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A floppy disk is a data storage medium that is composed of a disk of thin, flexible "floppy" magnetic storage medium encased in a square or rectangular plastic shell. In 1971 while working at IBM, David L. Noble invented the 8-inch floppy disk. Floppy disks in 8-inch, 5¼-inch, and 3½-inch formats enjoyed many years as a popular and ubiquitous form of data storage and exchange, from the mid-1970s to the late 1990s.