The StorDigital DataBox Duo Enclosure is a 2 bay external USB2.0 hard drive enclosure with space for 2 x 500GB SATA hard disk drives. The in-built RAID/JBOD allows two physical drives to be used/viewed as one logical drive with a potential storage capacity of up to 1TB. We have tested these enclosures extensively in our London facility and they have been the perfect addition to the average desktop. Offering space for up to 1TB of storage the DataBox will free up your computers hard drive and make it work quicker. Archive all those music tracks and digital photos from your crazy nights out. The big plus with this enclosure over competitive products is that whilst it has a low price it offers fantastic build quality. It is as well suited to the floor as it is to the desktop and has a rugged appearance and robust build. It looks good, feels good and works great. Highly recommended. THIS UNIT IS THE ENCLOSURE ONLY AND DOES NOT INCLUDE DRIVES