For more than a decade, the cassette's chief competition in the portable tape market was the 8-track cartridge, invented in 1964. Eight-tracks were divided into four programs, each with two-track stereo (hence 8 tracks). Automobile manufacturers adopted the 8-track quickly, but the format had its flaws -- it wasn't rewindable and the programs sometimes split songs in two. By the late '70s, the cassette had won the tape war.
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