DVD more Data storage than CDs

Digital Video Disc or Digital Versatile Disc
DVD a small plastic disc used for the storage of digital data. The successor media to the compact disc (CD), a DVD can have as much as 26 times the storage capacity of a CD. When compared to CD technology, DVD also allows for better graphics and greater resolution. In the case of an audio recording, where the data to be stored is in analog rather than digital form, the sound signal is sampled at a rate of 48,000 or 96,000 times a second, then each sample is measured and digitally encoded on the 4 3/4 -in. (12-cm) disc as a series of microscopic pits on an otherwise polished surface. The disc is covered with a protective, transparent coating so that it can be read by a laser beam. As with other optical disks nothing touches the encoded portion, and the DVD is not worn out by the playing process. Because DVD players are backward compatible to existing technologies, they can play CD and CD-ROM discs; however, CD players cannot play DVD and DVD-ROM discs.

DVDs Read Only
A DVD-ROM is like a larger CD-ROM that holds data and interactive audio and video material. Like CD-ROMs, DVD-ROMs are manufactured.

DVD Audio
DVD-Audio is a format for delivering high-fidelity audio content on a DVD. It offers many channel configuration options at various sampling frequencies and sample rates. Compared with the CD format, the much higher capacity DVD format enables the inclusion of either considerably more music or far higher audio quality.

DVD TV Game
A DVD TV game is a standalone game that can be played on set-top DVD players. The game takes advantage of technology built into the DVD format to create an interactive gaming environment. To function correctly the DVD TV Games require no additional hardware and are compatible with most DVD players, including DVD-ROM. This technology has already been implemented for use in gaming, advertising, music, education, and corporate training.

DVD Stands For?
Originally, "Digital Video Disc" Since the technology became important to the computer world, the "video" was dropped, and it was just D-V-D. Later, it was dubbed "Digital Versatile Disc" by the DVD Forum. Take your pick.

Direct to DVD
The popularity of DVDs has caused the term "direct-to-DVD" to widely replace "Direct-to-video" (see main article). However, the lucrative market for DVDs has resulted in less stigma for direct-to-DVD releases as compared to direct-to-video releases. Some minor films can be made with a small budget and turn a profit on DVD sales alone, and some are made specifically for this purpose.

DVD recordable and rewriteable
Initially developed for the need of data storage for back-up and transport, DVD recordable is now also used for consumer audio and video recording. Three formats were developed: -R/RW (minus), +R/RW (plus), -RAM (ram).

Dual layer recording
DVD recordable discs supporting this technology are backward compatible with some existing DVD players and DVD-ROM drives. Many current DVD recorders support dual-layer technology, and the price point is comparable to that of single-layer drives, though the blank media remains significantly more expensive. Currently the technology has severe problems with compatibility in hardware DVD players.

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