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Silver 3.5 inch enterprise hard drive with SAS connector

HGST

HGST DC HC520 12TB SAS 12Gbps 7.2K 256MB 3.5" internal hard drive

SKU CH-G68C-DB4FX

Enterprise 12 TB helium-filled drive with 12 Gb/s SAS interface, 7 200 RPM and 256 MB cache for 24/7 data-centre workloads

  • Capacity12TB
  • RPM7200 RPM
  • InterfaceSAS 12Gb/s
  • Average Seek Time4.6ms
  • Form Factor3.5"
  • 12TB capacity for high-density storage
  • 12Gb/s SAS interface for fast data transfer
  • 7200 RPM spindle speed for responsive performance
  • 256MB cache to accelerate read and write operations
  • Helium-filled HelioSeal design for lower power draw and vibration

12TB SAS enterprise drive

The HGST Ultrastar DC HC520 is a 12TB internal hard drive built for high-density data centres and cloud storage platforms that run 24 hours a day. Its helium-filled HelioSeal design reduces internal friction, lowering power draw and vibration compared with conventional air-filled units. The 3.5-inch form factor fits standard enterprise drive bays.

SAS 12Gbps interface and 256MB cache

A 12Gb/s SAS connection delivers the sustained throughput required by multi-drive arrays and tiered storage pools. The 256MB buffer absorbs burst write traffic and smooths read latency during heavy concurrent workloads. Rotational speed of 7200 RPM and a 4.6ms average seek time keep random I/O responsive for database and virtualisation tasks.

Verify SAS controller and bay compatibility

Confirm that your host bus adapter or RAID controller supports 12Gb/s SAS signalling and the drive's command set. Ensure the chassis provides 3.5-inch hot-swap or fixed bays with adequate airflow for helium-sealed units. Check that your operating system or hypervisor includes drivers for enterprise SAS drives before deployment.

Põhijooned

  • 12TB capacity for high-density storage
  • 12Gb/s SAS interface for fast data transfer
  • 7200 RPM spindle speed for responsive performance
  • 256MB cache to accelerate read and write operations
  • Helium-filled HelioSeal design for lower power draw and vibration

Tehnilised andmed

BrandWestern Digital
Part NumberHUH721212AL4200
Capacity12TB
RPM7200 RPM
InterfaceSAS 12Gb/s
Average Seek Time4.6ms
Form Factor3.5"

Küsimused selle toote kohta

Does the helium-filled HelioSeal enclosure need refilling or servicing during its lifespan?

The sealed helium design requires no refilling or routine maintenance; the drive is built to operate continuously without user service.

What limits sustained write throughput on the SAS 12Gb/s interface?

The 7200 RPM spindle and 4.6 ms average seek time set the practical ceiling for sequential and random write performance.

How much heat and power does the 12 TB helium drive generate in 24/7 operation?

HelioSeal technology reduces power draw and vibration, so the drive runs cooler and quieter than air-filled equivalents during all-day use.

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