Digital Versatile Disk (formerly: Digital Video Disk). A data or video media, allowing storage of data or playback of video and audio from a digitally recorded disk which resembles a CD. The video disk allows playback of a full feature movie of more than 2 hours. MPEG compression is used for recording. The audio section is digitally recorded as well, with various surround sound schemes, such as Dolby AC3. The world was divided into several “zones” incompatible with each other. Several different standards exist, similar to PAL and NTSC and some manufacturers have released Multi-standard / Multi-zone players. Copy protection schemes are built into the DVD player in order to avoid piracy. The single layer DVD capacity is about 4.7 gigabytes and the double layer capacity is 8.5 gigabytes. DVD players are available for the PC as well, which also allow playback of regular data CD-ROMs as well as music CDs. Recordable DVD (named DVD RAM or DVD R) has recently been introduced. There are currently 5 leading standards for recordable DVDs. The old one which was recently upgraded, is the DVD RAM, and then there are DVD+R, DVD+RW (Rewritable) DVD-R and DVD-RW (Rewritable). It will take several years until one standard prevails, if at all. In a DVD, as the signals are recorded digitally, quality is expected to be very high, and fast, random access to any part of a movie will allow fast and easy editing. There are already stand-alone DVD recorders in the market with analog or digital inputs, allowing the recording of up to 2 hours of high quality video or TV programs, or several hours of lower video quality. The recordable DVD probably marks the end of the classic VCR.
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