Western Digital

Western Digital 4TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 128 MB Cache, 3.5" - WD40EFZZ

Name: Western Digital 4TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 128 MB Cache, 3.5" - WD40EFZZ
Brand: Western Digital
SKU: B0G5YDXKS7
Price: 194.99 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 →

$194.99

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View Current Price on Amazon → Compare to similar external storage

*Price sourced from Amazon.com. Last updated 2026-08-15. 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, 128 MB Cache, 3.5" - WD40EFZZ is a niche pick — read recent reviews before buying in the external storage category, priced around $194.99. Compare close alternatives before committing.

The Western Digital 4TB WD Red Plus (WD40EFZZ) is a 3.5-inch NAS hard drive built for always-on network storage rather than occasional desktop duty. It spins at 5400 RPM over a SATA 6 Gb/s interface and records with CMR, not SMR, so rewrites land sequentially instead of overlapping - the recording method that keeps RAID rebuilds and array resilvers predictable. A 128 MB cache buffers the small, random writes a multi-user NAS generates throughout the day. Western Digital rates this drive for continuous operation and tunes its firmware with NASware, which handles the error recovery and…

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 external storage category. Western Digital's external storage 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 external storage 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 2TB to 12TB
✓ 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 2TB to 12TB
For RAID-optimized NAS systems with up to 8 bays
Designed for Continuous Operation
Backed by World-Class Support and Warranty
Tuned for NAS with NASware

Full Specifications

Brand	Western Digital
Color	Red
Model Name	WD Red
Read Speed	180 megabytes_per_second
Form Factor	3.5-inch
Media Speed	180
Model Number	WD40EFZZ-SPCPAN0
Built-In Media	hard drive
Hard-Drive Size	4 TB
Mfr Part Number	WD40EFZZ
Number of Items	1
Special Feature	3-year limited warranty, NASware, Rotation Vibration (RV) sensors
Hardware Platform	WD
Installation Type	Internal Hard Drive
Compatible Devices	Desktop
Data Transfer Rate	180 megabits_per_second
Enclosure Material	Information Not Available
Additional Features	3-year limited warranty, NASware, Rotation Vibration (RV) sensors
Hard Disk Interface	Serial ATA-600
Warranty Description	3 year limited warranty

Ready to buy?

Western Digital 4TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 128 MB Cache, 3.5" - WD40EFZZ 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 2026-08-15. Price and availability subject to change.