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![Betamax and Betacam tapes](http://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Betacam_betamax_tapes.jpg/350px-Betacam_betamax_tapes.jpg)
Sony's Betamax is a 1/2 inch (12.7 millimeter) home videocassette tape recording format introduced on April 16, 1975 (in market on May 10) and derived from the earlier, professional 3/4 inch (19.05 millimeter) U-matic video cassette format.