Western Digital Red Pro. Hard drive capacity: 8000 GB, Hard drive interface: Serial ATA III, Hard drive speed: 7200 RPM. Power consumption (standby): 0.7 W, Power consumption (read): 8.3 W, Power consumption (write): 8.3 W. Width: 4" (101.6 mm), Height: 1.03" (26.1 mm), Depth: 5.79" (147 mm)