Western Digital' RE4 edition allows the highest performance amongst the entire RE family. This WD RE4 (WD5003ABYX) Internal Hard Drive is ideal for servers as well as write-intensive applications. With an rpm of 7200, SATA interface, it features 4th generation vibration tolerance. This 500GB HDD offers 64 MB of cache memory and boasts of a dual processor, thus enabling fast performance even during use of demanding server and storage applications. The WD RE4 edition is designed to provide total reliability to its users 24x7. It makes use of Enhanced RAFF technology to deliver excellent performance in high vibration environment. The hard drives make use of multi-axis shock sensor, which can detect even the subtlest of shocks and thus help protect data.