The WD My Cloud EX4100 is a very standard looking black NAS unit. Four front accessible and hot-swappable drive bays, and a USB port with one-press-key copy function. WD also added a two-line display that can provide you with device and setup information.

Pre-configured including hard disk drives; Solid performance; Good features; Dual Gigabit Ethernet; Dual PSU support; USB 3.0 with one-touch copy; LCD Display

no eSATA

WD is fast becoming a serious player in the world of network-attached storage (NAS). Following on from the launch of the original My Cloud back in late 2013, the storage specialist has gone on to expand its portfolio with the consumer-oriented My Cloud Mirror and the prosumer My Cloud EX Series .

Good all-round performance; Energy efficient hardware; User friendly My Cloud OS; Optimised WD Red hard drives; Tool-free drive bays; Low noise operation

Not as feature packed as the competition

Overall I like the unit and have no buyer's remorse beyond the remote drive mapping issue. If you are technically inclined, there are ways around the issue, but they are cumbersome and the unit should come with this common NAS functionality.

After years of having multiple external drives that mirror each other, This little beauty lets you put all your stuff in one place and with the RAID 5 you are protected; I found the setup of the unit and mycloud.com very easy.

What TOTALLY detracts from this unit is the lack of availability to map a network drive when you are in a remote situation; Doing some research I found that this was an option before the big upgrade, and MANY complaints on the internet about it.

Singularly the worst storage purchase I have ever made. Two out of the four the hard drives have failed and it appears the second during a rebuild of the first. RMA process flawed beyond belief with support staff who do not understand the product and requiring buyer funded international postage to...

Shipped with two 4TB drives in a RAID 1 configuration. As a result you only get 3.98TB of storage. If you want the full 8TB of storage you have to downgrade to a JBOD! I called Western Digital and was advised to buy two more Western Digital Red's to use the RAID 5 or 10.

Excellent bit of kit. Set up straight forward. Automatic Firmware update downloaded/installed within minutes of connecting the internet. WD software is excellent (No glitches yet). Running Raid 5 + 1 with 4 x 4TB WD Reds.

WD created the My Cloud EX line for prosumers who want network-attached storage (NAS) that can be accessed from many different types of computers, including tablets and phones. The newest addition, the EX4100, can hold up to 24TB in four drive bays.

Easy to use UI; Wide range of accessibility; Strong 8k 70/30 RAID10 iSCSI performance

Low performance in our 8K sequential tests

WD's My Cloud EX4100 is a downmarket Marvell-based version of the top-of-line Intel Atom based My Cloud DL4100 reviewed a few months ago. There's also the two-bay EX2100 we won't be reviewing, if you prefer your NASes in RAID 1 form with a slightly slower processor and half the memory.

I purchased one of these three years ago. My office flooded and I lost the power supply. Seemed easy enough. Call WD and get new one. But this company claimed there was no such part. I purchased another whole unit just for the cord. So, I do not recommend Western Digital because they are not honest.

A great NAS for those who are looking for an all-in-one solution.

Goes up to 24TB; Easy access to drives; Robust control options

Limited to four bays; Price when fully loaded