Seagate Momentus 500 GB 7200RPM SATA 3Gb/s 16 MB Cache 2.5-Inch Internal Notebook Hard Drive - Retail Kit ST905003N3A1AS-RK QuietStep technology enables ultra-quiet load/unload acoustics SATA 3Gb/s interface with Native Command Queuing Perpendicular recording technology Perfect for laptop and small form factor PC and Mac computers