WD 12TB Ultrastar DC HC520 Hard Drive 3.5 SATA HDD, 7200RPM

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More Value to the Data Center with Maximum
Capacity, Power Efficiency and Reliability

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 our 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 a new 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. Refer to our technical brief to learn more. A choice of
6Gb/s SATA and 12Gb/s SAS interface enables easy integration into high performance
data centers.

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 and a 5-year limited warranty. Ultrastar quality,
capacity, power efficiency, and world-class technical support and service provides
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.

Enterprise-class Hard Drives

Ultrastar SATA Series

Ultrastar hard drives feature up to 10 times the workload rating* of desktop drives and employ advanced technologies for enterprise-class reliability, power efficiency and performance. Designed from the ground up to be an ultra-robust storage device, Ultrastar drives are the perfect solution for your business.

*as compared to 55TB/yr workload rating on desktop-class drives

Designed with a workload rating up to 550TB per year
Up to 2.5M hours MTBF
5 generations of HelioSeal technology (in 10TB and above models)
RVS technology for vibration protection
RAID-specific time-limited error recover (TLER)


High workload rating Delivering dependable performance to any storage environment, Ultrastar hard drives are designed with a workload rating* up to 550TB per year, up to 10 times the rating for desktop drives. Ultrastar drives employ advanced technologies for enterprise-class reliability, power efficiency and performance. *as compared to 55TB/yr workload rating on desktop-class drives	Enterprise-class storage to rely on With up to 2.5 million hours MTBF, Ultrastar hard drives deliver reliability and durability, are built for yearly operation (24x7x365) within the most demanding storage environments, and are backed with a 5 year limited warranty.	HelioSeal Technology Featured in over 30 million Western Digital hard drives shipped, HelioSeal technology (on 10TB drives and above) allows for higher capacities and less turbulence on large storage arrays. And now on its 5th generation design, HelioSeal technology is field-tested and proven to delivery high capacity, reliability, and power efficiency you can trust.


Vibration Protection Enhanced Rotational Vibration Safeguard (RVS) technology uses sophisticated electronics to monitor the drive and correct linear and rotational vibrations in real time for improved performance versus traditional desktop drive in high vibration environments.	Dual-stage Actuator Technology Ultrastar drives feature a dual-stage actuator head positioning system for a high degree of accuracy. The primary stage provides course displacement while the secondary stage uses piezoelectric motion to fine tune the head positioning to a higher degree of precision.	Dynamic fly height technology Each read-write head’s fly height is adjusted in real time to ensure consistent performance for reduced errors and optimized reliability.