(last updated: September 6, 2000)
Primer is designed as an introduction to DVD. We believe that it answers
most basic questions, but if you have suggestions for information to add
to the Primer, please contact us at the Secretary Office (Tel: +81-3-5777-2881
DVD'S IMPORTANCE TO VARIOUS INDUSTRIES
ABOUT DVD FORUM
What does DVD mean?
keyword is "versatile." Digital Versatile discs provide superb
video, audio and data storage and access -- all on one disc.
the basic difference between DVD and CD?
is a high capacity multimedia data storage medium. It can accommodate
a complete movie on a single disc, content rich multimedia or
very high quality multi-channel audio.
I play CDs on my DVD player?
DVD hardware will play audio CDs and CD-ROMs. The physical dimensions
are identical to compact discs. But you should check with your
DVD brand's dealer to confirm compatibility with CDs.
the market outlook for DVD?
market for DVD has grown faster than CD or VHS did in their
first two years in the USA, Europe and Asia.
recent market research study predicts that DVD will become the
standard home video format, replacing video cassettes within
the next five years.
of DVD hardware will reach 46 million units in 2000, including
21 million in the United States and 17 million in Europe, according
to the report. (The different formats included in this forecast.)
research also predicts that worldwide shipments of set top DVD
players will increase by 300 per cent in 2000 and retail revenues
across the United States, Europe and Japan will rise by 220
percent to $7 billion.
does DVD technology differ from CD?
CDs, DVDs store data in microscopic grooves running in a spiral
around the disc. All DVD drive types use laser beams to scan
these grooves: Minuscule reflective bumps (called lands) and
nonreflective holes (called pits) aligned along the grooves
represent the zeros and ones of digital information.
that's where the similarities end. DVDs use smaller tracks (0.74
microns wide, compared to 1.6 microns on CDs) as well as new
modulation and error correction methods. These technologies
allow them to store data seven times as large as that of a CD.
The narrow tracks require special lasers--which can't read CD-ROMs,
CD-Rs, CD-RWs, or audio CDs. DVD drive makers managed to solve
do the various DVD formats differ?
viewing movies and other visual entertainment. The total capacity
is 17 Gbytes if two layers on both sides of the disk are
basic technology is the same as DVD Video, but it also includes
computer-friendly file formats. It is used to store data. This
product should supplant conventional CD-ROMs in the near future.
capacity is 4.7 Gbytes. Originally designed for professional
authoring, a version for general consumer use is now under development.
As with CD-R, users can write only once to this disk.
makes DVD a virtual hard disk, with a random read-write access.
Originally a 2.6-Gbyte drive, its capacity has increased
to 4.7-Gbyte-per-side. It can be re-written more than 100,000
to DVD-RAM except that its technology features a sequential
read-write access more like a phonograph than a hard disk. Its
read-write capacity is 4.7 Gbytes per side. It can be re-written
up to about 1,000 times.
latest audio format more than doubles the fidelity of a standard
CD. It is expected to become the most popular audio disk.
DVD Multi a new format?
Multi is not a new format, but a set of specifications that
will define which drives will read and write which disks for
the various DVD consumer and computer applications.
Multi is targeted at providing broader compatibility across
DVD disks, and will embrace all existing format versions.
the storage capacity of DVD?
DVD can store over two hours of video on one layer of the disc.
CD can store just 74 minutes of data -- just enough to hold
Beethoven's Ninth Symphony.
is DVD video superior to that of standard videotape?
video storage provides resolution which is far greater than
that offered by laser disc media and almost twice the resolution
of standard VHS videotape.
resolution is dependent on the capabilities of the television
monitor used, but you need not have a new monitor to enjoy the
benefits of DVD. DVD video also provides low noise.
more advantage is that a DVD disc is not physically touched
while it spins in the player, so there is no wear and tear or
loss of fidelity over time. In contrast, videotapes do touch
a playback mechanism and eventually break down, degrading the
quality of picture.
DVD'S IMPORTANCE TO VARIOUS INDUSTRIES
is DVD meeting the needs of various industries?
-- The movie industry needs a disc capable of holding a full
length movie of execellent quality video with surround sound
audio. DVD Video meets this need.
-- The computer industry needs higher capacity for the increasingly
complex multimedia applications which are now being developed.
DVD-ROM meets this need. The computer industry also needs new
recordable and re-writable versions of DVD for data storage
and archival. DVD-RAM and DVD-R meet this need.
-- The entertainment industry needs DVD for new video games
with better and more realistic video content. DVD-ROM meets
this need. The music industry wants a higher quality format
than CD, as well as increased playing time. DVD-Audio meets
ABOUT DVD FORUM
the purpose of the DVD Forum?
Forum is the core DVD industry organization for establishing
DVD format standards.
have eight Working Groups to assure the reliability of DVD hardware
and software products and 11 format "Class-A" Verification Laboratories
around the world which work closely together to maintain DVD
belongs to the DVD Forum?
every major company involved in DVD is a member of DVD Forum.
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November 14, 2004
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