Western Digital 0F38459 Ultrastar DC HC550 18TB 3.5" 7200 RPM 512MB cache SATA internal hard drive

High-capacity enterprise hard drive

The Western Digital Ultrastar DC HC550 0F38459 is an 18TB 3.5-inch internal hard drive built for enterprise storage systems. It spins at 7200 RPM with a 512MB cache and connects via SATA 6.0Gb/s. The drive uses CMR recording technology and incorporates Energy-Assisted Magnetic Recording with a Triple Stage Actuator for reliable high-density performance.

Suited for bulk storage arrays.

This drive suits administrators deploying large-capacity RAID arrays, backup repositories or nearline storage where sequential throughput and cost per terabyte matter. The HelioSeal design delivers power efficiency for dense deployments. Buyers needing low-latency random access for transactional databases or virtualisation hosts should look at solid-state alternatives instead.

SATA 6.0Gb/s interface determines host compatibility

The single specification that decides fitment is the SATA 6.0Gb/s interface; the system backplane or controller must support this standard. The bare-drive packaging means no mounting brackets or cables are included, so installation hardware must be sourced separately. A projected 2.5M hour MTBF rating reflects the drive's enterprise-grade design targets.