HGST Deskstar 3TB 3.5-Inch 7200RPM SATA III 6Gbps 64 MB Cache Internal Hard Drive (0F12450) 3TB Hard Drive Storage Capacity 7200 RPM, 64MB Cache and SATA III 6Gbps Built on award-winning proven design Halogen-Free Design Compatible as Expansion Hard Drive for Windows 7 and Vista, Will not work with Windows XP or as boot drive