HGST Ultrastar 7K4000 3TB, Ultrastar. Hard drive capacity: 3000 GB, Hard drive interface: SAS, Hard drive speed: 7200 RPM. Width: 4" (101.6 mm), Height: 1.03" (26.1 mm), Depth: 5.79" (147 mm). Hard disk transfer rate: 600 Mbit/s, Data transfer rate: 6 Gbit/s