Dell certified enterprise class SATA drive. With double the processing power, WD RE4 boasts the highest performance of any drive in the WD RE family. WD RE4 7200 RPM Enterprise SATA hard drives are packed with performance and reliability features. With a designed, manufactured and demonstrated MTBF of 1.2 million hours at 100% duty cycle in nominal enterprise conditions, and best-in-class vibration tolerance, these drives are the ultimate in Enterprise SATA storage.