Western Digital Blue. Hard drive capacity: 500 GB, Hard drive interface: Serial ATA III, Hard drive speed: 7200 RPM. Power consumption (standby): 1.2 W, Power consumption (read): 6.8 W, Power consumption (write): 6.8 W. Width: 4" (101.6 mm), Height: 1" (25.4 mm), Depth: 5.79" (147 mm)