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A silver 3.5 inch hard drive with a circuit board visible underneath

Western Digital

Western Digital Ultrastar HC520 12TB 7200RPM SAS internal hard drive HUH721212AL4204

SKU CH-DZH3-G32SM

A 12 TB enterprise hard drive with helium-sealed design, 7200 RPM speed and 256 MB cache for data-centre workloads

  • 12 TB capacity in a 3.5-inch form factor
  • Helium-sealed design lowers power consumption per terabyte
  • 256 MB cache boosts data transfer speeds
  • SAS 12 Gbps interface for enterprise connectivity
  • 7200 RPM rotational speed enables fast data access

Enterprise 12 TB SAS drive

The Western Digital Ultrastar HC520 is a 12 TB internal hard drive built for enterprise storage arrays and data centres. Its 7200 RPM spindle and SAS interface deliver the throughput needed for cloud repositories, big-data workloads and high-capacity archiving.

Sustained workload behaviour

A helium-sealed design reduces internal turbulence, lowering power draw per terabyte by 54 % compared with 8 TB air-filled drives. Rotational-vibration safeguards and 256 MB cache keep sequential performance stable during long write streams and heavy multi-user access.

Build quality and connectivity

The 3.5-inch form factor fits standard drive bays and backplanes using a SAS connector. PMR recording on a field-proven fourth-generation platform adds 25 % more reliability, while the sealed helium chassis improves thermal consistency in dense rack deployments.

Points forts

  • 12 TB capacity in a 3.5-inch form factor
  • Helium-sealed design lowers power consumption per terabyte
  • 256 MB cache boosts data transfer speeds
  • SAS 12 Gbps interface for enterprise connectivity
  • 7200 RPM rotational speed enables fast data access

Caractéristiques

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Questions sur cet article

How much heat does the 12TB 7200RPM SAS drive generate when running continuously?

The helium-sealed design reduces power consumption, delivering industry-leading power efficiency with 54% better watts-per-terabyte versus 8TB air drives.

What controller or backplane is needed to connect this SAS-12Gbps drive?

A 12Gbps SAS host bus adapter, RAID controller, or compatible backplane with SAS connectors is required for full-speed operation.

Will the HC520 work in a chassis built for earlier 3.5-inch enterprise drives?

Yes, it uses the standard 3.5-inch form factor and SAS interface, so it fits existing drive bays and caddies designed for previous-generation enterprise HDDs.

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