Western Digital WD181KFGXProduct Red Pro 18TB 7200 RPM 3.5" SATA internal hard drive

18 TB Red Pro NAS Drive

The Western Digital Red Pro WD181KFGX is an 18 TB 3.5-inch internal hard drive built for network-attached storage. It spins at 7200 RPM over a SATA 6.0 Gb/s interface and uses conventional magnetic recording with a 512 MB cache. A helium-sealed design and rotational vibration sensors support reliable operation in multi-bay enclosures.

Suited for 24-bay NAS workloads

This drive targets power users and medium-sized businesses running 24x7 NAS systems with up to 24 bays. It handles high-intensity workloads such as archiving, file sharing and backup for many concurrent users. Buyers who need a smaller capacity or a lower-RPM drive for lighter desktop use should consider other models.

CMR recording with helium sealing

The single specification that decides fit is the conventional magnetic recording method combined with a helium-sealed chassis. CMR delivers consistent write performance without the latency penalties of shingled recording, while the helium fill reduces turbulence and power draw at 7200 RPM. This combination makes the drive appropriate for heavy, always-on NAS arrays.