Have you seen a floppy? Floppies were a type of disk storage used earlier, before the current system of storage came into existence. Floppy disk drives were named with the letters A and B. When hard disk drives became standard in most computers, they were logically labelled 'C' since the first two letters were already used for these floppy drives. Though floppy disk drives are no longer widely used, hard disks are still labelled from 'C' onwards.
