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DV on magnetic tape uses helical scan, which wraps the tape around a tilted, rotating head drum with video heads mounted to it. As the drum rotates, the heads read the tape diagonally. DV, DVCAM and DVCPRO use a 21.7 mm diameter head drum at 9000 rpm. The diagonal video tracks read by the heads are 10 microns wide in DV tapes. [15] [24]
Digital8 machines run tape at 29 mm per second, faster than baseline DV (19 mm/s) and comparable to professional DV formats like DVCAM (28 mm/s) and DVCPRO (34 mm/s). A 120-minute 8-mm cassette holds 106 m of tape and can store 60 minutes of digital video. A standard DVCPRO cassette holds 137 m of tape, good for 66 minutes of video.
A 14-inch reel of 2-inch quad videotape compared with a modern-day MiniDV videocassette. Both media store one hour of color video. The first commercial professional broadcast quality videotape machines capable of replacing kinescopes were the two-inch quadruplex videotape (Quad) machines introduced by Ampex on April 14, 1956, at the National Association of Broadcasters convention in Chicago.
Rear side of MicroMV cassette. MicroMV is a proprietary videotape format introduced in October 2001 by Sony.It is the smallest videotape format — 70% smaller than MiniDV or about the size of two US quarter coins; it is also smaller than a Digital8 or DV cassette and slightly smaller than an audio microcassette.
MiniDVD or 8 cm DVD (also "3 inch DVD") is a DVD disc with a reduced diameter of 8 centimetres (3.15 in). It has been most commonly used in camcorders due to its compact size. [1]
On sites like eBay and LoveAntiques, collectible VHS tapes are valued at upwards of nearly $10,000 - depending on the rarity and condition of the tape, of course.
The 8mm tape width was chosen as smaller successor to the 12mm Betamax format, using similar technology (including U-shaped tape loading) [16] but in a smaller configuration in response to the small configuration VHS-C compact camcorders introduced by the competition. It was followed by Hi8, a version with improved resolution.
A large DV cassette loaded with longer tape can deliver up to 4.5 hours of recording time. Tape manufacturers also offer MiniDV cassettes specifically for HDV recording. Such cassettes have the same Metal Evaporate (ME) formulation as normal DV cassettes, but are claimed to have reduced drop-out rate compared to standard DV cassettes.
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