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DVD

From Wikipedia

DVD, also known as “Digital Versatile Disc” or “Digital Video Disc,” is an optical disc storage media format mainly used for video, audio, and data storage. DVD can store more than six times the amount of data as a CD; it holds about 4.7GB on a single layer and about 8.54GB on a dual layer.

Variations of the format:
DVD-R, DVD+R, DVD-R DL, DVD+R DL, DVD-RW, DVD+RW, DVD-RW DL, DVD+RW DL, DVD-RAM, DVD-D, HD DVD: HD DVD-R, HD DVD-RW, HD DVD-RAM, Blu-ray Disc® (BD): BD-R, BD-RE, UMD (for PSP - Playstation Portable®), and Laserdisc.

DVD-ROM is read-only. DVD-R and DVD+R can be written once. DVD-RAM, DVD-RW, or DVD+RW can be erased and re-written multiple times. DVD-Video and DVD-Audio discs have properly formatted and structured video and audio content (retail formats). Other types are referred to as DVD-Data discs.

DVD-Video:
Most consumer DVD-Video discs use MPEG-2 video stored at a resolution of 720_480 (NTSC) or 720_576 (PAL) at 29.97 or 25FPS. Audio is stored in the Dolby Digital® (AC-3) or DTS formats, ranging from 16-bits/48kHz to 24-bits/96kHz with mono to 7.1 channel presentation. DVD-Video also supports interactive menus, subtitles, multiple audio tracks, etc.

DVD-Audio:
This is a format for delivering high-fidelity audio content on a DVD from mono to 7.1 surround sound at various sampling rates (up to 24-bits/192kHz versus CD's 16-bits/44.1kHz). Compared with CD, the much higher capacity DVD format enables the inclusion of more data for higher audio quality. DVD-Audio competed with rival standard SACD, but neither gained enough popularity to survive.

This article is licensed under the GNU Free Documentation License found at http://www.gnu.org/copyleft/fdl.html. It uses material from the Wikipedia article at http://en.wikipedia.org/wiki/Dvd.