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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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