---
product_id: 195809213
title: "WD Red 4TB 3.5 Inch NAS Internal Hard Drive - 5400 RPM - WD40EFAX"
brand: "western digital"
price: "$452.35"
currency: USD
in_stock: true
reviews_count: 13
category: "Western Digital"
url: https://www.desertcart.us/products/195809213-wd-red-4tb-3-5-inch-nas-internal-hard-drive
store_origin: US
region: United States of America
---

# 4TB capacity 180TB/year workload rating 5400 RPM optimized for NAS WD Red 4TB 3.5 Inch NAS Internal Hard Drive - 5400 RPM - WD40EFAX

**Brand:** western digital
**Price:** $452.35
**Availability:** ✅ In Stock

## Summary

> 💼 Elevate your NAS game with WD Red — storage that works as hard as you do!

## Quick Answers

- **What is this?** WD Red 4TB 3.5 Inch NAS Internal Hard Drive - 5400 RPM - WD40EFAX by western digital
- **How much does it cost?** $452.35 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/195809213-wd-red-4tb-3-5-inch-nas-internal-hard-drive)

## Best For

- western digital enthusiasts

## Why This Product

- Trusted western digital brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Seamless Compatibility:** WD NASware firmware ensures smooth integration and enhanced data protection across your NAS environment.
- • **Cool & Quiet Performance:** Runs cooler and quieter than typical desktop drives, reducing noise and heat in always-on NAS systems.
- • **Designed for NAS Mastery:** Engineered specifically for up to 8-bay NAS systems to keep your data flowing 24/7 without a hitch.
- • **Endurance That Works Overtime:** Supports a hefty 180TB annual workload, perfect for relentless data demands in professional and home office setups.
- • **Trusted Reliability & Warranty:** Backed by a 3-year limited warranty and proven durability, so you can confidently scale your storage.

## Overview

The WD Red 4TB NAS Internal Hard Drive (WD40EFAX) is a 3.5-inch mechanical HDD spinning at 5400 RPM, designed specifically for NAS systems with up to 8 bays. It supports an impressive 180TB/year workload rate, ensuring reliable 24/7 operation with WD NASware firmware for seamless compatibility and data protection. Ideal for small to medium office and home NAS setups, it offers cooler, quieter performance and comes with a 3-year limited warranty.

## Description

Reliable 24/7 NAS storage with 4TB WD Red drive. Supports up to 180TB/year workload and WD NASware firmware for seamless compatibility and data protection.

Review: Good replacement drives in our home ZyXEL NAS - The two 1TB Seagate drives in our ZyXEL NAS326A were beginning to throw a few "Spin_Retry_Count" errors and were getting a bit noisy and hot. This is often a sign that the bearings are starting to go. As I also wanted to increase capacity, I opted for 2 of these WD NAS Red drives (2TB) - to run in a similar Raid-1 configuration. They arrived next day, factory sealed and well packaged direct from desertcart. Their manufacture date was November 2019 and the SMART information on each drive confirmed zero power on hours and zero accumulated errors. So I was able to swap one drive at a time with a rebuild in between. It took a few hours but everything seems fine. These new drives run a few degrees cooler than the older Seagate discs they replaced. They are also much quieter (though not silent). Transfer times are a marginal improvement - though that has never been an issue for us. After a week, we still have zero errors so I am satisfied everything is as it should be. Automatic backups to an external drive are also running smoothly. I was also able to register both drives on the WD website and received confirmation of the ~3 year (37 month) warranty. At 5400 rpm, they may not be the quickest NAS drives available, but at less than £70 each (including Prime delivery), I consider these discs a bit of a bargain. So, thus far, I am most chuffed! Obviously, time will tell.....
Review: Works great for home Nas storage. - Been using 4 of these for the last 5 months and they have been working great. Only thing to note is use good quality sata cables otherwise they start giving errors. Replaced with good cables and never had another problem. Will be buying these again.

## Features

- Specifically designed for use in NAS systems with up to 8 bays
- Supports up to 180 TB/yr workload rate* |Workload Rate is annualized (TB transferred times (8760/recorded power-on hours)), workload rate will vary depending on your hardware and software components and configurations
- NASware firmware for compatibility
- Small and home office NAS systems in a 24/7 environment. 3-year manufacturer's limited warranty
- Note: The always-on environment of a NAS or RAID is a hot one, and desktop drives aren’t typically designed and tested under those conditions like WD Red

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B083XVY99B |
| Are Batteries Included | No |
| Best Sellers Rank | 51,408 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 177 in Internal Hard Drives |
| Brand | Western Digital |
| Colour | Red |
| Customer Reviews | 4.4 4.4 out of 5 stars (12,234) |
| Date First Available | 14 Jan. 2020 |
| Form Factor | 2.5 in3.5 in |
| Guaranteed software updates until | unknown |
| Hard Disk Description | Mechanical Hard Disk |
| Hard Disk Rotational Speed | 5400 RPM |
| Hard Drive Interface | eSATA |
| Hard Drive Size | 4 TB |
| Hardware Platform | Mac, PC |
| Item Weight | 560 g |
| Item model number | WD40EFAX |
| Lithium Battery Energy Content | 2 Kilowatt Hours |
| Lithium Battery Packaging | Batteries packed with equipment |
| Lithium Battery Weight | 2 Grams |
| Manufacturer | Western Digital |
| Number Of Lithium Ion Cells | 5 |
| Number of Lithium Metal Cells | 5 |
| Product Dimensions | 2.62 x 14.71 x 10.16 cm; 560 g |
| Series | DISQUE DUR WD RED 4TO 64MO CACHE SATAIII *WD40EFAX* (NAS STORAGE) 1036 |
| Standing screen display size | 24 Inches |
| Wattage | 4.8 watts |

## Product Details

- **Brand:** Western Digital
- **Colour:** Red
- **Compatible devices:** Desktop
- **Connectivity technology:** SATA
- **Digital storage capacity:** 4 TB
- **Hard disk description:** Mechanical Hard Disk
- **Hard disk form factor:** 3.5 Centimetres
- **Hard disk interface:** eSATA
- **Installation type:** Internal Hard Drive
- **Special feature:** Portable

## Images

![WD Red 4TB 3.5 Inch NAS Internal Hard Drive - 5400 RPM - WD40EFAX - Image 1](https://m.media-amazon.com/images/I/710aEelzoRL.jpg)

## Available Options

This product comes in different **Pattern, Size, Style** options.

## Questions & Answers

**Q: Is this a smr or cmr disk?**
A: This is a SMR Drive. 
WD##EFRX is CMR (Good for NAS)
WD##EFAX is SMR (Bad for NAS)

**Q: Why are there two of these on Amazon both exactly the same but different prices? The more expensive one has more reviews.**
A: One is SMR (Shingled Magnetic Recording, the other is not. This SMR version is completely unsuitable for NAS - do not buy it for that purpose. Search online to find the various articles about why SMR technology is entirely improper for NAS, even though Western Digital Red is sold as if it was. WD are being sued in the US to attempt to prevent them doing this - unusually this is not for money but just to block WD so that gives an idea how much of an issue this is. If you have already bought this disk for that purpose, return it and any problems, go down the 'unfit for the purpose for which it was sold/advertised'.

**Q: Is this good for nas running cctv?**
A: I use them in my nas although I do not use cctv I cannot see why they would not be ok.

**Q: The title of the listing of this product says 4tb but in the spec description it is listed as 3tb. which is it?**
A: Re: Western Digital RED NAS Hard Drives
I would be guided by the WD Hard Drive version stated. For Western Digital RED NAS Hard drives
it is currently WDxxEFRX, where xx equals the two digit drive size: eg 30 for 3TB, 40 for a 4TB.
However, for a 12TB it is normally WD120EFAX.
Trust this helps. Regards Ron

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good replacement drives in our home ZyXEL NAS
*by G***Y on 11 April 2020*

The two 1TB Seagate drives in our ZyXEL NAS326A were beginning to throw a few "Spin_Retry_Count" errors and were getting a bit noisy and hot. This is often a sign that the bearings are starting to go. As I also wanted to increase capacity, I opted for 2 of these WD NAS Red drives (2TB) - to run in a similar Raid-1 configuration. They arrived next day, factory sealed and well packaged direct from Amazon. Their manufacture date was November 2019 and the SMART information on each drive confirmed zero power on hours and zero accumulated errors. So I was able to swap one drive at a time with a rebuild in between. It took a few hours but everything seems fine. These new drives run a few degrees cooler than the older Seagate discs they replaced. They are also much quieter (though not silent). Transfer times are a marginal improvement - though that has never been an issue for us. After a week, we still have zero errors so I am satisfied everything is as it should be. Automatic backups to an external drive are also running smoothly. I was also able to register both drives on the WD website and received confirmation of the ~3 year (37 month) warranty. At 5400 rpm, they may not be the quickest NAS drives available, but at less than £70 each (including Prime delivery), I consider these discs a bit of a bargain. So, thus far, I am most chuffed! Obviously, time will tell.....

### ⭐⭐⭐⭐⭐ Works great for home Nas storage.
*by G***Y on 19 February 2022*

Been using 4 of these for the last 5 months and they have been working great. Only thing to note is use good quality sata cables otherwise they start giving errors. Replaced with good cables and never had another problem. Will be buying these again.

### ⭐⭐⭐⭐ WD Quality Issues?
*by G***F on 13 August 2021*

I have used Western Digital disks for decades and never had a failure. However the disk in my NAS failed recently. To my surprise it was a Western Digital Red. I replaced with this model, and the replacement disk had thousands of errors and was dead on arrival. I returned it and replaced with another which was a painless process with Amazon support. The end result is good but I'm worried Western Digital aren't what they used to be. Update 03/2023:. The new disk has now failed. Arranging return with WD Support as Amazon won't touch it. Update 11/2025: Both WD disks failed by end of 2023 and were replaced with Toshiba drives which are still going strong. WD mechanical disks are bit worth purchasing any more. I am still using WD SSDs and so far (touch wood), no issues.

## Frequently Bought Together

- Western Digital 4TB WD Red NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, SMR, 256MB Cache, 3.5" - WD40EFAX
- Synology 2-Bay DiskStation DS224+ (Diskless)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-12*