Western Digital 320GB SATA 6Gb/s. Hard drive capacity: 320 GB, Hard drive interface: Serial ATA, Hard drive speed: 7200 RPM. Power consumption (standby): 0.2 W, Power consumption (read): 1.75 W, Power consumption (write): 1.75 W. Width: 2.75" (69.8 mm), Height: 0.374" (9.5 mm), Depth: 3.94" (100.2 mm). Data transfer rate: 6 Gbit/s