A 3.5" floppy disk
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A Floppy disk is a magnetic data storage device that is composed of a circular piece of thin, flexible (i.e. "floppy") magnetic storage medium encased in a square or rectangular plastic wallet. Floppy disks are read and written by a floppy disk drive. The disks were commonly formatted with the FAT12 file system.
The image in the infobox is a 3.5" floppy, and can hold up to 1.44 MB of data in "high-density" format, with 720 KB available in "low-density" format. An older floppy disk format is the 5.25" floppy. The 3.5" floppy disk format was introduced by Sony in 1982, with its Sony SMC-70 computer. 3.5" floppy disks would become the standard storage medium for personal computers up until the late 1990s, when they would begin to be succeeded by ZIP disks and CD-ROMs.
Dr. Yoshiro Nakamatsu, in Tokyo, conceived the idea of a floppy disk in 1950. He later received a Japanese patent for inventing a floppy disk in 1952, under the application number JP52011008, and received an American patent dated 1958. He later licensed 16 patents to IBM, confirmed by IBM spokesmen Mac Jeffery and Brian Doyle. IBM reached licensing agreements with Nakamatsu in the late 1970s.
The first commercial floppy disk was IBM's 8-inch floppy disk, introduced in 1972. In 1976, An Wang of Wang Laboratories invented a smaller 5¼-inch floppy disk, which became the standard floppy disk format from the late 1970s to the early 1980s.
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