A 5 1/4-inch-diameter floppy diskette, used as a mass storage device with a microcomputer. Microcomputers use 8-inch, 5 1/4-inch, and 3 1/2-inch diskettes. The 8-inch diskette is called a floppy diskette, the 5 1/4-inch diskette is called a minifloppy, and the 3 1/2-inch diskette is called a microfloppy.