Laying the foundation for a worry-free data center, Wester Digital delivers capacity to conquer the data explosion - Ultrastar DC HC520, previously known as Ultrastar He12 and part of our HC500 series of helium-filled hard drives. Designed to handle workaloads up to 550TB per year, the Ultrastar DC HC520 is the industry's first 10TB drive and uses stranditional perpendicular magnetic recoding (PMR) technology to make it drop-in ready for any enterprise-capacity application or environment. The stable internal environment created by foruth-generation HelioSeal technology enables a new 8-disk design, increasing capacity by 20% compared to the 7-disk design of the prior generation, Ultrastar DC HC510. This high capacity helium drive offers one of the lowest power profiles in the industry to help data center architects meet eco-environmental goals and requirements. Targeted at 2.5M hours MTBF, the Ultrastar DC HC520 provides the highest reliability rating available of all HDDs on the market today by building on the successful deisn of it's predecessors. Trust Western Digital and the Ultrastar DC HC520 to deliver more capacity, more efficiency, more reliability and more value to your data center.