Lenovo ThinkPad 770E-ED DVD Information Brief - Page 1

Lenovo ThinkPad 770E-ED Manual

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DVD: think of it as CD-ROM-but bigger, faster, and even more versatile DVD Optical Storage Information Brief Worth remembering DVD can store up to 17GB1 of data in a robust optical format The first DVD drives were read-only devices, or DVD-ROM The DVD format should spark innovative multimedia applications for business featuring full-screen, full-motion MPEG-2 digital video and Dolby Digital™ surround sound Planned DVD enhancements include write-once (DVD-R) and rewritable versions (DVD-RAM) available in 1997 or 1998 Overview There's no doubt about it-DVD is poised to revolutionize both the home electronics and computer industries. DVD has the look and feel of today's familiar audio CDs and CD-ROM discs (4.75-inch/120mm) that store music and computer software. For the computer industry, DVD delivers up to 17GB of storage, 25 times the current data capacity of CD-ROM. (A 3" variant of the format has also been proposed with 2.6GB of storage per side.) DVD drives are backwardcompatible with audio CD, CD-ROM, CD-i and PhotoCD. DVD-R (write once recordable) technology should be introduced by late-summer 1997, followed by DVD-RAM (write many) in 1998. For digital video storage, DVD uses the MPEG-2 compression scheme to accommodate the huge storage demands of high-quality feature length movies. Inside DVD technology Originally named "Digital Video Disk," then "Digital Versatile Disk," the format is now simply and officially "DVD" with no three-word-equivalent. DVD has become an industry standard thanks to the efforts of Sony, Toshiba, Phillips, IBM and other companies. IBM chaired the computer industry technical working group that was responsible for defining the requirements of DVD for the computer industry. IBM helped bridge the gap between two opposing factions who had proposed incompatible formats. The brokered agreement sets forth a universal standard, avoiding a replay of the VCR marketing war between proponents of the VHS and Beta formats. Like CD-ROM, the DVD format is read by an infrared laser focused through a protective plastic layer onto the disc's reflective layer. (The transparent layer is 1.2mm thick on a CD-ROM, but only .6mm on a DVD-ROM.) The beam reflects off pits burned into the reflective layer by the recording laser and is passed through optics to the pickup. The laser beam utilized on a CD-ROM player has a wavelength of 780 nanometers (.78 millionth of a meter). DVD players employ a September 1997

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DVD: think of it as CD-ROM
—
but bigger, faster, and even more versatile
DVD Optical Storage
Information Brief
Worth remembering
DVD can store up to 17GB
1
of data in a robust optical format
The first DVD drives were read-only devices, or DVD-ROM
The DVD format should spark innovative multimedia applications for business featuring
full-screen, full-motion MPEG-2 digital video and Dolby Digital™ surround sound
Planned DVD enhancements include write-once (DVD-R) and rewritable versions
(DVD-RAM) available in 1997 or 1998
Overview
There’s no doubt about it—DVD is poised to revolutionize both the home electronics and com-
puter industries. DVD has the look and feel of today’s familiar audio CDs and CD-ROM discs
(4.75-inch/120mm) that store music and computer software. For the computer industry, DVD de-
livers up to 17GB of storage, 25 times the current data capacity of CD-ROM. (A 3" variant of the
format has also been proposed with 2.6GB of storage per side.) DVD drives are backward-
compatible with audio CD, CD-ROM, CD-i and PhotoCD. DVD-R (write once recordable) tech-
nology should be introduced by late-summer 1997, followed by DVD-RAM (write many) in 1998.
For digital video storage, DVD uses the MPEG-2 compression scheme to accommodate the huge
storage demands of high-quality feature length movies.
Inside DVD technology
Originally named “Digital Video Disk,” then “Digital Versatile Disk,” the format is now simply
and officially “DVD” with no three-word-equivalent. DVD has become an industry standard
thanks to the efforts of Sony, Toshiba, Phillips, IBM and other companies. IBM chaired the com-
puter industry technical working group that was responsible for defining the requirements of
DVD for the computer industry. IBM helped bridge the gap between two opposing factions who
had proposed incompatible formats. The brokered agreement sets forth a universal standard,
avoiding a replay of the VCR marketing war between proponents of the VHS and Beta formats.
Like CD-ROM, the DVD format is read by an infrared laser focused through a protective plastic
layer onto the disc’s reflective layer. (The transparent layer is 1.2mm thick on a CD-ROM, but
only .6mm on a DVD-ROM.)
The beam reflects off pits burned into the reflective layer by the
recording laser and is passed through optics to the pickup. The laser beam utilized on a CD-ROM
player has a wavelength of 780 nanometers (.78 millionth of a meter). DVD players employ a
September 1997