Wiebetech RTX800-UR. Total storage capacity: 4000 GB, Hard drive capacity: 500 GB, RAID levels: 0, 1, 0+1, 3, 5, 6, JBOD. Weight: 14850 g. Compatible operating systems: Windows XP/Server 2003/Vista Mac OS X 10.2.6 Linux. Dimensions (WxDxH): 177 x 270 x 361 mm