Hard drive - internal
Native Command Queuing (NCQ), IntelliPower, Advanced Format technology, NAS compatible, NASware technology, 3D Active Balance Plus, S.M.A.R.T.
Drive Transfer Rate
600 MBps (external)
Internal Data Rate
1 per 10^14
Load / Unload Cycles
Expansion & Connectivity
1 x SATA 6 Gb/s - 7 pin Serial ATA
3.5" x 1/3H
4.5 Watt (read) ¦ 4.5 Watt (write) ¦ 3.3 Watt (idle) ¦ 0.4 Watt (sleep)
Service & Support
Limited warranty - 3 years
Min Operating Temperature
Max Operating Temperature
65 g @ 2ms (operating) / 250 g @ 2ms (non-operating)
WD My Cloud EX2 ¦ WD My Cloud EX4
WD Red 4TB NAS Desktop Hard Disk Drive - Intellipower SATA 6 Gb/s 64MB Cache 3.5 Inch (WD40EFRX)
Thinking of upgrading your system with a more reliable and sufficient hard drive? Look no further. Here's the WD Red NAS 4TB HDD (WD40EFRX).
In line with the WD Red series, the WD40EFRX provides impressive performance to help small to large-scale businesses from any industry to achieve their goals and get better results. With 4TB data capacity, this WD HDD is able to accommodate a wide range of data to suit your business or personal needs.
From business documents, domestic files, media files like photos, videos and music, to the application programs you need to be productive throughout the day, the NAS WD Red 4TB is ready to help you store, backup and access your data at your own convenience.
Running on a SATA 6 Gbps interface, the WD40EFRX provides supplementary performance for users to help them achieve the results they need. That works incredibly well considering, the drive is also able to transfer data with speeds reaching 600 MB per second, allowing you to successfully transfer files to and from your computer.
With up to a million hours of reliability, the NAS WD Red Pro 4TB ensures that this upgrade will be cost-efficient, making every penny spent worth it by providing a performance that will help your from start to finish.
Energy-conserving operations also contribute to the drive's successful performance by regulating the power consumed depending on the activity you do. This also allows the drive to prevent it from overheating which can lead to system failure or data loss.
Keep your data ready for access and easy to save with the 4TB Western Digital Red Pro WD40EFRX NAS SATA drive!
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WD Purple 4TB Surveillance Hard Disk Drive - Intellipower SATA 6 Gb/s 64MB
WD Red NAS Hard Drives
The WD Red family just got bigger
Our formula of success has led to the growth of WD Red into the highest capacities possible. Available up to 6 TB, WD offers an even broader, more comprehensive portfolio of NAS solutions for our customers spanning from a total of 1 to 8 bays. The WD Red family just got bigger.
NASware grows to 3.0
Built off of our determination to deliver the best NAS experience, NASware 3.0 extends our promise by further optimizing WD Red for the NAS environment with added support for 6 to 8 NAS bays. WD Red now supports small NAS systems from 1 to 8 bays thanks to NASware 3.0, which further improves drive compatibility and reliability. At 48 TB of total capacity in an 8 bay system, WD Red expands your NAS experience.
Designed specifically with SMB customers in mind, the WD Red family has expanded with the addition of WD Red Pro, which is available for the 8 to 16 bay medium to large-scale NAS environments. With capacities up to 6 TB, WD Red Pro carries a 5-year limited warranty and was engineered to handle the increased workloads from your business.
Experienced in NAS
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.