The width and depth of Big Data drive the overall demand for higher capacities across a wide range of applications and workloads. Western Digital lays the foundation for a worry-free data center, offering the capacity to handle the data explosion with the Ultrastar DC HC500 series hard drives. The DC HC500 series is designed for public and private cloud environments where storage density and cost-effective infrastructure are critical. The 18 TB/16 TB Ultrastar DC HC550 hard drives are the first commercial implementation of energy-assisted magnetic recording technology and utilize the industry's first three-stage actuator. These technologies, integrated with HelioSeal on a 9-disk platform, deliver the highest areal density and unmatched total cost of ownership for customer and market demands. Extreme durability: CMR hard drive with 18 TB for hyperscale, cloud, and enterprise storage.