Seagate 4TB SATAIII, Barracuda. Hard drive capacity: 4000 GB, Hard drive interface: Serial ATA III, Hard drive size: 3.5". Power consumption (typical): 5.6 W, Power consumption (standby): 0.5 W, Power consumption (off): 0.5 W. Width: 4" (101.6 mm), Height: 0.794" (20.2 mm), Depth: 5.79" (147 mm)