In its quest to create a small and potent mini barebones system, Shuttle had to come up with a few unique approaches to its design of the SV-24. Along with its limited space is the limited "elbow room" that plays a role in putting together a complete rig. One approach was the installation of the hard drive using a sliding tray assembly. This was the perfect way to deal with some of the larger components that need to be installed by the end-user. Once the hard drive is mounted to the tray, it simply slides into place and is secured with two thumb screws. Another issue to contend with is excessive heat. Shuttle did find room to locate a case fan on the rear of the unit which would be directly behind the 5 1/4" bay. With a series of vent holes in the lower front of the case, this was the optimal way to achieve decent airflow in such a limited space.
FULL STORY @ HOTHARDWARE (http://www.hothardware.com/hh_files/Motherboards/shuttle_sv24.shtml)