---
product_id: 195809213
title: "WD Red 4TB 3.5 Inch NAS Internal Hard Drive - 5400 RPM - WD40EFAX"
brand: "western digital"
price: "€ 388.94"
currency: EUR
in_stock: true
url: https://www.desertcart.it/products/195809213-wd-red-4tb-3-5-inch-nas-internal-hard-drive
store_origin: IT
region: Italy
---

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

**Brand:** western digital
**Price:** € 388.94
**Availability:** ✅ In Stock

## Summary

> 🔴 Power Your NAS with WD Red: Reliable Storage That Never Sleeps

## 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?** € 388.94 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/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

- • **Massive 4TB Storage:** Store your critical data, backups, and media libraries with confidence in a spacious 4TB capacity.
- • **Engineered for NAS Mastery:** Specifically designed for seamless integration in NAS systems with up to 8 bays, ensuring reliable 24/7 performance.
- • **Optimized RPM for Durability:** Runs at 5400 RPM to balance power efficiency and quiet operation, perfect for always-on NAS environments.
- • **Workload-Ready for Heavy Use:** Handles up to 180 TB of data transfer annually, built to keep pace with demanding small office and home NAS setups.
- • **NASware Firmware Compatibility:** Enhanced firmware ensures smooth compatibility and error recovery, minimizing downtime and maximizing data integrity.

## Overview

The WD Red 4TB NAS Internal Hard Drive (WD40EFAX) is purpose-built for small and home office NAS systems, offering 4TB of reliable storage with a 5400 RPM spindle speed optimized for 24/7 operation. It supports up to 180 TB/year workload, backed by NASware firmware for enhanced compatibility and durability, making it the go-to choice for professionals seeking dependable, always-on network storage.

## Description

Full description not available

## 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 |
|---------------|-------|
| Brand | Western Digital |
| Product Dimensions | 2.62 x 14.71 x 10.16 cm; 560 g |
| Item model number | WD40EFAX |
| Manufacturer | Western Digital |
| Series | DISQUE DUR WD RED 4TO 64MO CACHE SATAIII *WD40EFAX* (NAS STORAGE) 1036 |
| Colour | Red |
| Form Factor | 2.5 in3.5 in |
| Standing screen display size | 24 Inches |
| Hard Drive Size | 4 TB |
| Hard Disk Description | Mechanical Hard Disk |
| Hard Drive Interface | eSATA |
| Hard Disk Rotational Speed | 5400 RPM |
| Wattage | 4.8 watts |
| Hardware Platform | Mac, PC |
| Are Batteries Included | No |
| Lithium Battery Energy Content | 2 Kilowatt Hours |
| Lithium Battery Packaging | Batteries packed with equipment |
| Lithium Battery Weight | 2 Grams |
| Number Of Lithium Ion Cells | 5 |
| Number of Lithium Metal Cells | 5 |
| Item Weight | 560 g |
| Guaranteed software updates until | unknown |

## Product Details

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

## 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 **Capacity, Colour** 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

## 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 Italy*
*Store origin: IT*
*Last updated: 2026-01-28*