Drives usually have a letter to represent them in the operating system.
	In DOS and Windows PC’s the floppy drives have the letter A, or if there are two, the letters A and B
	Hard Drives, CD ROMS Drives and other devices start with the letter C and go up: C, D, E, etc.
	Each different drive has its own letter. The main or boot Hard Drive usually has the letter C
	However one physical device or drive may be separated into several logical devices each of which can have a letter
	For example one physical drive can be partitioned into several logical drives.