Western Digital Red 3.5″ 4000 GB Serial ATA III

£100.24 (£83.53 + VAT)

Western Digital Red. HDD size: 3.5″, HDD capacity: 4000 GB, HDD speed: 5400 RPM

In stock

SKU: WD40EFAX Category:

Product Information

The WD Red drive is built for single-bay to 8-bay NAS systems and packs the capacity to store your precious data in one powerhouse unit. 

Cooler Temperatures

By reducing power consumption, the operating temperature of your NAS stays cool. With a lower temperature in your system, you can create a more reliable solution for your NAS.

Built for NAS Compatibility

WD Red drives with NASware technology are purpose-built to balance performance and reliability in NAS and RAID environments.

Desktop Drive vs. WD Red Drive

A desktop hard drive is not typically tested and designed for NAS environments. WD Red has features such as NAS compatibility, increased reliability and more.
WD Red for Home

Stream, backup, organize and effortlessly share your digital content to your TV, PC and more. NASware technology increases your drives' compatibility with your NAS system, for better playback with your devices.

WD Red for Small Business

Businesses thrive on productivity and efficiency, two guiding principles built into the design of the WD Red drive. Share and backup files at the speed of your business with a WD Red drive in your NAS.

WD Red for Big Business

Looking for maximum performance in a heavy use NAS? The WD Red Pro drive is designed to handle an increase in workload and system demand and features a 5-year limited warranty.

Designed for NAS

Desktop drives aren't purpose-built for NAS. But WD Red drives with NASware 3.0 are. Our exclusive technology takes the guesswork out of selecting a drive. We can help you find the perfect storage for your NAS system.

3D Active Balance Plus

Helps to ensure your data is protected from excessive vibration and noise in a NAS or RAID environment. This dual-plane balance control maintains your drive’s performance over time.

Premium Support and a 3-year Limited Warranty

Confidently upgrade to the best in NAS drive performance with the assurance of a 3-year limited warranty and world-class support services included with every WD Red drive.

24/7 Reliability

Since your NAS system is always on, a highly reliable drive is essential for long term reliability. Desktop drives are not designed and tested in 24×7 conditions, which is a foundation of WD Red NAS hard drives.




Operating shock

65 G

Storage drive buffer size

256 MB

Storage drive adapter included


Start/stop cycles




Non-operating shock

250 G

Power consumption (write)

4.8 W

Power consumption (read)

4.8 W


570 g

Power consumption (idle)

3.1 W

Operating voltage

5 / 12 V

Operating temperature (T-T)

0 – 60 °C



101.6 mm

Workload rate limit

180 TB/year

Storage temperature (T-T)

-40 – 70 °C

Power consumption (standby)

0.4 W

24/7 operation


Start-up current

1.75 A

Noise level (idle)

23 dB

Advanced Format (AF)


Component for



147 mm

HDD capacity

4000 GB

HDD interface transfer rate

6 Gbit/s

Sustainability certificates


HDD size


HDD speed

5400 RPM


26.1 mm




Serial ATA III

Mean time between failures (MTBF)

1000000 h

Native Command Queuing (NCQ)


HDD sustained transfer rate

180 MiB/s