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5 1/4" Floppy Disk
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Person: VGGeek (Promotional Images)

A floppy disk, also called a floppy, diskette, or just disk, is a type of disk storage composed of a disk of thin and flexible magnetic storage medium, sealed in a rectangular plastic enclosure lined with fabric that removes dust particles. Floppy disks are read and written by a floppy disk drive (FDD). Floppy disks were a ubiquitous form of data storage and exchange from the mid-1970s into the mid-2000s. By the late 2000s, computers were rarely manufactured with installed floppy disk drives.

First introduced in 1976 single sided disks were coated on both sides, despite the availability of more expensive double sided disks. The reason usually given for the higher cost was that double sided disks were certified error-free on both sides of the media. Double-sided disks could be used in some drives for single-sided disks, as long as an index signal was not needed.

The head gap of an 80‑track high-density 5¼‑inch drive (a.k.a. Mini diskette, Mini disk, or Minifloppy) is smaller than that of a 40‑track double-density drive but can format, read and write 40‑track disks well provided the controller supports double stepping or has a switch to do such a process. 5.25-inch 80-track drives were also called hyper drives.