---
product_id: 184445581
title: "4TB WD Red NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, SMR, 256MB Cache, 3.5\" - WD40EFAX"
brand: "western digital"
price: "KSh63576"
currency: KES
in_stock: true
reviews_count: 9
category: "Western Digital"
url: https://www.desertcart.co.ke/products/184445581-4tb-wd-red-nas-internal-hard-drive-hdd-5400-rpm
store_origin: KE
region: Kenya
---

# 5400 RPM energy-efficient spin 4TB massive storage SATA 6 Gb/s ultra-fast interface 4TB WD Red NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, SMR, 256MB Cache, 3.5" - WD40EFAX

**Brand:** western digital
**Price:** KSh63576
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** 4TB WD Red NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, SMR, 256MB Cache, 3.5" - WD40EFAX by western digital
- **How much does it cost?** KSh63576 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.ke](https://www.desertcart.co.ke/products/184445581-4tb-wd-red-nas-internal-hard-drive-hdd-5400-rpm)

## 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 Capacity:** Store, archive, and share your critical data effortlessly with a spacious 4TB mechanical hard drive.
- • **Peace of Mind Warranty:** Backed by a 3-year limited warranty, ensuring your investment is protected and reliable for years to come.
- • **Reliable NAS Powerhouse:** Engineered for 24/7 multi-user NAS environments with NASware firmware ensuring seamless compatibility and durability.
- • **Robust Workload Handling:** Supports up to 180 TB/year workload rate, built to handle heavy data transfer demands without breaking a sweat.
- • **Optimized Performance & Efficiency:** 5400 RPM rotational speed balances quiet operation with energy efficiency, perfect for home office and personal NAS setups.

## Overview

The 4TB WD Red NAS Internal Hard Drive (WD40EFAX) is a purpose-built, 3.5-inch mechanical HDD designed for personal and home office NAS systems. Featuring a 5400 RPM spin speed, SATA 6 Gb/s interface, and NASware firmware, it delivers reliable, quiet, and efficient performance optimized for multi-bay NAS environments. With a hefty 256MB cache and support for up to 180 TB/year workload, it ensures robust data handling and longevity, backed by a 3-year limited warranty.

## Description

There’s a leading edge WD Red drive for every compatible NAS system to store your precious data. With drives up to 6TB, WD Red offers a wide array of storage for customers looking to build a NAS solution. Built and tested for personal and home NAS systems with up to 8-bays, these drives pack all the punch you need in one powerhouse unit for storing, archiving, and sharing. With WD RedTM, you’re ready for what’s next.

Review: Western Digital NAS Hard Drive - This is not your average Western Digital desktop hard drive. The WD Reds are made for heavy duty, high duty cycle use. They are made for use in Network Attached Storage devices. The NAS environment can really torture a hard drive. Especially when it has to support a lot of users and devices. This hard drive is made to be able to function in such an environment. I have a Terramaster NAS in my home network. That system has two Seagate Ironwolf hard drives. It has been flawless in operation. I attached an external hard drive enclosure to the Terramaster to have a backup of all the data. The hard drive enclosure does not come with its own hard drive. You get to choose, depending on your needs. I bought this WD Red hard drive to use as the backup for the Terramaster. I backup the data from the NAS on this hard drive and then store the drive in a safe location. The WD Red has been flawless. It is easily the equivalent of the Seagate Ironwolf. The operation is silent and reliable. I have not had any issues with these NAS hard drives. Yes you can use a regular desktop hard drive for this purpose. A WD Blue caviar hard drive will also work. However, the WD Red is a more robust hard drive. It is more expensive than a regular desktop hard drive. But the reliability and peace of mind are worth it. NAS hard drives will also work on your desktop computer. You can swap out your WD Blue hard drive for this one. You will get added durability and dependability. But it will only be worth the extra cost if your computer is regularly stressed. A one-user desktop PC that gets used for 5 hours per day is not under stress. However, if you have a PC that is used for security monitoring purposes or as a home server, then yes, invest in a more robust hard drive. I love solid state hard drives for their performance and lighter weight when used on a laptop. However, for storage purposes, I still prefer a mechanical hard drive. If I were building my own desktop PC, yes, I would use a NAS hard drive such as the WD Red. But I would not throw out a working WD Blue that comes with a new PC. Evaluate your needs carefully. A data storage system used in a business setting should have robust hard drives. If you are a content creator on Youtube, get at least a four bay NAS storage device and fill those drive bays with WD Reds or Seagate Ironwolves. If you surf the internet, shop online, and basically only consume social media, then a regular PC with a traditional desktop hard drive will be good enough. Highly recommended for NAS Storage systems and heavy-duty desktop use.
Review: Works exactly as expected - This hard drive does exactly what it promises. It's fast, quiet, and reliable. Perfect for NAS setups or internal storage. Western Digital remains a solid choice for quality and performance.

## Features

- Available in capacities ranging from 2-6TB with support for up to 8 bays
- 5400RPM performance class
- NASware firmware for compatibility
- NAS systems with daily workloads associated with personal and home office environments and idle time available to perform necessary background operations
- Supports up to 180 TB/yr Workload Rate Workload Rate is defined as the amount of user data transferred to or from the hard drive. Workload Rate is annualized (TB transferred ✕ (8760 / recorded power-on hours))
- 3-year limited warranty

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B083XVY99B |
| Best Sellers Rank | #24 in Internal Hard Drives |
| Brand | Western Digital |
| Color | Red |
| Customer Reviews | 4.5 4.5 out of 5 stars (12,435) |
| Date First Available | January 15, 2020 |
| Flash Memory Size | 4 TB |
| Hard Drive | 4 TB Mechanical Hard Disk |
| Hard Drive Interface | Serial ATA-600 |
| Hard Drive Rotational Speed | 5400 RPM |
| Hardware Platform | Mac, PC |
| Is Discontinued By Manufacturer | No |
| Item Dimensions LxWxH | 1.03 x 5.79 x 4 inches |
| Item Weight | 1.23 pounds |
| Item model number | WD40EFAX |
| Language | English, English, English, English, English |
| Manufacturer | Western Digital |
| Product Dimensions | 1.03 x 5.79 x 4 inches |
| Series | WD Red |
| Standing screen display size | 24 Inches |

## Product Details

- **Brand:** Western Digital
- **Color:** Red
- **Compatible Devices:** Storage System
- **Connectivity Technology:** SATA
- **Digital Storage Capacity:** 4 TB
- **Hard Disk Description:** Mechanical Hard Disk
- **Hard Disk Form Factor:** 3.5 Inches
- **Hard Disk Interface:** Serial ATA-600
- **Installation Type:** Internal Hard Drive
- **Special Feature:** Portable

## Images

![4TB WD Red NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, SMR, 256MB Cache, 3.5" - 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: Efax suffix means these drives are using smr, right?**
A: Western Digital's complete lack of information regarding this particular drive's use of SMR or PMR would lead me to believe that they are still shipping drives that could use either. (They also produce them from more than one contracted facility) It is my understanding that older versions of this drive use PMR while the more recently manufactured versions will use SMR. If you call customer support to inquire, they will tell you that they are only able to give a definitive answer on whether the drive uses SMR or PMR if you provide them a serial number. This would indicate to me that they have drives with the same product number using both technologies. Also, if you review the specs for the drive on their site, there is absolutely no mention of PMR or SMR. However, if you look at some other WD manufactured drives, such as the Ultrastar DC HC520 12 TB it is clearly marked and identified as a PMR drive.

**Q: Can you please confirm if this drive is smr or pmr? drives with smr are inappropriate for in zfs storage pools and may cause loss of data.**
A: SMR. Western digital was hit with a class action lawsuit because they did not advertise this fact. I bought one in 2020 and it failed just past the 2 year mark. Dont buy this drive for a NAS, which is exactly what's its marketed as.

**Q: Wd red 8tb is smr or cmr? it is the same "efax" suffix in the model number as 6tb or 4tb, and those are smr**
A: WD does not specify SMR versus CMR.  WD has confirmed that the EFAX line has transitioned to SMR for the 2T to 6T drives.  That's only for today, and subject to change at any time.  Just my opinion, but it seems unlikely to me that all EFAX drives will not transition to SMR eventually.  The only thing we know for sure is that WD is super secretive on the subject and will not disclose the information until forced to do so.  If CMR is important to you, your choices in the WD brand are Black or Red Pro.  Personally, I'm switching my brand loyalty to Seagate for being completely transparent as to which of their drives are CMR and which are SMR.

**Q: Why only support for up to 8 bays? What would be the impact of running 12 of these in a single appliance?**
A: Your limitation in drives is variant on your case and software.  You can have more than 8 bays if you know what you are doing.  Personally I run a Plex server and have 28 bays among 3 servers linked and raided to be able to lose 3 drives without losing data.

You can literally buy all the hardware on Amazon and build it yourself.

Software I use is a lifetime license from StableBit Drive Pool.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Western Digital NAS Hard Drive
*by C***I on August 30, 2020*

This is not your average Western Digital desktop hard drive. The WD Reds are made for heavy duty, high duty cycle use. They are made for use in Network Attached Storage devices. The NAS environment can really torture a hard drive. Especially when it has to support a lot of users and devices. This hard drive is made to be able to function in such an environment. I have a Terramaster NAS in my home network. That system has two Seagate Ironwolf hard drives. It has been flawless in operation. I attached an external hard drive enclosure to the Terramaster to have a backup of all the data. The hard drive enclosure does not come with its own hard drive. You get to choose, depending on your needs. I bought this WD Red hard drive to use as the backup for the Terramaster. I backup the data from the NAS on this hard drive and then store the drive in a safe location. The WD Red has been flawless. It is easily the equivalent of the Seagate Ironwolf. The operation is silent and reliable. I have not had any issues with these NAS hard drives. Yes you can use a regular desktop hard drive for this purpose. A WD Blue caviar hard drive will also work. However, the WD Red is a more robust hard drive. It is more expensive than a regular desktop hard drive. But the reliability and peace of mind are worth it. NAS hard drives will also work on your desktop computer. You can swap out your WD Blue hard drive for this one. You will get added durability and dependability. But it will only be worth the extra cost if your computer is regularly stressed. A one-user desktop PC that gets used for 5 hours per day is not under stress. However, if you have a PC that is used for security monitoring purposes or as a home server, then yes, invest in a more robust hard drive. I love solid state hard drives for their performance and lighter weight when used on a laptop. However, for storage purposes, I still prefer a mechanical hard drive. If I were building my own desktop PC, yes, I would use a NAS hard drive such as the WD Red. But I would not throw out a working WD Blue that comes with a new PC. Evaluate your needs carefully. A data storage system used in a business setting should have robust hard drives. If you are a content creator on Youtube, get at least a four bay NAS storage device and fill those drive bays with WD Reds or Seagate Ironwolves. If you surf the internet, shop online, and basically only consume social media, then a regular PC with a traditional desktop hard drive will be good enough. Highly recommended for NAS Storage systems and heavy-duty desktop use.

### ⭐⭐⭐⭐⭐ Works exactly as expected
*by C***S on July 10, 2025*

This hard drive does exactly what it promises. It's fast, quiet, and reliable. Perfect for NAS setups or internal storage. Western Digital remains a solid choice for quality and performance.

### ⭐⭐⭐⭐⭐ 6TB Hard Drive Worked Great!
*by T***A on November 20, 2025*

Buying anything off Amazon related to computer equipment can be a risk. Great experience from this seller and would buy 4 more hard drives if I had the money. Received it, bench tested and ran with no errors. Formatted and spun right up on my NAS. Great customer service and very responsive! Saving for future purchases 5 Star!

## 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 Kenya*
*Store origin: KE*
*Last updated: 2026-02-17*