HGST 7K4000 4TB, Ultrastar. Hard drive capacity: 4000 GB, Hard drive interface: Serial ATA III, Hard drive speed: 7200 RPM. Power consumption (read): 11.4 W, Power consumption (write): 11.4 W, Power consumption (idle): 5.7 W. 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, Connectivity technology: Wired