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Silver 3.5-inch bare hard drive with HGST Ultrastar label

HGST

HGST Ultrastar DC HC520 12TB 7200 RPM SAS 3.5" internal hard drive

SKU CH-4JZY-2DFZX

Enterprise 12 TB SAS drive with 7200 RPM speed and 256 MB cache for 24/7 data-centre storage

  • Total capacity12 TB
  • Interface typeSAS 12Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Rotational speed7,200 RPM
  • Cache memory256 MB
  • 12 TB capacity for massive enterprise datasets
  • 7200 RPM spindle speed for rapid data access
  • 256 MB cache to accelerate read and write operations
  • SAS 12Gb/s interface for high-throughput server connectivity
  • Helium-sealed 3.5" design built for 24/7 data-centre operation

Enterprise capacity for data centres

The HGST Ultrastar DC HC520 is a 12TB 3.5-inch internal hard drive built for enterprise storage arrays. It spins at 7200 RPM with a 256MB cache and uses a SAS 12Gb/s interface. The helium-filled design supports continuous operation in high-density server environments.

Not for desktop or workstation builds

This drive is engineered exclusively for server chassis and external storage enclosures that provide SAS backplanes. It will not operate in a standard PC motherboard or consumer NAS unit. Buyers who need a drive for a home workstation, gaming rig or single-bay enclosure should look elsewhere.

SAS 12Gb/s interface determines compatibility

The drive connects only via a 12Gb/s SAS port and requires a compatible controller or backplane. No other interface is present on the unit. Verify that your storage system accepts 3.5-inch SAS drives before purchase.

How it compares

Measured against everything we stock in 3.5-Inch Internal Desktop HDDs, at today’s prices. Recalculated every night.

Price $383.99
Pricier than about 89% of the 4,938 comparable items (median $107.99).
Total capacity 12 TB
Higher than about 90% of the 2,372 comparable items (median 2 TB).
Price per TB $32.00 per TB
Cheaper than about 80% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameHGST
Product lineUltrastar DC HC520
Model nameHUH721212AL5200
Total capacity12 TB
Recommended useFor Enterprise Storage
Performance
Rotational speed7,200 RPM
Storage
Cache memory256 MB
Ports & slots
Interface typeSAS 12Gb/s
Size & build
Form factor3.5 in (8.89 cm)

Questions about this item

Should I choose the 12TB HC520 or a smaller HC520 model?

The HC520 series is offered in multiple capacities; the 12TB model provides the highest raw storage in a single 3.5" drive. Select it when you need maximum capacity per bay, otherwise choose a lower-capacity HC520 to match budget or redundancy plans.

What does the 7200 RPM rating mean once the drive is installed in a server?

7200 RPM is the spindle speed that determines baseline sequential throughput and average latency. In a server array it delivers consistent performance for mixed read/write workloads, supported by the 256MB cache and helium-sealed design.

What does the SAS 12Gb/s interface cap in practice?

The SAS 12Gb/s interface caps the host-link transfer rate at 12 gigabits per second. Actual sustained throughput will be lower and is limited by the 7200 RPM mechanics and 256MB cache.

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