Hitachi G-SPEED eS. Total storage capacity: 4000 GB, Hard drive rotational speed: 7200 RPM, Maximum capacity: 12 TB. Cables included: AC, eSATA. Weight: 5700 g. Compatible operating systems: Mac OSX 10.3.x+ Windows 2000/XP/Vista/7. Dimensions (WxDxH): 124 x 210 x 166 mm