HGST MegaScale DC 4000.B 4TB, Ultrastar. Hard drive capacity: 4000 GB, Hard drive interface: Serial ATA III, Hard drive size: 3.5". Power consumption (read): 6.2 W, Power consumption (write): 6.2 W, Power consumption (idle): 4.9 W. Width: 4" (101.6 mm), Height: 1.03" (26.1 mm), Depth: 5.79" (147 mm). Data transfer rate: 6 Gbit/s