Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Multimedia Byte for Partial Mirroring

IP.com Disclosure Number: IPCOM000117978D
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 4 page(s) / 102K

Publishing Venue

IBM

Related People

Winarski, DJ: AUTHOR [+2]

Abstract

Backing up files can be very expensive, both in media and in time. Many Personal Computer (PC) applications now come on Compact Disk-Read Only Memory (CD-ROM) media. These applications, which take 112 MegaBytes (MB) of hard disk space and more, can unnecessarily take up an equal amount of MB of backup media space. There is no need to back up such large application files, when they already come on CD-ROM.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 51% of the total text.

Multimedia Byte for Partial Mirroring

      Backing up files can be very expensive, both in media and in
time.  Many Personal Computer (PC) applications now come on Compact
Disk-Read Only Memory (CD-ROM) media.  These applications, which take
112 MegaBytes (MB) of hard disk space and more, can unnecessarily
take up an equal amount of MB of backup media space.  There is no
need to back  up such large application files, when they already come
on CD-ROM.

      A multi-media byte in the header information of files is
proposed.  Examples of multi-media bytes are shown in Table 1.  This
multi-media byte depicts the source of the application or file.  As
shown in the Table, there is a vast plurality of storage media which
should be tracked for users.
  Table  Multimedia Byte
  Byte Value            Source Media
  B                     Bernoulli disk
  F                     Floppy disk
  C                     CD-ROM (Compact Disk, Read Only Memory)
  E                     CD-Erasable
  H                     HDCD (Hi-Density Compact Disk)
  M                     Magneto-optical disk
  R                     CD-Recordable
  V                     DVD (Digital Video Disk)
  W                     Write-once optical disk
  2                     1/2 inch tape
  4                     4 mm tape
  8                     8 mm tape
  D                     Digital linear tape
  O                     Optical tape
  P                     Pereos tape
  Q                     QIC tape
  T                     Travan tape
  Z                     Removable DASD
  L                     Downloaded from LAN
  S                     System file
  A                     Application-output

      Once this multimedia byte has been established, it can be
put to use for partial mirroring.  Mirroring refers to the copying of
files from one hard disk to another hard disk of identical geometry
(same number of sectors per track and same number of tracks per
cylinder).  Partial mirroring refers to the copying to another piece
of media only those files which cannot be retrieved from another
source.

      Thus, in the Table, partial mirroring would only copy files to
an alternate hard disk when those files had an A multimedia-byte.
Thus, only files created by an application (Application output) would
be mirrored.  This would include files such as AUTOEXEC.BAT and
CONFIG.SYS files.

      The user could expand upon those files partially mirrored.  For
example, the user could include files with a multimedia byte...