Amazon Renewed

WD Red 4TB NAS Internal Hard Drive - 5400 RPM Class, SATA 6 Gb/s, SMR, 256MB Cache, 3.5" - WD40EFAX (Renewed)

Name: WD Red 4TB NAS Internal Hard Drive - 5400 RPM Class, SATA 6 Gb/s, SMR, 256MB Cache, 3.5" - WD40EFAX (Renewed)
Brand: Amazon Renewed
SKU: B089Q7J25S

Status: WD Red 4TB NAS Internal Hard Drive - 5400 RPM… (4TB hard drive): Unavailable on Amazon as of 2026-10-05 04:26 UTC. Closest in-stock match (same 4TB hard drive): Seagate IronWolf 4TB NAS Internal Hard Drive CMR…, $189.99 on Amazon as of 2026-10-08 04:20 UTC (price may vary). eBay sellers may still list this model new or used.

View Current Price — $189.99 🛒 Search eBay for this model

Bottom line: The Amazon Renewed WD Red 4TB NAS Internal Hard Drive is a specs-and-price decision rather than a crowd-consensus one in the external storage category. Check the specification table below against one or two close alternatives — on price and spec fit, not on star ratings.

Unavailable on Amazon as of 2026-10-05 04:26 UTC

As an Amazon Associate, SpecPicks earns from qualifying purchases. Full disclosure →

Currently unavailable on Amazon. Not the same product — 3 in-stock alternatives with matching specs:

Same 4TB hard drive: Seagate IronWolf 4TB NAS Internal Hard Drive CMR… — $189.99 on Amazon as of 2026-10-08 04:20 UTC (price may vary).

View Current Price — $189.99

Same 4TB hard drive: HGST Ultrastar 7K6000 HUS726040ALE610 — $149.99 on Amazon as of 2026-10-07 16:20 UTC (price may vary).

View Current Price — $149.99

Same 4TB hard drive: Hitachi 2022 HGST WD Ultrastar HUS726T4TALE6L4… — $159.99 on Amazon as of 2026-10-07 22:19 UTC (price may vary).

View Current Price — $159.99

Original listing (currently unavailable) → Compare to similar external storage

By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-05

Mike Perry — Hardware researcher since 2014. For external drives and portable storage, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference. About the author →

Pros & Cons

Pros

✓ Specifically designed for use in NAS systems with up to 8 bays
✓ Backed by Amazon Renewed's warranty and support channels

Cons

✗ Check the listed dimensions, connectors and platform compatibility against your setup before ordering
✗ Price, stock, shipping and returns are set by the retailer and may have changed since this page was last updated

Manufacturer description

This pre-owned or refurbished product has been professionally inspected and tested to work and look like new. How a product becomes part of Amazon Renewed, your destination for pre-owned, refurbished products: A customer buys a new product and returns it or trades it in for a newer or different model. That product is inspected and tested to work and look like new by Amazon-qualified suppliers. Then, the product is sold as an Amazon Renewed product on Amazon. If not satisfied with the purchase, renewed products are eligible for replacement or refund under the Amazon Renewed Guarantee.

SpecPicks Verdict

SpecPicks scored Amazon Renewed WD Red 4TB NAS Internal Hard Drive using a rating × review-volume × price-fit model applied to published specs and reviews across the external storage category. Amazon Renewed's external storage lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

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 retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key Features

Specifically designed for use in NAS systems with up to 8 bays
Supports up to 180 TB/yr workload rate Rate is defined as amount of user data transferred to or from drive. Workload Rate is annualized (TB transferred times (8760/recorded power-on hrs)). Workload Rate will vary on hardware/software components
NASware firmware for compatibility
Small and home office NAS systems in a 24/7 environment
3-year manufacturer's limited

Full Specifications

Brand	Western Digital
Color	Red
Model Name	WD40EFAX
Unit Count	1 Count
Form Factor	3.5-inch
Model Number	WD40EFAX-cr
Built-In Media	Hard Drive
Hard-Drive Size	4 TB
Mfr Part Number	WD40EFAX-cr
Number of Items	1
Special Feature	Portable
Hardware Platform	Mac, PC
Installation Type	Internal Hard Drive
Compatible Devices	Desktop
Data Transfer Rate	180 megabits_per_second
Enclosure Material	Aluminum
Additional Features	Portable
Hard Disk Interface	Serial ATA-600
Warranty Description	90 days limited warranty
Hard Disk Description	Mechanical Hard Disk

Ready to buy?

Amazon shows no buyable offer for WD Red 4TB NAS Internal Hard Drive - 5400 RPM… at the last check. The closest in-stock match with the same 4TB hard drive is Seagate IronWolf 4TB NAS Internal Hard Drive CMR…. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

View Current Price — $189.99