Western Digital 4 TB Red Plus 5400 rpm SATA III 3.5" Internal NAS Hard Disk Drive

Western DigitalSKU: WD40EFPX

Western Digital 4 TB Red Plus 5400 rpm SATA III 3.5" Internal NAS Hard Disk Drive

Western DigitalSKU: WD40EFPX

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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.

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

NASware 3.0 Technology WD's proprietary NASware 3.0 firmware fine-tunes drive parameters specifically for NAS workloads — improving compatibility with NAS enclosures, optimizing RAID rebuild efficiency, and enhancing overall system reliability during simultaneous multi-user access.	TLER — RAID Error Recovery Control Time-Limited Error Recovery caps the time the drive spends attempting to recover from a read error, ensuring the RAID controller is kept informed and the array stays healthy. This is the critical difference between NAS drives and desktop drives in RAID environments.
Efficient 5400 RPM Operation Runs at 5400 RPM for a balance of performance and power efficiency — delivering up to 180 MB/s sustained transfer rates. Quieter and cooler than 7200 RPM drives while still outpacing entry-level 5400 RPM NAS drives for multi-user access and media streaming workloads.	CMR Recording Technology Conventional Magnetic Recording delivers consistent, reliable write performance — critical for RAID rebuilds and write-intensive NAS workloads. Unlike SMR drives, CMR has no write performance penalties during random write operations or RAID array rebuilding.
256MB Cache A 256MB buffer improves performance during simultaneous read/write operations from multiple network users — reducing latency when several devices access the NAS concurrently for media streaming, file sharing, and backups.	180 TB/Year Workload Rating Rated for three times the annual workload of a typical desktop drive — covering the continuous read/write demands of always-on NAS systems handling multiple users, automated backups, media serving, and surveillance footage.
Rotational Vibration (RV) Sensors Built-in RV sensors detect and compensate for vibration from adjacent spinning drives in multi-bay NAS enclosures — maintaining read/write accuracy and performance in 4, 6, and 8-bay systems where multiple drives operate simultaneously.	1 Million Hours MTBF Mean Time Between Failures of 1 million hours reflects the drive's engineering for sustained, always-on operation — providing confidence in long-term reliability for NAS systems that run continuously without scheduled downtime.
Ideal for ZFS, RAID 0/1/5/6 and JBOD Optimized for all common NAS RAID configurations and ZFS file systems used by Synology, QNAP, and other major NAS brands. TLER and NASware 3.0 together ensure smooth RAID rebuild operations that are often the most demanding moment in a drive's life.	Broad NAS Compatibility Tested and validated with major NAS brands including Synology, QNAP, Asustor, and others. Western Digital maintains an active compatibility list updated with new NAS models — check wdc.com for your specific enclosure before purchase.
Dual-Plane Balance Control Reduces vibration and noise during operation — important in home and office environments where NAS systems run continuously near workspaces or living areas. Quieter operation without sacrificing performance.	3-Year Limited Warranty Backed by WD's 3-year limited warranty covering the drive against manufacturing defects during its rated service life in NAS environments.

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.

→ Authorized Canadian WD reseller	→ Genuine WD product with warranty
→ Fast shipping across Canada	→ Business invoicing available
→ Multiple capacities available	→ Bilingual customer support

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.

REFUND AND RETURN POLICY

Effective Date: November 12, 2025
Contact: support@itfactory.ca | (888) 313-1124

QUICK SUMMARY

Product Type	Return Window	Restocking Fee
Digital Software	Defective only	0%
Physical (Unopened)	30 days	0%
Physical (Opened)	30 days	15%
Defective/Wrong Item	30 days	0% - FREE return shipping
Open Box Items	7 days (DOA only)	0%
Final Sale Items	NO RETURNS	N/A

1. DIGITAL PRODUCTS (DOWNLOADABLE SOFTWARE)

Final Sale - Limited Exceptions

Software downloads are final sale once the activation key is sent.

No refunds for: Wrong purchase, changed mind, compatibility issues, or buyer's remorse.

Refunds ONLY if defective:

Activation key doesn't work after verification
Software crashes on systems meeting minimum requirements
Publisher confirms key is invalid or already used

Your Responsibility: Verify system requirements BEFORE purchasing. Once you receive the activation key, the sale is final unless the software is defective.

To request a refund: Email sales@itfactory.ca within 30 days with your order number and detailed description of the issue. We'll troubleshoot with you first.

2. PHYSICAL PRODUCTS

30-Day Returns

Return most physical products within 30 days of delivery.

Restocking Fees

Defective/Damaged/Wrong Item: 0% + FREE return shipping
Unopened (Changed Mind): 15%
Opened/Used (Changed Mind): 25%

Return Requirements

Items must have:

Original packaging and all accessories
Intact UPC code/barcode
No physical damage
RMA number (obtained before returning)

Cannot Be Returned

Final Sale items
Open Box items (except DOA within 7 days)
Items without original packaging
Items with removed UPC codes
Items used for mail-in rebates

3. HOW TO RETURN

Step 1: Get RMA Number

Email support@itfactory.ca with:

Order number
Item(s) to return
Reason for return
Photos (if defective/damaged)

We'll respond within 1-2 business days with your RMA number and instructions.

Step 2: Ship the Return

Write RMA number on outside of package
Include all original packaging and accessories
Use provided label (if applicable) or ship to:
ITFactory, 4035 St-Ambroise Unit 310, Montreal, QC H4C 2E1
Keep tracking number

Step 3: Receive Refund

Once we receive and inspect your return (3-5 business days), we'll process your refund. Refunds typically appear in 5-10 business days depending on your bank.

4. DEFECTIVE OR WRONG ITEMS

We'll provide a prepaid return label and offer a full refund, replacement, or store credit. No restocking fee.

5. EXCHANGES

We don't offer direct exchanges. Return the original item for a refund, then place a new order for the item you want.

6. CANCELLATIONS

Digital Products: Can cancel if activation key hasn't been sent yet
Physical Products: Can cancel if order hasn't shipped yet
Contact us immediately at support@itfactory.ca or (888) 313-1124

7. SPECIAL CIRCUMSTANCES

Order Verification

We may verify orders before processing. If we contact you, please respond within 3 business days or your order will be automatically cancelled and refunded.

Pricing Errors

We reserve the right to cancel orders placed at incorrect prices due to errors. You'll receive a full refund.

Out of Stock

If an item becomes unavailable after ordering, we'll notify you and offer to wait for restock or receive a full refund.

8. MANUFACTURER WARRANTIES

Many products include manufacturer warranties separate from our 30-day return policy. Warranty claims after 30 days should be directed to the manufacturer. We can help facilitate warranty claims when possible.

CONTACT US

Returns & Refunds Department
Email: support@itfactory.ca (fastest response)
Phone: (888) 313-1124
Hours: Monday-Friday, 9:30 AM - 5:30 PM EST

Important: The policy in effect at the time of your purchase applies to your order. We recommend reviewing this policy before each purchase.

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