Seagate Momentus 7200 500GB 7200RPM SATA 3Gb/s 16MB Cache 2.5 Inch Internal NB Hard Drive ST9500420AS-Bare Drive Two Year Warranty Best-Fit Applications; High-performance and mainstream laptop PCs, Small form factor PCs, Workstations, Industrial applications SATA 3.0Gb/s Interface, 500 GB Capacity 7,200 RPM Spin Speed,16 MB Cache Buffer Average latency 4.17 msec, Random read seek time 11.0 msec, Random write seek time 13.0 msec 7,200 RPM Spin Speed,16 MB Cache Buffer SATA 3.0Gb/s Interface, 500 GB Capacity Average latency 4.17 msec, Random read seek time 11.0 msec, Random write seek time 13.0 msec Best-Fit Applications; High-performance and mainstream laptop PCs, Small form factor PCs, Workstations, Industrial applications