Laying the foundation for a worry-free data center, HGST delivers capacity to conquer the data explosion – Ultrastar DC HC520. Designed to handle workloads up to 550TB per year, the Ultrastar DC HC520 HDD is the industry's first 12TB drive and uses PMR technology to make it drop-in ready for any enterprise-capacity application or environment. The stable internal environment created by fourth-generation HelioSeal technology enables a new 8-disk design, increasing the capacity by 20% when compared to the 7-disk design of the prior generation. This highest 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 HDD provides the highest reliability rating available of all HDDs on the market today by building on the successful design of its 10TB, 8TB and 6TB predecessors. Trust HGST and the Ultrastar DC HC520 HDD to deliver more capacity, more efficiency, more reliability and more value to your data center. Cache 256 MB Capacity 10TB Form Factor 3.5-inch Enterprise Hard Drive Interface 6GB /s Misc.