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Floppy disk drives and optical drives in the chassis, only their "mouth" sticking out, ready to "eat" floppy disks and CDs. 

Hard disk, because it is not removable, it is mounted in the drive, that is, hard disks and hard disk drives are one and the same. Note to insert a floppy disk into the floppy disk drive, 3.5-inch disks when you insert the hinge should be facing down, metal chips forward, hear the drive eject button at the bottom "click" heard pop, indicating floppy disk inserted.