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The DVD (common abbreviation for digital video disc or digital versatile disc) [9] [10] is a digital optical disc data storage format. It was invented and developed in 1995 and first released on November 1, 1996, in Japan .
DVD (initially an acronym of "Digital Video Disc", then backronymed as "Digital Versatile Disc" and officially just "DVD") was the mass market successor to CD. DVD was rolled out in 1996, again initially for video and audio. DVD recordable formats developed some time later: DVD-in late 1997 and DVD+ in 2002.
Originally to be known as "digital video disc", the name changed before release to be "digital versatile disc" to indicate that it was also useful for computer storage. [13] Over time, DVDs followed a similar pattern as CDs; Pioneer introduced a write-once format in 1997 that could be read in existing DVD drives, DVD-R. [14]
In the late 1980s and early 1990s, Optex, Inc. of Rockville, MD, built an erasable optical digital video disc system U.S. patent 5,113,387 using Electron Trapping Optical Media (ETOM) U.S. patent 5,128,849. Although this technology was written up in Video Pro Magazine's December 1994 issue promising "the death of the tape", it was never marketed.
Optical drives for computers come in two main form factors: half-height (also known as desktop drive) and slim type (used in laptop computers and compact desktop computers). They exist as both internal and external variants. Half-height optical drives are around 4 centimetres tall, while slim type optical drives are around 1 cm tall.
Digital video is an electronic representation of moving visual images in the form of encoded digital data. This is in contrast to analog video, which represents moving visual images in the form of analog signals. Digital video comprises a series of digital images displayed in rapid succession, usually at 24, 25, 30, or 60 frames per second ...