Laying the foundation for a worry-free data center, Western Digital delivers capacity to conquer the data explosion - Ultrastar DC HC520, previously known as Ultrastar He12 and part of the HC500 series of helium-filled hard drives. Designed to handle workloads up to 550TB per year, the Ultrastar DC HC520 is the industry's first 12TB drive and uses traditional perpendicular magnetic recording (PMR) technology to make it dropin ready for any enterprise-capacity application or environment. The stable internal environment created by fourth-generation HelioSeal technology enables an 8-disk design, increasing the capacity by 20% when 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 design of its 10TB, 8TB and 6TB predecessors. Trust Western Digital and the Ultrastar DC HC520 to deliver more capacity, more efficiency, more reliability and more value to your data center.
- HelioSeal technology helps solve challenges facing next generation data centers
Data centers are facing growing pressures. Data volume is expanding, operating costs are rising, yet budgets remain flat. Lowering the total cost of ownership (TCO) has become the focus of data center architects and the Ultrastar DC HC520 provides the best value proposition and greatest storage efficiency available. Compared to 8TB Ultrastar air-filled drives, this HelioSeal hard drive provides 50% more capacity, uses 52% less power (Watts/TB), and is 25% more reliable, rated at 2.5M hours MTBF. Datacenter ready features like a second generation dual-stage actuator - the Western Digital Micro Actuator - enhance head-positioning accuracy to deliver better performance, data integrity and overall drive reliability, especially in multi-drive environments where operational vibration is present.
- Data durability and data security to support compliance and privacy requirements
As drive capacity grows beyond single-digit TBs, object storage systems with erasure coding provide better data durability compared to RAID systems, given its tolerance for simultaneous error conditions. The Ultrastar DC HC520 is a best-fit for object storage implementations with its massive capacity and unbeaten reliability rating. Compliance and privacy requirements drive the need for increased data security. The Ultrastar DC HC520 offers security and encryption options to help protect data from unauthorized use, including TCG SAS models.
- Western Digital quality and service
The Ultrastar DC HC520 extends Western Digital's long-standing tradition of reliability leadership with a 2.5M-hour MTBF rating. Ultrastar quality, capacity, power efficiency, and world-class technical support and service provide customers with a lower total cost of ownership over previous generations. Western Digital data center drives are backed by an array of technical support and services, which may include customer and integration assistance. Western Digital is dedicated to providing a complete portfolio of products and services to help create environments for data to thrive.
Hard drive - internal
Perpendicular Magnetic Recording (PMR), Instant Secure Erase (ISE), Enterprise, 24x7 availability
Drive Transfer Rate
1.2 GBps (external)
1 per 10^15
Load / Unload Cycles
Expansion & Connectivity
1 x SAS 12 Gb/s
9.8 Watt (active) ¦ 6.1 Watt (idle)
Service & Support
Limited warranty - 5 years
Min Operating Temperature
Max Operating Temperature
Min Storage Temperature
Max Storage Temperature
Shock Tolerance (operating)
70 g @ 2 ms half-sine wave
Shock Tolerance (non-operating)
300 g @ 2 ms half-sine wave
Vibration Tolerance (operating)
0.67 g @ 5-500 Hz
Vibration Tolerance (non-operating)
1.04 g @ 2-200 Hz