WD Red Plus 4TB x4 Bundle – 16TB 3.5" SATA NAS HDD Kit, NASware 3.0, CMR, RAID Ready
Build a high-capacity, RAID-protected NAS array with this WD Red Plus 4TB x4 bundle (WD40EFZZ). Each drive is purpose-built for NAS environments with NASware 3.0 firmware, CMR recording technology, and 24/7 operation capability. Together, these four drives deliver 16TB of raw storage, ready for RAID 5, RAID 6, or RAID 10 configurations in small to medium business or prosumer NAS systems.
What's in This Bundle
Four identical WD Red Plus 4TB drives (WD40EFZZ) supplied as a matched set. Ideal for populating a 4-bay NAS enclosure or expanding an existing system.
WD Red Plus 4TB (WD40EFZZ) — Bundle of 4 drives, 16TB total raw storage
RAID Configuration Guide — 4 × 4TB Drives
This four-drive bundle gives you maximum flexibility when configuring your NAS. Moreover, because all four drives are identical matched WD40EFZZ units, RAID rebuild times and performance remain consistent and predictable. Choose the configuration that best fits your balance of capacity, redundancy, and performance.
| RAID Level | Usable Capacity | Fault Tolerance | Best For |
|---|---|---|---|
| RAID 5 | ~12TB | 1 drive failure | Best capacity-to-protection balance for SMB |
| RAID 6 | ~8TB | 2 drive failures | Maximum redundancy for critical business data |
| RAID 10 | ~8TB | 1 per mirrored pair | Highest performance with strong redundancy |
| JBOD | 16TB | None | Maximum raw capacity, media or archive storage |
Why the WD Red Plus is the Right Drive for Every Bay
Filling all four bays with purpose-built NAS drives — rather than desktop alternatives — makes a significant difference to long-term reliability, performance, and compatibility. Furthermore, using matched drives from the same model range simplifies RAID management and ensures consistent behaviour across the entire array.
Each drive in this bundle includes Western Digital's exclusive NASware 3.0 firmware, which fine-tunes drive parameters specifically for NAS workloads. In multi-drive environments, NASware 3.0 improves RAID error recovery control through tuned TLER settings. Additionally, it enhances compatibility across a wide range of NAS enclosures from Synology, QNAP, Asustor, and TerraMaster. Therefore, each drive actively contributes to a more stable and reliable array rather than simply operating as a generic storage device.
All four drives use Conventional Magnetic Recording (CMR), which is the correct technology for RAID arrays. Unlike SMR (Shingled Magnetic Recording) drives, CMR delivers consistent write performance under sustained workloads without write penalty or cache management issues. Consequently, RAID rebuilds complete faster and more predictably. This is particularly important when a drive replacement triggers a full array reconstruction — a process that can take many hours and places significant stress on all remaining drives.
When four drives operate together in adjacent bays, vibration is a real and measurable threat to performance and longevity. Each WD Red Plus drive includes built-in Rotational Vibration (RV) sensors that actively detect and counteract vibration caused by neighbouring drives. Furthermore, the enhanced dual-plane balance control technology reduces rotational imbalance, minimising noise and vibration transmission through the NAS chassis. This active vibration management ensures the entire bundle maintains stable performance throughout its operational life.
Running four hard drives continuously demands careful attention to power and heat. The WD Red Plus is engineered for lower power consumption than previous drive generations, which directly reduces running costs and lowers the thermal load inside your NAS enclosure. This is especially important in thermally challenged enclosures where heat buildup can accelerate drive wear. Moreover, the 5400 RPM rotational speed further reduces heat output compared to 7200 RPM alternatives, keeping your entire array cooler over time.
Why Buy a Matched Bundle Rather Than Individual Drives
Purchasing four identical drives together ensures consistency across your entire NAS array. This matters more than most users realise when it comes to real-world performance and reliability.
Matched CMR Technology
All four drives use identical CMR recording, ensuring consistent RAID rebuild behaviour and eliminating mixed-technology compatibility issues.
Identical Firmware
Same NASware 3.0 firmware across all drives means uniform TLER settings and predictable error recovery in every bay.
Same Production Age
Matched drives from the same batch age at the same rate, giving you advance warning before multiple drives approach end-of-life simultaneously.
3-Year Warranty Each
Every drive in the bundle carries its own individual 3-year Western Digital limited warranty for full coverage across your entire array.
Technical Specifications — Per Drive (WD40EFZZ)
| Feature | Specification (Per Drive) |
|---|---|
| Bundle Contents | 4 × WD Red Plus 4TB (WD40EFZZ) |
| Total Raw Capacity | 16TB (4 × 4TB) |
| Model Number | WD40EFZZ |
| Capacity Per Drive | 4TB |
| Form Factor | 3.5-Inch |
| Interface / Connector | SATA 6 Gb/s |
| Max Transfer Rate | Up to 180 MB/s |
| Rotational Speed | 5400 RPM |
| Recording Technology | CMR (Conventional Magnetic Recording) |
| Cache / Buffer Size | 128 MB |
| RAID NAS Compatibility | Up to 8-bay NAS systems |
| Workload Rating (TBW) | 180 TB/Year per drive |
| MTBF | 1,000,000 Hours per drive |
| Operating Temperature | 0°C to 65°C |
| Non-Operating Temperature | -40°C to 70°C |
| Dimensions (L × W × H) | 146.99 mm × 101.6 mm × 26.11 mm |
| Weight Per Drive | 0.55 kg |
| Certifications | CE, FCC, UL, TUV, CB-Scheme, RCM, UKCA, VCCI, KC, ICES-003, BSMI, Maghreb |
| Warranty | 3-Year Limited Warranty per drive |
Ideal Use Cases for This 4-Drive Bundle
4-Bay NAS Full Population
This bundle is the perfect choice for fully populating a 4-bay NAS enclosure from Synology, QNAP, Asustor, or TerraMaster. All four bays are filled with matched, purpose-built NAS drives in a single order, simplifying setup and ensuring compatibility from day one.
RAID 5 SMB File Server (12TB Usable)
Configure as RAID 5 to achieve approximately 12TB of usable storage with single-drive fault tolerance. This is ideal for small to medium businesses needing a reliable, cost-effective file server for document management, shared storage, and team collaboration workflows.
RAID 6 Critical Data Protection (8TB Usable)
For environments where data loss is unacceptable, RAID 6 provides dual-drive fault tolerance. With 8TB of usable space, this configuration suits businesses storing financial records, client data, or any information where maximum redundancy justifies the capacity overhead.
Home Media Server and Personal Cloud
A four-drive WD Red Plus array provides an outstanding foundation for a personal cloud, Plex media server, or home backup solution. The 16TB raw capacity accommodates extensive video libraries, photo archives, and multi-device backups with room to grow over many years.
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