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OCFORMAT - Command for Formatting Both Sides of a Dual-Sided Optical Disk

IP.com Disclosure Number: IPCOM000105486D
Original Publication Date: 1993-Aug-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 70K

Publishing Venue

IBM

Related People

Power, RR: AUTHOR [+2]

Abstract

Sometimes, one volume (side) of a dual-sided optical disk has its volume label damaged and, thus, unreadable by an optical disk drive. During an audit restore of the optical library, this unreadable label can cause the logical loss of that volume.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

OCFORMAT - Command for Formatting Both Sides of a Dual-Sided Optical Disk

      Sometimes, one volume (side) of a dual-sided optical disk has
its volume label damaged and, thus, unreadable by an optical disk
drive.  During an audit restore of the optical library, this
unreadable label can cause the logical loss of that volume.

     At other times, it is highly desirable to audit only one side of
each cartridge in an optical library to know all of the cartridge
locations in that library.  Having to read the volume labels on both
sides of optical disks during an audit almost doubles the duration of
auditing all volumes in an optical library.

     Similarly, it is time consuming to read the volume labels of
both sides of a labeled cartridge when manually entering several
cartridges through the I/O port of the library.

     If the volume labels on opposing sides of an optical cartridge
were related, this would facilitate the solution of these problems.

     We propose an Optical Cartridge FORMAT command, OCFORMAT.  With
one call OCFORMAT would format both sides of an optical cartridge in
a single-sided optical drive.

     With OCFORMAT, the names of the volumes (sides) of the newly
formatted cartridge would be the same, except for a suffix which is
either A or B.  Appended to the volume names as a prefix would be the
characters "OC."  Thus, once an optical drive read OC_VOL510A on one
side of the optical disk, the OLMSCB (Optical Library Manager System
Control Block) would know that OC_VOL510B was the volume on the
obverse (opposite) side of that disk.

     Another attribute of OCFORMAT would be a redundant labeling
scheme.  Two sectors would be used to label each side of the
cartridge.  One of these two sectors would read:  "This side is
OC_VOL510A."  The adjacent sector would read:  "The other side is
OC_VOL510B."  This redundancy would help in recovering from missing
volume labels.  If one volume lost part or all of its label...