Seagate Momentus 5400 500GB 5400RPM SATA 3Gb/s 8MB Cache 2.5 Inch Internal NB Hard Drive ST9500325AS-Bare Drive 5,400 RPM Spin Speed, 8 MB Cache Buffer SATA 3.0Gb/s Interface, 500 GB Capacity Average latency 5.6 msec, Random read seek time 14 msec Best-Fit Applications; Mainstream laptops, External storage solutions/boxes, Industrial applications requiring a smaller form factor Ships in Certified Frustration-Free Packaging SATA 3.0Gb/s Interface, 500 GB Capacity. Three Year Warranty