Seagate Constellation ES 500 GB 7200RPM SATA 6Gb/s 64MB Cache 3.5 Inch Internal Bare Drive (ST500NM0011) Fifth-generation, enterprise, nearline drive designed for 247 operation 500 GB capacity Best-in-class enhanced rotational vibration tolerance ensures unrivalled performance in high-density applications for continuous data access. SATA 6Gb/s Best-in-class enhanced rotational vibration tolerance ensures unrivalled performance in high-density applications for continuous data access. Enhanced efficiencies with PowerChoice host-selectable power options for unprecedented savings during slow or idle periods Seagate RAID Rebuild development platform significantly reduces hours of lost productivity. Multi-drive firmware maximized for enterprise system availability