Toshiba MK2555GSX. Hard drive interface: Serial ATA II, Hard drive capacity: 250 GB, Hard drive size: 6.35 cm (2.5"). Power consumption (typical): 4.5W, Power consumption (standby): 0.18W, Power consumption (off): 0.13W. Width: 6.985 cm, Height: 9.5 mm, Depth: 10 cm. Dimensions (WxDxH): 69.85 x 100 x 9.5 mm, Data transfer rate: 3 Gbit/s, Track density: 576.4Mbit/mm