Browse Prior Art Database

Method and Apparatus for Reducing Response Time in Digital Versatile Disk Retrieval Systems

IP.com Disclosure Number: IPCOM000118803D
Original Publication Date: 1997-Jul-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Winarski, DJ: AUTHOR

Abstract

Many computer users have tables of data which are frequently referred to but not altered or altered infrequently. It is desired to reduce the time to read these frequently accessed files by storing multiple copies of these files on the same piece of Digital Versatile Disk (DVD) media.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 66% of the total text.

Method and Apparatus for Reducing Response Time in Digital Versatile
Disk Retrieval Systems

      Many computer users have tables of data which are frequently
referred to but not altered or altered infrequently.  It is desired
to reduce the time to read these frequently accessed files by storing
multiple copies of these files on the same piece of Digital Versatile
Disk (DVD) media.

      Access time is improved in a DVD disk by providing a
multiplicity of copies of the data on the DVD disk.  The copies and
the original are stored in different areas and sides of the disk.
Each copy is stored on a different layer from the original.  The
multiple copies are created, changed, and/or deleted independent of
any user control.  The usage of the original and any copies determine
the number  of copies and their residence on a DVD-RAM or DVD-R disk.
The device manager selects the file to be retrieved in the shortest
response time  using the location of the original and the copies, the
layer that the head is on, and the radial position of the head.  In
other words, the shortest path of a plurality of paths is taken to
the desired frequently  accessed file.

      In summary, this disclosure advocates storing the original and
multiple copies of files on DVD media.  The file management of the
copies is done at the PC level and is transparent to the user.  Any
changes to the current original are later made to all copies during
quiescent (quiet) time of the DVD drive...