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| Glossary |
Description |
DVD |
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DVD stands for Digital Versatile
Disc. It's bigger and faster than CD and can hold
cinema-like video, better-than-CD audio, and computer
data. DVD invaded home entertainment, computers,
and business information with a single digital
format sometimes replacing audio CD, videotape,
laserdisc, CD-ROM, and video game cartridges.
The best known form of DVD is DVD-Video. It
is usually called simply DVD and is the one
we play movies from in our standalone DVD players.
DVD-Video and DVD-Audio are application formats
to support video and audio. DVD-ROM, DVD-R,
DVD-RW, DVD+RW, DVD-RAM are physical formats
and aren't compatible with each other. The usual
file system for DVD-ROM is UDF (different from
ISO-9660).
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DVD Disc Format |
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| Format |
Standalone
DVD
playback |
DVD-ROM
drive
PC playback |
| DVD-ROM (Read Only
Memory ) |
Yes |
Yes |
| DVD-RAM (Random Access
Memory ) |
No |
No |
| DVD-R (Recordable) |
(Yes) |
(Yes) |
| DVD+R (Recordable) |
(Yes) |
(Yes) |
| DVD-RW (Rewritable) |
(Most) |
(Most) |
| DVD+RW (Rewritable) |
(Yes) |
(Yes) |
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DVD Size |
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| Type |
Layer
|
Side |
Movie |
Data |
| DVD-5 |
single |
single |
2:15 hours |
4.7GB |
| DVD-9 |
dual |
single |
4 hours |
8.5GB |
| DVD-10 |
single |
dual |
4:30 hours |
9.5GB |
| DVD-18 |
dual |
dual |
8 hours |
17GB |
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Regional code |
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Regional code is a mechanism whereby
movie studios can control the release of home
video titles in different parts of the world.
Each player is given a code for the region in
which it's sold. A player coded for one region
will not play discs that are not allowed in that
region. There are 6 regions with codes:
| Region
code |
Zone |
1 |
Canada, U.S. and
the U.S. Territories |
2 |
Japan, Europe, South
Africa and the Middle East |
3 |
Southeast Asia, East
Asia (including Hong Kong) |
4 |
Australia, New Zealand,
Pacific Islands, Central America, Mexico,
South America and the Caribbean |
5 |
former Soviet Union,
Indian subcontinent, Africa, North Korea
and Mongolia |
6 |
China |
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CSS |
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CSS (Contents Scramble System)
encryption prevents digital copying of files directly
from disc. DVD-Video players and DVD-ROM drives
have a decryption capability that decodes the
data before display. |
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