Seagate Constellation ES 1 TB 7200RPM SATA 2.0 3Gb/s 32 MB Cache 3.5 Inch Internal Hard Drive ST31000524NS - Bare Drive Fourth-generation, enterprise, nearline drive designed for 247 operation 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 (up to 92 percent) during slow or idle periods Proven reliability with multi-drive firmware maximized for enterprise system availability Ships in Certified Frustration-Free Packaging