Western Digital

Western Digital 4TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 64 MB Cache, 3.5" - WD40EFRX

Name: Western Digital 4TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 64 MB Cache, 3.5" - WD40EFRX
Brand: Western Digital
SKU: B00EHBERSE
Price: 285.00 USD
Availability: InStock

By Mike Perry, Hardware Editor · Verified 2026-09-06

Mike Perry has researched PC hardware since 2014, tracking 80+ GPU generations, 50+ retro handheld platforms, and 30+ vintage PC configurations. He synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides. View full credentials →

$285.00

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View Current Price on Amazon → Compare to similar nas & home servers

*Price sourced from Amazon.com. Last updated 2026-08-17. Price and availability subject to change.

Bottom line: The Western Digital 4TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 64 MB Cache, 3.5" - WD40EFRX is a niche pick — read recent reviews before buying in the nas & home servers category, priced around $285.00. Compare close alternatives before committing.

The WD Red Plus WD40EFRX gives you 4TB of CMR storage built specifically for always-on NAS duty, not repurposed desktop use. Western Digital rates this drive for 24x7 operation in small and medium business enclosures, with support for bays counts up to eight and a workload rating of up to 180TB per year. That workload figure matters if you run ZFS scrubs, parity rebuilds, or nightly backup jobs, because consumer desktop drives are typically rated far lower. The 5400RPM performance class keeps heat and acoustics down in a multi-bay chassis, while 64MB of cache and a SATA 6Gb/s interface…

SpecPicks Verdict

SpecPicks scored Western Digital 4TB WD Red Plus NAS Internal Hard Drive HDD - 5400… using a rating × review-volume × price-fit model applied to our editorial and benchmark analysis across the nas & home servers category. Western Digital's nas & home servers lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Mixed or limited buyer feedback at this price point — focus your evaluation on recent reviews that specifically address build quality and long-term reliability, and shortlist one or two close alternatives before deciding.

Common buyer scenarios for nas & home servers of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.

Pros & Cons

Pros

✓ Available in capacities ranging from 1-14TB with support for up to 8 bays
✓ Backed by Western Digital's warranty and support channels
✓ Ships via Amazon with Prime eligibility and the standard returns policy

Cons

✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified

Key Features

Available in capacities ranging from 1-14TB with support for up to 8 bays
5400RPM performance class
Supports up to 180 TB/yr workload rate*| * Workload Rate is defined as the amount of user data transferred to or from the hard drive. Workload Rate is annualized (TB transferred ✕ (8760 / recorded power-on hours))
NASware firmware for compatibility
Small or medium business NAS systems in a 24x7 environment
3-year limited warranty

Full Specifications

Brand	Western Digital
Color	Red
Model Name	WD40EFRX
Unit Count	1 Count
Form Factor	3.5-inch
Media Speed	5200 rpm
Model Number	WD40EFRX
Built-In Media	Hard Drive
Hard-Drive Size	4 TB
Mfr Part Number	WD40EFRX
Number of Items	1
Special Feature	Western Digital 4TB SATA
Item Part Number	WD40EFRX
Hardware Platform	PC; Mac
Installation Type	Internal Hard Drive
Compatible Devices	NAS systems
Data Transfer Rate	600 megabits_per_second
Enclosure Material	Aluminum
Additional Features	Western Digital 4TB SATA
Hard Disk Interface	Serial ATA-600

Ready to buy?

Western Digital 4TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 64 MB Cache, 3.5" - WD40EFRX is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

View Current Price on Amazon →

*Price sourced from Amazon.com. Last updated 2026-08-17. Price and availability subject to change.