Hard drives can be mounted in several areas in the Antec NSK 3480. There are two dedicated areas that feature silicon vibration dampeners to isolate the hard drives to reduce any noise from them. One is available in the upper compartment and will take up the space of one 5.25" bay. The other is on the floor of the enclosure and is similarly attached. If a floppy drive will not be used, this area can house another drive if need be.