Western Digital WD120EFGX 12TB 7200 RPM 512MB CMR 3.5" SATA internal hard drive

Purpose-built NAS storage

The WD Red Plus WD120EFGX is a 12TB 3.5-inch internal hard drive built for multi-bay NAS enclosures. It uses conventional magnetic recording and a SATA 6.0Gb/s interface to deliver predictable throughput for RAID arrays. The 512MB cache helps sustain transfers during concurrent read and write streams. It targets small and medium business environments that run 24x7.

Thermals and power in normal use

The drive spins at 7200 RPM and fits the standard 3.5-inch form factor with a 26.10mm height. NASware firmware adjusts drive parameters to match typical NAS workloads, which helps limit unnecessary head movement and keeps operating temperatures steady. Power draw remains consistent with desktop-class SATA drives during idle and light access patterns. Acoustic output stays low enough for office or rack environments.

Behaviour under sustained load

The 180 TB per year workload rating reflects continuous operation across up to eight drive bays. CMR technology avoids the write-speed penalties of shingled recording during long sequential jobs such as backups or RAID rebuilds. The large cache absorbs bursty metadata traffic without stalling the platter. Firmware tuning prioritises data integrity over peak burst speed when the array is under heavy, prolonged demand.