HP 516816-B21. Hard drive capacity: 450 GB, Hard drive size: 8.89 cm (3.5"), Hard drive speed: 15000 RPM. Width: 17.8 cm, Height: 11.8 cm, Depth: 22.9 cm. Data transfer rate (max): 600 Mbit/s, Data transfer rate: 4.7 Gbit/s