DV is a format for storing digital video. It was launched in 1995 with joint efforts of leading producers of video camera recorders. DV was originally designed for recording onto magnetic tape. Tape is enclosed into videocassettes of four different sizes: small, medium, large and extra-large. All DV cassettes use tape that is 1/4 inch (6.35 mm) wide. Small cassettes, also known as S-size or MiniDV cassettes, had been intended for amateur use, but have become accepted in professional productions as well. MiniDV cassettes are used for recording baseline DV, DVCAM as well as HDV. Technically, any DV cassette can record any variant of DV video.