WD Ultrastar 12TB 256MB – HUH721212ALE604

SKU: 0F30146

Out of stock


Out of stock

Image result for HUH721212ALE604 - 0F3014612TB | 7200 RPM | SATA 6Gb/s and SAS 12Gb/s

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 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, 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.


  • 12TB capacity1 in a standard 5-inch form factor
  • PMR technology works with all capacity enterprise applications & environments
  • Reliable, field-proven, 4th generation design
  • Outstanding power efficiency (Watts/TB)
  • Compared to 8TB Ultrastar air drives

— 50% more capacity

— 52% more power efficient (Watts/TB)

— 25% more reliable (MTBF)

  • SATA 6Gb/s and SAS 12Gb/s

— 12Gb/s SAS compatible with next-gen data centers; backwards compatible with 6Gb/s SAS

  • 5M hours MTBF2 rating & 5-year limited warranty
  • Instant Secure Erase (ISE) & Self-Encrypting Drive (SED) options

Advanced Format 4Kn and 512e models

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. Data- center 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 and data center applications where capacity density, power efficiency and reliability are paramount
  • Cloud & Hyperscale storage
  • Massive scale-out (MSO), high-density data centers
  • Distributed File Systems
  • Bulk storage using object storage solutions like CEPH™ and OpenStack Swift
  • Primary and secondary storage for Hadoop® to support Big Data Analytics
  • Centralized video surveillance

Ideal for all mainstream enterprise capacity applications

Features & Benefits

Feature / Function


Capacity 12TB Provides 50% more capacity than 8TB drives
Power Efficiency Ultra-low Watts per terabyte (W/TB) 52% lower idle W/TB than 8TB Ultrastar air-filled drives
  • Dual-Stage Micro Actuator
  • Rotational Vibration Safeguard (RVS)
  • Media Cache Plus architecture
  • Rebuild Assist mode
  • SATA 6Gb/s & SAS 12Gb/s
  • 256MB cache buffer
  • More accurate head positioning, especially in multi-drive environments, for better performance, data integrity and reliability
  • Maintains drive performance in high rotational vibration environments and multi-drive systems
  • Better random write performance
  • Dramatically improves RAID recovery time and maintains system performance during recovery
  • Provides compatibility with high-performance data centers
  • Improves response time and data management
  • Dual safe firmware
  • 2.5M hours MTBF2 and 0.35% AFR2
  • 3-year limited warranty
  • Retains previous firmware version for safe firmware updates, verified with an RSA signature
  • Industry’s highest reliability rating for Capacity
  • Enterprise HDD for fewer failures/less service needs
  • Industry’s best for enterprise-class hard drives
Data Security
  • Instant Secure Erase
  • Encryption options on SAS models
  • Enables swift and efficient drive redeployment and retirement
  • Hardware-based encryption protects data from unauthorized use (TCG SAS options)



Model No. HUH721212ALE604


Interface SATA 6Gb/s
Format: Sector size3
4Kn: 4096
512e: 512
Max. Areal density (Gbits/sq. in.) 864


Data buffer4
Rotational speed (RPM) 7200
Latency average (ms) 4.16
Interface transfer rate (MB/s, max) 600
Sustained transfer rate5

(MiB/s, typical)
(MB/s, typical)



Error rate (non-recoverable, bits read) 1 in 1015
Load/Unload cycles (at 40ºC) 600,000
Availability (hrs/day x days/wk) 24×7
(M hours)
Annualized Failure Rate2
Warranty (yrs) 5


Idle (Bels, typical) 2.0/3.6


Requirement +5 VDC, +12VDC
Operating7 6.9
Idle8 (W)  5.0
Power consumption efficiency at Idle (W/TB)

Physical size

z-height (mm) 26.1
Dimensions (width x depth, mm) 101.6 (+/-0.25) x 147
Weight (g, max)  660

Environmental (Operating)

Ambient temperature
to 60º
Shock half-sine wave 2 ms, G) 70
Vibration (G RMS 5 to 500 Hz) 0.67 (XYZ)

Environmental (Non-Operating)

Ambient temperature -40º
to 70º
Shock (half-sine wave, G) 300 (2ms) / 150 (11ms)
Random vibration
(G RMS 2 to 200 Hz)
1.04 (XYZ)

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