Western Digital WD40EZZX 4TB 5400 RPM 128MB CMR 3.5" SATA internal hard drive

Capacity and intended use

The WD Blue WD40EZZX is a 4TB desktop hard drive built for everyday computing tasks. It suits users who need large, affordable storage for documents, media libraries and backups. The 5400 RPM spindle and 128MB cache deliver steady throughput for typical workloads. It is not aimed at high-performance gaming or professional video editing that demand faster sustained rates.

Sustained workload behaviour

The drive uses CMR recording technology to maintain consistent write performance across the full 4TB capacity. Its SATA 6.0Gb/s interface handles sequential transfers without the slowdowns seen in shingled designs. The 5400 RPM speed keeps latency predictable during long copy or backup sessions. Heavy random I/O workloads such as database servers will find the mechanical limits restrictive.

Thermals, noise and power

Low power consumption and advanced power management reduce heat output during normal desktop use. The 3.5 inch form factor fits standard drive bays with maximum dimensions of 26.10mm height, 101.60mm width and 147.00mm length. Acoustic levels remain low enough for quiet office or home environments. The drive draws modest current from the 12V and 5V rails without requiring extra cooling.