Browse Prior Art Database

Compact Disk Read Only Memory Device and Media Enhancement

IP.com Disclosure Number: IPCOM000112566D
Original Publication Date: 1994-May-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 72K

Publishing Venue

IBM

Related People

Thorpe, RA: AUTHOR

Abstract

Described is a hardware implementation to enhance the operation of compact disk Read Only Memory (CD-ROM) device and media so as to attain higher data transfer rates from the CD-ROM by paralleling read tracks.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 54% of the total text.

Compact Disk Read Only Memory Device and Media Enhancement

      Described is a hardware implementation to enhance the operation
of compact disk Read Only Memory (CD-ROM) device and media so as to
attain higher data transfer rates from the CD-ROM by paralleling read
tracks.

      In prior art, CD-ROM devices and media had typical capacities
of 600 Mega-bytes and data rates of 2.4 Mega-bits per second.  The
concept described herein provides a mechanism for increasing the data
rate at which bits can be read from a CD-ROM.

      Generally, CD-ROM data is recorded and read one bit at a time
sequentially from a continuous spiral track on the media.  This
single track is usually formatted in several different ways into
frames, or sectors, that represent logical blocks of data.  Embedded
into the frames, in addition to the data, are control fields that
provide synchronization, address and mode selection.  Optionally,
error correction coding is included for improving the reliability of
the data being read.  Due to the desire to remain compatible with
current audio playback systems, the development of the CD-ROM has
been constrained regarding the real time reading of bits and the
rotational speed of the device.

      The concept described herein provides a means of increasing the
data rate by a factor N by implementing a band of N tracks on the
media, where the band is laid down in a spiral format, similar to the
way a single track is positioned in the prior...