WD Red Plus 4TB SATA 6Gb/s 3.5" NAS Hard Disk Drive, Up to 180 TB/yr Workload Rate, 5400 RPM Class, 256MB Cache, 3D Active Balance Plus, NASware Firmware for Compatibility | WD40EFPX

The WD Red Plus 4TB (WD40EFZX / WD40EFPX) is designed for the power user who needs a reliable central hub for their digital life or business assets. Whether you are streaming high-definition media, backing up critical work files, or sharing large folders with team members, these drives provide the stability that standard desktop drives lack. Built to run cooler and quieter, the Red Plus series is rigorously tested for compatibility in always-on NAS environments.
 

Performance: CMR Technology and Enhanced Caching
Unlike consumer "SMR" drives that can struggle during the intensive write cycles of a RAID rebuild, the WD Red Plus uses CMR (Conventional Magnetic Recording). This ensures fast, predictable performance across the entire 4TB capacity. The WD40EFPX-68C6CN0 model features an upgraded 256MB cache (compared to the 128MB on the EFZX), providing even smoother data handling and faster file access for multi-user workloads.

Reliability: NASware 3.0 for System Integration
Western Digital’s exclusive NASware™ 3.0 technology is built into every Red Plus drive. This advanced firmware improves your system's storage performance by increasing compatibility, integration, and upgradeability. It specifically addresses the "error recovery" challenges of RAID environments, preventing the drive from being dropped from the array during a recovery cycle—a common issue with standard desktop hard drives.

Durability: 24/7 Multi-Bay Protection
NAS systems with multiple drives generate significant heat and vibration. The WD Red Plus 4TB is balanced and tested to mitigate these effects. Rated for a 180TB/year workload and a 1 million-hour MTBF, it provides the endurance required for small office servers and private clouds. Its energy-efficient design helps lower your electricity costs while keeping the temperature inside your NAS enclosure at an optimal level.
 

Why the WD Red Plus 4TB Stands Out
CMR Reliability: No performance "hiccups"—ideal for RAID and heavy write tasks.

Expanded Compatibility: Tested with a vast array of NAS enclosures (Synology, QNAP, etc.).

Cool & Quiet Operation: Optimized for low power consumption and minimal noise.

Streamlined RAID Rebuilds: Error recovery control minimizes drive fallout in arrays.