On a modern PC there will be at least 3 drives .
Every modern computer has a CD-ROM drive for access to high capacity compact discs.
Since you can not save data on ordinary compact discs, you will also have a floppy disk drive. Floppy disks are an old technology you'll probably only use if you need to transfer data to another computer. Finally, you will have a hard disk . The hard disk is the computer's main internal storage. You can not see the hard disk without opening the computer.