When I go the PC it had the two 5.25 hard drives right together one on top of the other in the cage and they got very hot! The cage has four tabs sticking out the bottom, I guess to mount another cage, but the tabs also line up with the holes for mounting the drive...but only if I put it upside down (the holes in the tabs are too close to the bottom of the cage for me to attach the drive right side up). I went ahead and attached it, and it is now nice and cool (well, actually just not hot), but upside down.