Seagate Constellation 160 GB 7200 RPM SATA 3Gb/s 32MB Cache 2.5 Inch Internal Bare Drive ST9160511NS 160GB Capacity and 32-MB Cache Industrys leading 2. 5-inch, mainstream capacity, 15mm enterprise-class near line drive for dense, space-constrained data centers Lowest operating power at less than 4 watts and up to 54 percent additional idle power savings with host-selectable, on-demand Power Choice feature Industrys highest-reliability in a 7200-RPM drive with a 1. 2M-hour mean-time-between-failure (MTBF) rating thats designed for 24x7 operation Best-in-class rotational vibration tolerance ensures unrivalled performance in high spindle-density applications, and multi-drive firmware maximizes system availability SATA 3Gb/s for fast, yet economical Tier 2/near line performance 160GB Capacity and 32-MB Cache Industrys leading 2.5-inch, mainstream capacity, 15mm enterprise-class near line drive for dense, space-constrained data centers Lowest operating power at less than 4 watts and up to 54 percent additional idle power savings with host-selectable, on-demand Power Choice feature Industrys highest-reliability in a 7200-RPM drive with a 1.2M-hour mean-time-between-failure (MTBF) rating thats designed for 24x7 operation Best-in-class rotational vibration tolerance ensures unrivalled performance in high spindle-density applications, and multi-drive firmware maximizes system availability SATA 3Gb/s for fast, yet economical Tier 2/near line performance