The same goes for the floppy drives cage – it already has rails, so you only have to remove an appropriate faceplate to put a floppy drive in.
Hard drives are installed sideways onto special trays assembled in a single rack:
You can put in as many as five hard drives in total, and none of them is going to gasp for air: the rack with the drives is cooled with the front-panel 120mm fan and the distance between the drives allows for free circulation of the air stream. A hard drive is fastened on a tray with special screws and through shockproof pads.
When assembled, the whole arrangement is moved into the rack and snapped in place.