Seagate 1TB Constellation SATA 6Gb/s 64MB Cache 2.5-Inch Internal Bare Drive (ST91000640NS) Highest capacities and best reliability available in an SFF, 7200-RPM enterprise-class nearline drive Best-in-class rotational vibration tolerance ensures unrivaled performance in high spindle-density applications, and multi-drive firmware maximizes system availability SATA 6Gb/s for economical 7200-RPM performance 2.5-inch 1TB capacity-optimized drive for dense, space-constrained data centers allows you to store twice as much data in the same footprint Not intended for laptops