Western Digital 4 TB Red Plus 5400 rpm SATA III 3.5" Internal NAS Hard Disk Drive
Western Digital 4 TB Red Plus 5400 rpm SATA III 3.5" Internal NAS Hard Disk Drive
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Description
NAS Hard Drive 5400 RPM — CMR Up to 8-Bay RAID Systems
Purpose-built for always-on NAS environments — 4TB, 5400 RPM, 256MB cache, CMR recording, and NASware 3.0 technology for reliable 24/7 operation in RAID-optimized storage systems.
The WD Red Plus (WD40EFPX) is a 3.5-inch SATA NAS hard drive engineered for the continuous read/write demands of home and small-to-medium business NAS systems. Where desktop drives fail under always-on shared storage workloads, the WD Red Plus is designed from the ground up for exactly this environment — running 24/7 in RAID-powered enclosures, handling simultaneous access from multiple users, and surviving the vibration and thermal conditions of multi-drive NAS bays. At 4TB with 5400 RPM speed, a 256MB cache, and CMR recording technology, it is one of the most capable drives in the mainstream NAS category.
Available at ITFactory.ca — Canada's trusted source for NAS storage and network components.
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Why NAS Drives Are Not Interchangeable with Desktop Drives Desktop hard drives are engineered for single-user, intermittent workloads — they are not designed to run continuously in a RAID array, handle simultaneous network requests from multiple users, or tolerate the vibration generated by neighbouring drives in a multi-bay enclosure. When a desktop drive encounters a read error in a RAID environment, it may spend too long attempting recovery — causing the RAID controller to drop the drive from the array, resulting in data loss. The WD Red Plus addresses all of this: TLER (Time-Limited Error Recovery) caps the error recovery window so the RAID controller stays informed, NASware 3.0 optimizes firmware parameters for NAS workloads, and the drive is stress-tested for 24/7 operation in up to 8-bay enclosures. Using a desktop drive in a NAS is a false economy that typically ends in premature failure or RAID degradation. |
Key Features
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NASware 3.0 Technology |
TLER — RAID Error Recovery Control |
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Efficient 5400 RPM Operation |
CMR Recording Technology |
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256MB Cache |
180 TB/Year Workload Rating |
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Rotational Vibration (RV) Sensors |
1 Million Hours MTBF |
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Ideal for ZFS, RAID 0/1/5/6 and JBOD |
Broad NAS Compatibility |
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Dual-Plane Balance Control |
3-Year Limited Warranty |
Who Is This For?
The WD Red Plus 4TB is the right drive for home users and small offices building or expanding a NAS for file sharing, media streaming, and backup storage. At 5400 RPM it runs quietly and efficiently — ideal for home environments where low noise and low power consumption matter as much as reliability.
Home and SOHO NAS builds Small to mid-size business file servers 4K media streaming and Plex servers Synology and QNAP enclosures Backup and archive storage systems RAID 0, 1, 5, 6, and ZFS arrays
Technical Specifications
| Brand | Western Digital (WD) |
| Model | WD Red Plus NAS Hard Drive |
| Part Number | WD40EFPX |
| Drive Type | HDD (Hard Disk Drive) — 3.5 inch |
| Capacity | 4TB |
| Interface | SATA III (6 Gb/s) |
| Rotation Speed | 5400 RPM |
| Cache | 256 MB |
| Max Sequential Transfer | Up to 180 MB/s |
| Recording Technology | CMR (Conventional Magnetic Recording) |
| Workload Rating | 180 TB/year |
| NAS Bay Support | Up to 8 bays |
| RAID Support | RAID 0, 1, 5, 6, JBOD, ZFS |
| Error Recovery | TLER (Time-Limited Error Recovery) |
| NAS Firmware | NASware 3.0 |
| RV Sensors | Yes — rotational vibration compensation |
| MTBF | 1,000,000 hours |
| Load/Unload Cycles | 600,000 |
| Non-Recoverable Read Errors | <1 in 10¹⁴ bits read |
| Operating Temperature | 0°C to 65°C |
| Compatibility | Synology, QNAP, Asustor, and major NAS brands |
| Warranty | 3-year limited warranty |
| Sold by | ITFactory.ca — Canadian authorized WD reseller |
Why Buy from ITFactory.ca?ITFactory.ca is a trusted Canadian retailer for NAS storage and network components, serving home users, IT professionals, and businesses across the country. Every product we sell is genuine and backed by our team.
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Frequently Asked Questions
What is the difference between WD Red, WD Red Plus, and WD Red Pro?
WD Red is the entry-level NAS drive — 5400 RPM, smaller cache, SMR recording on some capacities, and rated for up to 8-bay systems. WD Red Plus (this drive) is the mainstream choice — 5400 RPM, CMR recording on all capacities, 256MB cache, and rated for up to 8-bay systems with a 180 TB/year workload. WD Red Pro steps up for larger deployments — rated for up to 24-bay systems, a 550 TB/year workload, and a 5-year warranty. For most home and small business NAS builds with up to 8 bays, the WD Red Plus hits the right balance of performance and value.
Why does it matter that this uses CMR and not SMR?
SMR (Shingled Magnetic Recording) writes new tracks overlapping old ones — which improves density but causes significant write speed penalties during random writes and RAID rebuilds, as the drive must read, modify, and rewrite overlapping track bands. This can dramatically extend RAID rebuild times and cause poor NAS performance under mixed workloads. CMR (Conventional Magnetic Recording) has no such limitation — writes are direct and consistent. For NAS use, especially in RAID configurations, CMR is the reliable choice. The WD Red Plus uses CMR on all capacities.
What is TLER and why does it matter for RAID?
TLER (Time-Limited Error Recovery) limits how long the drive spends attempting to recover from a read error before reporting the problem back to the RAID controller. Desktop drives have no TLER — they may spend minutes attempting recovery on their own, during which the RAID controller assumes the drive has failed and may drop it from the array. WD Red Plus drives cap error recovery within a defined window, keeping the RAID controller informed and preventing unnecessary array degradation from a recoverable error.
Is the WD Red Plus compatible with my Synology or QNAP NAS?
WD Red Plus drives are tested and validated with major NAS brands including Synology, QNAP, and Asustor. Before purchasing, it is always advisable to verify compatibility with your specific NAS model using the manufacturer's online compatibility list — Synology's compatibility database and QNAP's compatibility list are both searchable by drive model number. The WD40EFPX is widely supported across current Synology DS, RS, and DX series enclosures and QNAP TS series enclosures.
My NAS has more than 8 bays — can I still use this drive?
The WD Red Plus is rated and validated for NAS systems with up to 8 drive bays. In enclosures with more bays, WD recommends the WD Red Pro — rated for up to 24-bay systems with a 550 TB/year workload and a 5-year warranty. Using a WD Red Plus in a larger enclosure may work in practice but falls outside the drive's validated specification and could affect warranty coverage. WD Red Pro drives are also available at ITFactory.ca.
Can I use this drive in a desktop PC or external enclosure?
Yes — the WD Red Plus uses a standard SATA III interface and will work in a desktop PC or external USB enclosure. However, it is optimized for NAS and RAID workloads. For a desktop PC primary drive, WD Blue or WD Black drives are better suited. For a standalone external drive, the WD Red Plus will function correctly but its NAS-specific features (TLER, NASware 3.0) are only meaningful in a NAS or RAID context.
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