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Silver 3.5-inch bare SATA hard drive with exposed circuit board

Western Digital

Western Digital 0F30146 Ultrastar DC HC520 12TB 7200 RPM SATA 3.5" internal hard drive

SKU CH-7ABJ-NBTA2 MPN 0F30146

12 TB enterprise hard drive rated for 550 TB yearly workload with 7200 RPM and 356 MB cache

  • PackagingBare Drive
  • InterfaceSATA 6.0Gb/s
  • Capacity12TB
  • RPM7200 RPM
  • Cache356MB
  • Average Latency6Gb/s

Options 12TB

  • 12TB capacity stores massive datasets in a single 3.5" drive
  • 7200 RPM spindle speed delivers consistent throughput for heavy workloads
  • 550TB annual workload rating handles enterprise-grade write cycles
  • HelioSeal helium platform reduces friction and power draw
  • Rotational Vibration Safeguard protects data integrity in multi-drive arrays

12 TB enterprise hard drive for storage arrays

The Western Digital Ultrastar DC HC520 is a 3.5 inch internal hard drive with a 12 TB capacity and a 7200 RPM spindle speed. It connects via a SATA 6.0 Gb/s interface and includes a 356 MB cache buffer. This drive is built for enterprise storage environments requiring high capacity and sustained operation.

Suited for high-workload servers.

The drive carries a workload rating up to 550 TB per year and a 2.5 million hour MTBF rating, targeting business storage systems and data centres. HelioSeal technology and Rotational Vibration Safeguard support multi-drive deployments. Buyers who need a low-cost desktop drive or a portable external disk should consider other product types.

550 TB annual workload rating defines endurance

The published workload rating of up to 550 TB per year is the primary specification that separates this enterprise drive from standard desktop models. It quantifies the amount of user data the drive is designed to transfer annually under continuous operation. Match this figure to your environment's write and read demands to confirm suitability.

Highlights

  • 12TB capacity stores massive datasets in a single 3.5" drive
  • 7200 RPM spindle speed delivers consistent throughput for heavy workloads
  • 550TB annual workload rating handles enterprise-grade write cycles
  • HelioSeal helium platform reduces friction and power draw
  • Rotational Vibration Safeguard protects data integrity in multi-drive arrays

Specifications

BrandWD
SeriesUltrastar DC HC520
Model0F30146
PackagingBare Drive
InterfaceSATA 6.0Gb/s
Capacity12TB
RPM7200 RPM
Cache356MB
Average Latency6Gb/s
FeaturesHigh Workload Rating
Delivering dependable performance to any storage environment, Ultrastar hard drives are designed with a workload rating up to 550TB per year, among the highest of any 3.5-inch hard drive.
Enterprise-class Storage to Rely On
Ultrastar is our top-end drive for data centers. 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.
HelioSeal Technology
Featured in over 30 million Western Digital hard drives shipped, HelioSeal technology allows
UsageFor Enterprise Storage
Form Factor3.5"
Height (maximum)26.10mm
Width (maximum)101.60mm
Length (maximum)147.00mm
Shipping weight0.64 kg
Package size199 × 127 × 50 mm

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Questions about this item

How do I install the 3.5" SATA drive in my server, and what step is often missed?

Mount the drive in a 3.5-inch bay using the 101.60mm width and 147.00mm length, connect SATA data and power cables, then enable the drive in the RAID controller or OS — the step often missed is configuring the controller to recognise the new LUN.

What maintenance or replacement will the Ultrastar DC HC520 need during its service life?

The drive has a 2.5M hour MTBF rating and a 550TB per year workload limit; plan replacement when SMART attributes indicate wear or when annualised writes approach the 550TB threshold.

What limit appears first when the 12TB drive runs sustained heavy writes?

The 550TB per year workload rating is the first constraint; exceeding it reduces the 2.5M hour MTBF expectation and can trigger early wear-out.

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