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.
In the early 1980s, a number of manufacturers introduced smaller floppy drives and media in various formats. A consortium of 21 companies eventually settled on a 3½-inch floppy disk. Other smaller floppy sizes were proposed, especially for portable or pocket-sized devices that needed a smaller storage device. 3-inch disks similar in construction to 3½-inch were manufactured and used for a time, particularly by Amstrad computers and word processors.