Toshiba 320GB SATA II 2.5". Hard drive capacity: 320 GB, Hard drive interface: Serial ATA II, Hard drive speed: 5400 RPM. Power consumption (standby): 0.18 W, Power consumption (read): 1.5 W, Power consumption (write): 1.5 W. Width: 2.75" (69.8 mm), Height: 0.374" (9.5 mm), Depth: 3.94" (100 mm). Power requirements: +5 V (+/- 5 %), Data transfer rate: 3 Gbit/s