In 1971, Sony developed the world's first videocassette format, but the device proved unsuccessful for home usage because it was too expensive. Name this early piece of technology.

U-matic is an analog recording videocassette format developed by Sony in October 1969 as a prototype, which became commercially available in 1971. It was one of the first video formats to include the videotape inside the cassette, as opposed to the other reel-to-reel formats available at that time.

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