Dark mode
only hard drivesin all categories
only hard drives
United Kingdom

WD NasWare Red WD40EFRX 4 TB
CMR

Photos - Hard Drive WD NasWare Red WD40EFRX 4 TB CMR
from £128.45 up to £164.00 
add to listmy lists
WD WD40EFRX
Red (NAS)3 year warranty
1 TB2 TB3 TB
CMR
4 TB
CMR
4 TB
SMR
6 TB
CMR
Placement
built-in
Type
HDD
Features
server
Size
4000 GB
Form factor
3.5 "
Connection
SATA3
Manufacturer's warranty
3 years
Cache memory
64 MB
Record technology
CMR
RPM
5400 rpm
Operation power consumption
4.5 W
Standby power consumption
3.3 W
Shockproof
65 G
Reading noise level
28 dB
Standby mode noise level
25 dB
MTBF
1 M h
MTBF
600 K
Added to E-Catalog
october 2013
Optimized for RAID and NAS.
Not suitable for the role of the main system disk.
The information in the model description is for reference purposes.
Always clarify the specifications and configuration of the product with the online store manager before purchasing.
Catalog WD 2025 - new arrivals, bestsellers, and the most relevant models WD.
How to Choose a Hard DriveUnderstanding how to choose the right HDD for gaming, video recording, server, and other tasks

Buy WD NasWare Red WD40EFRX 4 TB
CMR

When you make a purchase through links on our site, we may receive a affiliate commission.

WESTERN DIGITAL HDD WD NAS 35 4TB 7200RPM 256MB SATA3 RED PRO WD40EFRX-68AX9N0

Western Digital HDD WD NAS 3.5'' 4TB 7200RPM 256MB SATA3 RED PRO
Amazon.co.uk
Delivery: to United Kingdom
Report
£164.00
Buy in shop

Western Digital Red 4TB internal hard drive Variable 64 MB 3.5" S WD40EFRX-RFB

Western Digital Red 4TB internal hard drive Variable 64 MB 3.5" Serial ATA III
ComputersDeal.com
Delivery: in United Kingdom
Report
£147.74
Buy in shop

Western Digital Red 4TB internal hard drive Variable 64 MB 3.5" S WD40EFRX-RFB

Expanded solutionsOur formula of success has led growth of WD Red into higher capacities and expansion into new 2.5-inch solutions. We now offer a broader. more comprehensive portfolio of NAS hard drives for our customers. It is not just about NAS drives. it is REDvolutionary.Next generation experienceEvery component. line of code. and product deci... moresion was built on our passion and determination to deliver the best NAS experience.The next generation of WD Red hard drives delivers on this promise with massive capacity and NASware 2.0. which further improves drive reliability and protects your data in the event of a power loss or power disruption.Experienced in NASIn all of our cultures around the world. first impressions are what leave a mark. With superior technology that is driven to impress. WD Red is a reflection of the most extensive NAS partner compatibility-testing list that is available on the market*. That means when you buy a NAS enclosure. you can trust that WD Red will be the most compatible drive available. Our pride is in our product and our vision is shared with our customers.NAS for homeTake your connected home environment to the next level with a NAS system that is equipped with WD Red hard drives and enjoy streaming your media. backing up your computers. file sharing and managing your digital content faster and easier.WD Red's NASware 2.0 experience with increased compatibility makes sharing from your mobile device. computer. TV. stereo and more an instant gratification. And with capacities now available in 4 TB. a 5-bay NAS system can hold close to 20 terabytes of data!NAS for small businessIncrease the efficiency and productivity of your small business with WD Red hard drives for your 1 to 5 bay NAS system. WD Red comes equipped with NASware 2.0. which increases system compatibility allowing for seamless integration with your existing network infrastructure. Add value to your business by enabling your employees to quickly share their files and back up folders reliably with WD Red NAS hard drives in your NAS solution.
itsupplies.uk
Delivery: to United Kingdom
Report
£147.74
Buy in shop

Western Digital WD Red WD40EFRX 4 TB 90521093

SATA hard drives (SATA) WD Red WD40EFRX 4 TB
Amazon.co.uk
Delivery: to United Kingdom
Report
£128.45
Buy in shop
Series WD Red (NAS)Compare using chart →
WD Red Pro WD8003FFBX
from £186.73 
8000 GB, built-in, server, 3.5 ", buffer: 256 MB, 7200 rpm, connection: SATA3, warranty 5 years
WD Red Pro WD181KFGX
from £392.03 
18000 GB, built-in, server, 3.5 ", buffer: 512 MB, write CMR, 7200 rpm, connection: SATA3, warranty 5 years
WD Red Pro WD4005FFBX
from £122.49 
4000 GB, built-in, server, 3.5 ", buffer: 256 MB, write CMR, 7200 rpm, connection: SATA3, warranty 5 years
WD Red Pro WD121KFBX
from £313.99 
12000 GB, built-in, server, 3.5 ", buffer: 256 MB, 7200 rpm, connection: SATA3, warranty 5 years
WD Red Pro WD161KFGX
from £347.99 
16000 GB, built-in, server, 3.5 ", buffer: 512 MB, write CMR, 7200 rpm, connection: SATA3, warranty 5 years
WD Red Pro WD2002FFSX
from £96.12 
2000 GB, built-in, server, 3.5 ", buffer: 64 MB, write CMR, 7200 rpm, connection: SATA3, warranty 5 years
WD Red Pro WD4003FFBX
from £133.15 
4000 GB, built-in, server, 3.5 ", buffer: 256 MB, write CMR, 7200 rpm, connection: SATA3, warranty 5 years
WD Red Pro WD103KFBX
from £264.99 
10000 GB, built-in, server, 3.5 ", buffer: 512 MB, write CMR, 7200 rpm, connection: SATA3, warranty 5 years
WD NasWare Red WD40EFRX
from £128.45 
4000 GB, built-in, server, 3.5 ", buffer: 64 MB, write CMR, 5400 rpm, connection: SATA3, warranty 3 years
WD Red Pro WD142KFGX
from £320.06 
14000 GB, built-in, server, 3.5 ", buffer: 512 MB, write CMR, 7200 rpm, connection: SATA3, warranty 5 years
WD Red Pro WD6005FFBX
from £185.99 
6000 GB, built-in, server, 3.5 ", buffer: 256 MB, write CMR, 7200 rpm, connection: SATA3, warranty 5 years
WD Red Pro WD102KFBX
from £318.76 
10000 GB, built-in, server, 3.5 ", buffer: 256 MB, write CMR, 7200 rpm, connection: SATA3, warranty 5 years
WD NasWare Red WD20EFRX
from £79.43 
2000 GB, built-in, server, 3.5 ", buffer: 64 MB, write CMR, 5400 rpm, connection: SATA3, warranty 3 years
WD NasWare Red WD10EFRX
from £65.40 
1000 GB, built-in, server, 3.5 ", buffer: 64 MB, write CMR, 5400 rpm, connection: SATA3, warranty 3 years
WD Red Pro WD240KFGX
from £553.52 
24000 GB, built-in, server, helium, 3.5 ", buffer: 512 MB, write CMR, 7200 rpm, connection: SATA3, warranty 5 years
WD Red Pro WD6003FFBX
from £187.99 
6000 GB, built-in, server, 3.5 ", buffer: 256 MB, 7200 rpm, connection: SATA3, warranty 5 years
WD Red WD20EFAX
from £123.45 
2000 GB, built-in, server, 3.5 ", buffer: 256 MB, write SMR, 5400 rpm, connection: SATA3
WD NasWare Red WD40EFAX
from £151.01 
4000 GB, built-in, server, 3.5 ", buffer: 256 MB, write SMR, 5400 rpm, connection: SATA3, warranty 5 years
WD Red Pro WD141KFGX
from £398.99 
14000 GB, built-in, server, 3.5 ", buffer: 512 MB, write CMR, 7200 rpm, connection: SATA3, warranty 5 years
WD NasWare Red WD30EFRX
from £99.99 
3000 GB, built-in, server, 3.5 ", buffer: 64 MB, write CMR, 5400 rpm, connection: SATA3, warranty 3 years

WD NasWare Red WD40EFRX configurations

Price for WD NasWare Red WD40EFRX
WD NasWare Red WD10EFRX 1 TBfrom £65.402 offers
WD NasWare Red WD20EFRX 2 TBfrom £79.434 offers
WD NasWare Red WD30EFRX 3 TB
CMR
from £99.995 offers
WD NasWare Red WD40EFRX 4 TB
CMR
from £128.454 offers
WD NasWare Red WD40EFAX 4 TB
SMR
from £151.012 offers
WD NasWare Red WD60EFRX 6 TB
CMR
from £382.201 offer
Video reviews

Red Baron

De jure, WD Red is a hard drive for creating RAID arrays (mirror or serial) and installing in NAS servers. The spindle speed is 5400 rpm, that is, compared to other PC components, it is almost silent. 64 MB of buffer memory to speed up the processing of the smallest files. Sequential read and write is performed at 150 – 160 MB / s, which is quite fast by the standards of low-speed HDDs.

Round the clock work

Implemented in Red a number of proprietary technologies WD. First, NASware 3.0 firmware provides 100% compatibility with popular NAS server models, 24/7 operation, and easy RAID scalability. Simply put, you can install additional drives even without having to reboot your PC or NAS server — the operating system will attach them to the shared disk space, as they say, "on the fly".

Quiet and smooth

Secondly, 3D Active Balance Plus balances magnetic plates in two planes with precision, thereby reducing vibration and increasing HDD reliability. Finally, thirdly, IntelliPower automatically changes the data transfer rate and the smart caching algorithm depending on the load. Indeed, from our personal experience we can confirm that Red, regardless of the size, are among the quietest 3.5-inch HDDs on the market.

For home and office

But de facto, the WD Red is a fairly versatile, quiet and reliable hard drive that's great for a home or work PC as an addition to a fast but low-capacity SSD. That is, whether the scope of its application is not limited to NAS servers alone. WD Red is not suitable except for the role of the main system drive — for this task it is better to choose Blue or Black at 7200 rpm (read and write speed 200 – 220 MB / s).

We recommendCompare using chart →
WD Red Plus WD40EFZX
from £126.79 
4000 GB, built-in, server, 3.5 ", buffer: 128 MB, write CMR, 5400 rpm, connection: SATA3, warranty 3 years
Seagate IronWolf ST4000VN008
from £155.00 
4000 GB, built-in, server, 3.5 ", buffer: 64 MB, write CMR, 5900 rpm, connection: SATA3, warranty 3 years
WD SE WD4000F9YZ
from £130.20 
4000 GB, built-in, server, 3.5 ", buffer: 64 MB, 7200 rpm, connection: SATA3, warranty 5 years
WD RE WD4000FYYZ
from £109.97 
4000 GB, built-in, server, 3.5 ", buffer: 64 MB, 7200 rpm, connection: SATA3, warranty 5 years
Toshiba N300 HDWG440UZSVA
from £111.24 
4000 GB, built-in, server, 3.5 ", buffer: 256 MB, 7200 rpm, connection: SATA3, warranty 3 years
WD Gold Enterprise Class WD4004FRYZ
from £136.38 
4000 GB, built-in, server, 3.5 ", buffer: 256 MB, 7200 rpm, connection: SATA3, warranty 5 years
WD Red Pro WD4003FFBX
from £133.15 
4000 GB, built-in, server, 3.5 ", buffer: 256 MB, write CMR, 7200 rpm, connection: SATA3, warranty 5 years
Toshiba MG04ACAxxxxE MG04ACA400E
from £135.54 
4000 GB, built-in, server, 3.5 ", buffer: 128 MB, 7200 rpm, connection: SATA3, warranty 5 years
Seagate Exos 7E8 ST4000NM000A
from £118.46 
4000 GB, built-in, server, 3.5 ", buffer: 256 MB, 7200 rpm, connection: SATA3, warranty 5 years
Toshiba MG08 MG08ADA400E
from £144.49 
4000 GB, built-in, server, 3.5 ", buffer: 256 MB, write CMR, 7200 rpm, connection: SATA3, warranty 5 years
Seagate Exos 7E10 512n SATA ST4000NM000B
from £136.74 
4000 GB, built-in, server, 3.5 ", 7200 rpm, connection: SATA3, warranty 5 years
Seagate IronWolf Pro ST4000NT001
from £118.58 
4000 GB, built-in, server, 3.5 ", buffer: 256 MB, write CMR, 7200 rpm, connection: SATA3, warranty 5 years
Filters
Models
WD NasWare Red often compared
Toshiba X300
WD NasWare Red
[WD40EFRX]
vs
Toshiba X300
[HDWE140EZSTA]
WD Blue
WD NasWare Red
[WD40EFRX]
vs
WD Blue
[WD40EZRZ]
Seagate SkyHawk
WD NasWare Red
[WD40EFRX]
vs
Seagate SkyHawk
[ST4000VX007]