From the manufacturer, WD 8TB Ultrastar DC HC320 SATA HDD 7200RPM SATA 6 Gb/s 256MB Cache: Enterprise-class hard drives The Ultrastar SATA Series Ultrastar hard drives use cutting-edge technologies for enterprise-class performance, power efficiency, and dependability, and they can handle up to ten times the workload rating* of desktop drives. Originally intended to be an ultra-ro