Dell 4TB 7.2K 6Gbps 3.5'' SAS Hard Drive with 3.5'' R-Series Tray for PowerEdge R310, R410, R510, R710, T310, T410, T610, T710 Capacity and Speed: 4TB 7.2K Transfer Rate: 6Gbps Interface: SAS Class: Enterprise Form: 3.5 Inch