Western Digital Blue PC Mobile. Hard drive capacity: 320 GB, Hard drive interface: Serial ATA III, Hard drive speed: 5400 RPM. Power consumption (standby): 0.16 W, Power consumption (read): 1.4 W, Power consumption (write): 1.4 W. Width: 2.75" (69.8 mm), Height: 0.276" (7 mm), Depth: 3.94" (100.2 mm)