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/* PC Floppy Drive types */
The IBM PC supports two standard diskette formats on a 5.25 inch drive:
* The first is double sided, double density, 40 cylinders, which yields a capacity of 360KB per diskette. This is the original IBM PC format. The double density drive rotates at 300 RPM.
* The second format was introduced with the PC/ATin 1984. It is double sided, quad density, 80 cylinders, with a total capacity of 1.2 MB. The high density drive rotates at '''360 RPM''', so only 15 sectors can be written on a track instead of 18.
The IBM PS/2 introduced two standard 3.5 inch diskette formats:
