Seagate ST3500320NS. 500 Gigabyte SATA 3G Enterprise Storage 7200 rpm 32MB Cache Bare Drive The industrys highest-reliability 7200-RPM drive, 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. Seagate PowerTrim technology dynamically optimizes power consumption by improving GB/watt by 55 percent and by reducing overall drive power consumption by 20 percent over prior-generation Barracuda ES drives Multi-drive firmware features and best-in-class rotational vibration (RV) tolerance maximizes system availability and performance in multi-drive systems. Seagate proprietary Workload Management technology helps systems keep drives cool Barracuda ES.2 High-capacity, business-critical Tier 2 enterprise drives