Western Digital 320 GB RE3 SATA 7200 RPM 16 MB Cache Bulk/OEM Enterprise Hard Drive WD3202ABYS Packed with performance and reliability features; ideal for servers, video surveillance, and other demanding write-intensive applications Dual processors provide twice the processing power, and results in a 20% performance improvement over the previous generation. Thermal extended burn-in tested - each drive is put through extended burn-in testing with thermal cycling to ensure reliable operation.