Unifile Twiggy floppy drive
Apple built the Unifile Twiggy floppy drive in 1983. It was a double-sided drive that had heads on opposite sides of the spindle as against each other as conventional drives did. It also used unconventional floppy media, named “FileWare”, with two cutouts instead of one. Fileware Twiggy Disks offered the capacity of over 800k and the Unifile was announced by Apple but was never shipped before the program was canceled. They were intended to be for the Apple II and Apple III computers but the Twiggy drive was only ever used in the Lisa I.
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