts the media to an optical disk drive: The volume label on the first side of the media is read, and system tables are updated to indicate the volume is no longer off-line but within the MOSD. The media is then flipped over using MOSD robotics, and an opposing side of the media is read. Again the system tables are updated to indicate this volume is within the MOSD.

An optical volume is one side of an optical disk. Each disk contains two volumes, an A-side volume and a B-side volume. The side designation is made when a volume is first entered into a MOSD. This side designation is unchanged while the volume is recognized by the optical storage support. An operational convention is to place a label of an optical disk to the right when inserting the disk into the MOSD entry station. The A-side is always assigned to the volume on the same side as the label, the B-side is assigned to the other side.

When a request is made for a volume that is not in the MOSD, but is found in ...