Seagate Constellation ES ST1000NM0011 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Enterprise Hard Drive Fifth-generation, enterprise, nearline drive designed for 247 operation 1TB capacity for data-hungry enterprise business applications Best-in-class enhanced rotational vibration tolerance ensures unrivalled performance in high-density applications for continuous data access. 6.0Gb/s SATA III performance with error detection and correction