WD RE WD2001FYYG 2 TB SAS 6 Gb/s 32 MB Cache Internal 3.5-inch Enterprise Hard Drive. "WD RE hard drives are engineered to offer data-hungry SAS storage systems the massive capacity they need without compromising top-of-the-line performance. Advanced reliability and data integrity features allow for 24x7 operation in tightly packed vibration prone multi-drive systems. This uncompromising combination of high-capacity peak performance and best-in-class reliability make WD RE drives ideal for business critical applications." SINGLE PACK