WD / HGST Ultrastar HE12 HUH721212AL4204 / 0F29562 / 0F29579 12TB 3.5" 12Gbps 7.2K RPM 4Kn Single Port SAS HDD

Western Digital Part #/MPN: HUH721212AL4204

DiscTech Item #: WDC-HUH721212AL4204-RF-OE


Enterprise Grade

Capacity: 12TB

Speed: 7,200RPM

Interface Types: SAS Serial Attached SCSI

Form Factor: 3.5inx1.0in LFF Hard Drive

Sector Size: 4Kn

Sustained Throughput: 243/255

Average Seek Time: 8.0/8.6

Electrical Interface: SAS-3 Serial Attached SCSI v3 - 12.0Gbps

On-Board Cache: 256MB

WD / HGST Ultrastar HE12 HUH721212AL4204 / HUH721212AL56S0 / 0F29562 / 0F29579 12TB 3.5" 12Gbps 7.2K RPM 4Kn Single Port SAS HDD - Refurbished

HGST Ultrastar HE12 / Western Digital HUH721212AL4204 / HUH721212AL56S0 / 0F29562 / 0F29579 12TB 3.5" 12Gbps 7.2K RPM 4Kn Single Port SAS HDD - Refurbished

More Value to the Data Center with Maximum Capacity, Power Efficiency and Reliability
Laying the foundation for a worry-free data center, HGST delivers capacity to conquer the data explosion – Ultrastar® He12 HDD. Designed to handle workloads up to 550TB per year, the Ultrastar He12 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 the lowest power profile in the industry to help data center architects meet eco-environmental goals and requirements. Targeted at 2.5M hours MTBF, the Ultrastar He12 HDDprovides the highest reliability rating available of all HDDs on the market today by building on the successful design of it’s 10TB, 8TB and 6TB predecessors. Trust HGST and the Ultrastar He12 HDD to deliver more capacity, more efficiency, more reliability and more value to your data center

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 He12 HDD is a best-fit for object storage implementations with its massive capacity and industry-leading reliability rating. Compliance and privacy requirements drive the need for increased data security. The Ultrastar He12 HDD offers security and encryption options to help protect data from unauthorized use, including TCG options on both SATA and SAS models.

HGST Quality and Service
The Ultrastar He12 HDD extends HGST’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. HGST drives are backed by an array of technical support and services, which may include customer and integration assistance. HGST is dedicated to providing a complete portfolio of HDD, SSD and systems to help the world harness the power of data.


  • 12TB capacity1 in a standard 3.5-inch form factor
  • PMR technology works with all capacity enterprise applications & environments
  • Reliable, field-proven, 4th generation design
  • Industry’s best power efficiency (Watts/TB)
  • Compared to 8TB air drives
  • 50% more capacity
  • 54% more power efficient (Watts/TB)
  • 25% more reliable
  • SATA 6Gb/s and SAS 12Gb/s
  • 12Gb/s SAS compatible with next gen data centers; backwards compatible with 6Gb/s SAS
  • 2.5M hours MTBF rating
  • Instant Secure Erase (ISE) & Self-Encrypting Drive (SED) options
  • Advanced Format 4Kn and 512e models


  • 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


This drive is compatible with any server that accepts 3.5inx1.0in SAS Drive.

  • Single Port SAS for servers only.
  • Does not support multi-path storage arrays.

Ultrastar He^12
Model NoHUH721212AL4204
InterfaceSAS 12Gb/s / Single Port SAS - Does not support dual path. (Physical connector is SATA type)
Capacity12TB / 12000GB
Format Sector Size (bytes)4Kn: 4096, 4112, 4160, 4224
Max. Areal density (Gbits/sq. in)864
Data buffer (MB)256
Rotational Speed7200
Latency average (ms)4.16
Interface transfer rate ((MB/s, max)1200
Sustaned transfer rate
MiB/s, typical
)MB/s, typical)

Seek time (read/write, ms typical)8.0/8.6
Error rate (non-recoverable, bits read)1 in 10^15
Load/Unload cycles (at 40°C)600,000
Availability (hrs/day x days/wk)24x7
Annualized Failure Rate (AFR)0.35%
Idle (Bels, typical)2.0/3.6
Requirement+5 VDC, +12VDC d
Operating (W)9.8
Idle (W)6.1
Power consumption efficiency at idle (W/TB)
z-height (mm)26.1
Dimensions (width x depth, mm)101.6(+/-0.25)x147
Ambient temperture5° to 60°C
Shock(half-sine wave 2 ms, G)70
Vibration(G RMS 5 to 500 Hz)0.67(XYZ)
Ambient temperature-40° to 70°C
Shock(half-sine wave 2 ms, G)33(2ms)/150(11ms)
Random vibration (G RMS 2 to 200 Hz1.04 (XYZ)

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ROHS Compliant

Alternate MPNs: 0F29579 0F29562

Weight: 1.8 lb

Warranty: 1 Year DiscTech


Condition Levels Explained

These products have had NO problems or failures, they merely have some usage. The product has been professionally returned to excellent condition. These items have been fully tested, formatted (if appropriate) &repackaged. Hard drives are fully vetted for surface defects and wear, only healthy disks are approved for resale to our customers. Please see our refurbishing process for more details. Watch a video about our refurbishing process

1 Year DiscTech Warranty

Product Warranties Explained

The product has a DiscTech warranty for the time period specified. View our limited warranty