diskette - A diskette is a random access, removable data storage medium that can be used with personal computers. The term usually refers to the magnetic medium housed in a rigid plastic cartridge measuring 3.5 inches square and about 2 millimeters thick. Also called a '3.5-inch diskette,' it can store up to 1.44 megabytes (MB) of data. Although many personal computers today come with a 3.5-inch diskette drive pre-installed, some notebookcomputers and centrally-administered desktop computers omit them. Magnetic diskettes are convenient for storing individual files and small programs. Source: SearchStorage.com