content: Close, but not quite. The original IBM PC came with two 5 1/4" full-height drive bays and as you say no hard drive available. Serious work required much floppy disk swapping. If you wanted to duplicate a floppy w/o swapping you would get both A: and B:drives. Later on floppy drives went to half height, so you could have two in a single bay, with a hard drive in your second bay. The 3 1/2" floppy was a later innovation.