---
product_id: 113561397
title: "Western Digital WD40EFRX WD Red NAS Hard Drive - Hard drive - 4 TB - internal - 3.5 inch - SATA 6Gb/s - buffer: 64 MB - for WD My Cloud EX2, EX4"
brand: "western digital"
price: "€ 251.84"
currency: EUR
in_stock: false
reviews_count: 13
url: https://www.desertcart.sk/products/113561397-western-digital-wd40efrx-wd-red-nas-hard-drive-hard-drive
store_origin: SK
region: Slovakia
---

# Western Digital WD40EFRX WD Red NAS Hard Drive - Hard drive - 4 TB - internal - 3.5 inch - SATA 6Gb/s - buffer: 64 MB - for WD My Cloud EX2, EX4

**Brand:** western digital
**Price:** € 251.84
**Availability:** ❌ Out of Stock

## Quick Answers

- **What is this?** Western Digital WD40EFRX WD Red NAS Hard Drive - Hard drive - 4 TB - internal - 3.5 inch - SATA 6Gb/s - buffer: 64 MB - for WD My Cloud EX2, EX4 by western digital
- **How much does it cost?** € 251.84 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/113561397-western-digital-wd40efrx-wd-red-nas-hard-drive-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

## Description

wd A Long-time Leader In Hard Drive Technology Designs And Manufactures The #1 Selling Internal And External Hard Drives And Award-winning Media Players And Network Drives

Review: Works great in TrueNAS - Works great as a replacement drive in my TrueNAS configuration.
Review: Good drive for the price! - It does it’s job well! Good price too

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01IF6879G |
| Best Sellers Rank | #269 in Internal Hard Drives |
| Brand | Western Digital |
| Color | Red |
| Customer Reviews | 4.0 4.0 out of 5 stars (179) |
| Date First Available | December 11, 2013 |
| Flash Memory Size | 4 |
| Hard Drive | Raid |
| Hard Drive Interface | SATA 6 GB/s |
| Hard Drive Rotational Speed | 5400 RPM |
| Hardware Platform | PC |
| Is Discontinued By Manufacturer | No |
| Item Dimensions LxWxH | 4.02 x 5.79 x 1.02 inches |
| Item Weight | 0.01 ounces |
| Item model number | WD40EFRX |
| Manufacturer | WESTERN DIGITAL TECH |
| Number of Processors | 4 |
| Product Dimensions | 4.02 x 5.79 x 1.02 inches |
| Series | My Cloud EX2 |

## Product Details

- **Brand:** Western Digital
- **Color:** Red
- **Compatible Devices:** Desktop
- **Connectivity Technology:** SATA
- **Digital Storage Capacity:** 4000 GB
- **Hard Disk Description:** Raid
- **Hard Disk Form Factor:** 3.5 Inches
- **Hard Disk Interface:** SATA 6 GB/s
- **Installation Type:** Internal Hard Drive
- **Special Feature:** Portable

## Images

![Western Digital WD40EFRX WD Red NAS Hard Drive - Hard drive - 4 TB - internal - 3.5 inch - SATA 6Gb/s - buffer: 64 MB - for WD My Cloud EX2, EX4 - Image 1](https://m.media-amazon.com/images/I/516ATVgjPOS.jpg)
![Western Digital WD40EFRX WD Red NAS Hard Drive - Hard drive - 4 TB - internal - 3.5 inch - SATA 6Gb/s - buffer: 64 MB - for WD My Cloud EX2, EX4 - Image 2](https://m.media-amazon.com/images/I/81f5g0jhRRL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works great in TrueNAS
*by M***E on October 2, 2025*

Works great as a replacement drive in my TrueNAS configuration.

### ⭐⭐⭐⭐⭐ Good drive for the price!
*by R***Z on May 22, 2021*

It does it’s job well! Good price too

### ⭐ Uh.... No.
*by S***D on October 30, 2025*

Drive failed on install. Oyen 5 bay ran 3 days. No workee. Called WD. Turns out unit warranty expired 2019. In other words, i paid money for a non-functional museum piece. Waste of my time. 5-star on the flake-o-meter.

## Frequently Bought Together

- Western Digital WD40EFRX WD Red NAS Hard Drive - Hard drive - 4 TB - internal - 3.5 inch - SATA 6Gb/s - buffer: 64 MB - for WD My Cloud EX2, EX4
- Western Digital 12TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 256 MB Cache, 3.5" - WD120EFAX

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**Shop now:** [https://www.desertcart.sk/products/113561397-western-digital-wd40efrx-wd-red-nas-hard-drive-hard-drive](https://www.desertcart.sk/products/113561397-western-digital-wd40efrx-wd-red-nas-hard-drive-hard-drive)

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-01-30*