In the Macintosh universe, program files are called applications . Diskettes Diskettes are the primary medium used for storing and transferring data, other than a hard disk. The medium itself is a round disc made out of an oxide like material similar to that used to make a magnetic tape. The disc is enclosed in a square, plastic sleeve with a window or access hole through which the data is read from, or written to the diskette. Data is stored on the diskette like the music on an LP record.
Diskettes come in two sizes.
You must, of course, have the appropriate size diskette for the diskette drive on your computer. The size of the diskette, however, does not have any bearing on how much data can be stored on the diskette. That is instead a function of recording density and how the disk has been formatted. Single vs. Double sided Diskettes . When diskettes were first designed they could only be recorded on one side.