Western Digital Ultrastar DC HC520 12TB SAS 12Gb/s 7200RPM 3.5" Enterprise HDD

12 TB helium enterprise drive

The Western Digital Ultrastar DC HC520 is a 12 TB 3.5 inch hard drive built for 24x7 server workloads. A helium-welded enclosure reduces internal turbulence and helps sustain performance. It connects through a SAS 12 Gb/s interface and spins at 7200 RPM. The 512e sector format ensures compatibility with modern disk controllers.

Suited for RAID arrays and bulk storage

This drive targets administrators who need high-capacity, helium-sealed storage for continuous operation in enterprise arrays. It is not appropriate for systems that lack a SAS controller or for portable enclosures that require a smaller form factor. Workstations limited to consumer interfaces should consider other options.

SAS 12 Gb/s interface requirement

The single specification that decides fitment is the SAS 12 Gb/s connection; the drive will only function when the host provides a compatible SAS controller and backplane. Without that interface the unit cannot communicate with the system. Verify controller support before purchase.