Seagate Momentus 250 GB 5400RPM SATA 3Gb/s 8 MB Cache 2.5-Inch Internal Notebook Hard Drive - Retail Kit ST90250N1A1AS-RK 250GB storage capacity Up to SATA III, 6Gb/s interface QuietStep technology enables ultra-quiet load/unload acoustics Best-Fit Applications; Mainstream laptops, External storage solutions/boxes Perpendicular recording technology increases performance and reliability Seagate Smart Align technology provides a transition to 4K sectors without the need for software utilities