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D2D2 is a professional digital video format, created as a lower-cost alternative to D1. The format still used no digital compression, but saved bandwidth and other costs by sampling a fully encoded NTSC or PAL composite video signal and storing that directly on to tape, rather than sampling component video. This is known as digital composite. D2 used 19mm (3/4") tape loaded into cassettes. PCM-encoded audio and timecode are also recorded on the tape. The tapes are similar to the more popular D1 format, though they are not interchangeable. D2 has always had a mild stigma associated with it, and as of 2003 only a handful of broadcasters use it, and even then only to access materials recorded when the format was more popular. D3 is the equivalent Panasonic format.
D2 was also a computer from Datasaab. The civilian version was called D2 while the military was called SANK. In it's time the D2 was the fastest computer in Europe. It was later devloped into the D21. The D2 was a compact machine, the weight was only 150 kg.
D2 can also be an abbreviation for the computer game Diablo II (or it's expansion, Diablo II Lord of Destruction, D2 is commonly still used to describe it, although LoD may also be used to describe the expansion only) made by Blizzard Entertainment.
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