Western Digital Purple. Hard drive capacity: 2000 GB, Hard drive interface: Serial ATA III, Hard drive speed: 5400 RPM. Power consumption (off): 0.4 W, Power consumption (read): 4.4 W, Power consumption (write): 4.4 W. Width: 4" (101.6 mm), Height: 1.03" (26.1 mm), Depth: 5.79" (147 mm)