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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 recorder drives manufactured since January 2000 are required by the DVD consortium to respect DVD region codes when reading a disc. The drives are incapable of assigning region codes when writing a disc as this is stored on a part of the disc to which PC based and standalone video recorders do not have write access.
Usable with some high-end security digital video recorders, such as the Tecton Darlex, as a secure and long-lasting export medium. Holds more data when using Double Sided discs than dual-layer DVD+RW and DVD-RW - 9.4GB for DVD-RAM vs 8.5GB for DVD+RW DL and DVD-RW DL.
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.
SCSI Multimedia Commands (MMC) is a standard defining a SCSI/ATAPI based command set for accessing and controlling optical disc readers/writers (any device of type 05h). ). Thus, optical drives for the compact disc, DVD, and Blu-ray disc fall under this specific
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.
Multi-format drives can read and write more than one format; e.g. DVD±R(W) (DVD plus-dash recordable and rewritable) is used to refer to drives that can write/rewrite both plus and dash formats, but not necessarily DVD-RAM. Drives marked "DVD Multi Recorder" support DVD±R(W) and DVD-RAM. [26]
Hard-disk-drive-based players: Devices that read digital audio files from a hard disk drive. These players have higher capacities as of 2010 [update] ranging up to 500 GB. [ 13 ] At typical encoding rates, this means that tens of thousands of songs can be stored on one player.