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"VCR"-format cassettes in case (left) and on own (right). A full-size CD is shown for scale.

Size comparison between a Betamax cassette (top) and a VHS cassette (bottom)

The videotape format war was a period of competition or "format war" of incompatible models of consumer-level analog video videocassette and video cassette recorders (VCR) in the late 1970s and the 1980s, mainly involving the Betamax and Video Home System (VHS) formats. VHS ultimately emerged as the preeminent format.^[1]

^ "The Betamax vs VHS Format War, Author: Dave Owen, Originally published: 2005". Mediacollege.com. Retrieved 2012-09-16.