This chapter is relevant as many CPC users are using PC floppy drives on their CPC.
=== 5.25inch PC diskette format ===
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-AT. 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.
=== 3.5inch PC diskette format ===
The IBM PS/2 introduced two standard 3.5 inch diskette formats: