Browse Prior Art Database

Fast Format via Swap with a Pre-formatted Scratch Cartridge

IP.com Disclosure Number: IPCOM000110921D
Original Publication Date: 1994-Jan-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Winarski, DJ: AUTHOR

Abstract

Erasable optical media can be MO (Magneto-Optic) or phase-change. When such erasable media is formatted, every sector on that volume is erased. Then, the directory area is written with all zeroes before the user is told that the format operation is complete. Since this is an extremely resource-consuming process, both in terms of the duration in time and usage of optical devices, it is desired that this not be serial with the workload of the user.

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Fast Format via Swap with a Pre-formatted Scratch Cartridge

      Erasable optical media can be MO (Magneto-Optic) or
phase-change.  When such erasable media is formatted, every sector on
that volume is erased.  Then, the directory area is written with all
zeroes before the user is told that the format operation is complete.
Since this is an extremely resource-consuming process, both in terms
of the duration in time and usage of optical devices, it is desired
that this not be serial with the workload of the user.

      The proposed solution is to allow the customer to have a few
pre-formatted scratch cartridges in each optical library.  When the
user desired to format a volume (side) or an entire cartridge of
erasable optical media, the control unit of the optical library would
enter the flowchart shown in the Figure.

o   If a scratch cartridge is available in step 11, the labels of the
    cartridge volume(s) 20 to be formatted are changed to "scratch
    cartridge" pseudo-names in step 12.  The OLMSCB (Optical Library
    Manager System Control Block) would immediately be updated.

o   In step 13, a pre-formatted cartridge 30 from the pool of scratch
    cartridges is seized and assigned the name chosen by the user for
    the newly formatted cartridge volume(s).

    The OLMSCB is updated accordingly.

o   After about 20 seconds, the user would see his/her format
    operation logged as complete.  This swapping of a pre-formatted
    cartridge would be approximately a factor of 60 times faster than
    currently required.

o ...