Western Digital RE 3TB 3.5" Serial ATA III

WD RE Enterprise SATA Hard DrivesIdeal for enterprise servers and storage. video surveillance. and other write-intensive applications. WD RE 7200 RPM Enterprise SATA hard drives offer up to 4 TB capacity.64 MB cache. 4th generation vibration tolerance and 5-year limited warranty.A head positioning system with two actuators that improves positional accuracy over the data track(s). The primary actuator provides coarse displacement using conventionalelectromagnetic actuator principles. The secondary actuator uses piezoelectricmotion to fine tune the head positioning to a higher degree of accuracy.