LaCie 4 TB Biggest Quadra. Total storage capacity: 4000 GB, Hard drive capacity: 1000 GB. Bundled software: EMC Retrospect Express advanced backup & data restore. Weight: 11500 g. Compatible operating systems: Windows 2000, Windows Server 2003, Windows XP, Windows Vista / Mac OS 10.2.8. Dimensions (WxDxH): 152.8 x 268.5 x 206.4 mm