The StarTech.com 8-bay SCSI3 external drive case provides a fast and easy way for PC or Mac users to add up to 8 additional 68 pin hard drives, DVD-RAM, or tape backup drives to their system. It provides 2 5.25 inch bays for SCSI3 devices. 3.5 inch hard drives can be installed by using a 5.25 to 3.5 inch drive adapter bracket. The sleek looking case features a built-in 250W power supply with high capacity cooling fan to keep the drives running cool.