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WD My Cloud EX4 Diskless: 4-Bay Personal Cloud Storage WDBWWD0000NBK-NESN

  • Reliable, high-performance, four-bay NAS for your home or small office
  • Easy to manage with a powerful dashboard, LCD display and drive status alerts
  • Award-winning desktop and mobile apps
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Learn more about the Western Digital WDBWWD0000NBK-NESN




Port RJ-45
2 x 10/100/1000M
Port USB
2 x USB3.0


Default/ Max. Memory

Hard Drive Performance

Included HDD Capacity
Diskless System
RAID 0, 1, 5, 10; JBOD, spanning


100-240 VAC 50/60Hz


PC/Mac compatible

Easy drive install and hot swap

Twonky 7.2 DLNA 1.5 & UPnP certified media server

iTunes support

Anywhere access from computers, tablets and smartphones with My Cloud desktop and mobile apps

Dual power and network redundancy

Optimized for WD Red drives with WD's exclusive NASware technology

Reliable, high-performance, four-bay NAS for your home or small office

Diskless enclosure for ultimate flexibility or a populated system that works out of the box

Get up and running quickly with easy drive installation or buy a populated version that works right out of the box

Easy to manage with a powerful dashboard, LCD display and drive status alerts

Award-winning desktop and mobile apps

Industry-leading third-party apps, including aMule and Icecast

Advanced serving options including an integrated file server

Media streaming to connected TVs, media players and other DLNA/UPnP devices

WD SmartWare Pro for PC users, Apple Time Machine compatible for Mac users

Dual USB expansion port to increase storage capacity

Dimensions / Weight

8.67"(L) x 8.21"(H) x 6.30"(W)
7.2 lbs


0°C - 35 °C

Package Contents

Package Contents
My Cloud EX4
Ethernet cable
Power supply and cable
Quick Install Guide

Quick Info


  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years

Customer Reviews of the Western Digital WDBWWD0000NBK-NESN

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  • Dr. S.
  • 1/13/2014 6:26:02 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggs

This review is from: WD My Cloud EX4 Diskless: 4-Bay Personal Cloud Storage WDBWWD0000NBK-NESN

Pros: The price and the software that comes along with it. I used another brand of Hard Drive and they detected just fine. Western Digital has made this unit capable of running without communicating with their servers. It gives a great deal of freedom, which I love. You just have to be willing to spend the time setting it up. This unit also gives you ssh access(as of this writing). I have used this to determine the load and to kill processes and disable certain services. You could use this access to do a lot of other things. iSCSI is nice as well. Even though this unit does have some performance issues. I have had no trouble streaming video from the device.

Cons: Performance. In the next edition hopefully they will upgrade the guts.

Other Thoughts: I am happy with this unit, and with iSCSI you can do a lot. I have created a few virtual drives to house VM's and will probably try and tie a couple of hosts back to this device. For the price this is an interesting unit. I have looked at setting up FreeNAS. I have also looked at some of the other NAS units. The big problem is trying to tie back to your data and this unit does a lot of the hard work for you in that department.

2 out of 2 people found this review helpful. Did you? Yes No

  • Paul W.
  • 12/15/2013 4:19:48 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

1 out of 5 eggsNot Worth It

This review is from: WD My Cloud EX4 Diskless: 4-Bay Personal Cloud Storage WDBWWD0000NBK-NESN

Pros: It's very small and has 4 drive bays.

Cons: I thought this would be good for my small office, but there's too many problems.

1) Moving files to the unit without using iSCSI is insanely slow. (1.5tb = 20 min)
2) Files moved using iSCSI aren't accessible through the cloud.
3) Cloud sharing is moderated through the proprietary WD software or by emailing links through WD,com
4) Cloud access is done via 48-hour, one-time-use keys provided by
5) Built-in multimedia streaming service can only stream MP3 files.
6) XVID encoded .AVI files come up as "corrupt" when accessed on DLNA devices.

So, with employees not being able to access or share files outside the internal network, and since the file transfer to/from the unit is unacceptably slow, and since I can not give this a Zero Star rating, it earns a 1 by default.

Other Thoughts: The #1 problem is that accessing the unit externally through is completely unacceptable.

I could have sworn this was supposed to have a printer sharing ability, but since it doesn't and since the documentation doesn't mention it, I'm probably mistaken.

It would have been nice to get rid of the old file server, but I guess I'm stuck with it for a bit longer.

Manufacturer Response:

Greetings Fumtu,
iSCSI connections use a protocol that creates an image file that must be mounted and authenticated through iSCSI for access to the data. This is actually a method of mounting a target image on a My Cloud network share as a physically connected hard drive on your computer. As the data is managed by iSCSI, it must be accessed via iSCSI.
The included desktop software is not required to access the drive remotely. For remote access to individual files and folders we recommend using the built-in My Cloud remote access via either the provided desktop app, through a web browser, or the phone app. You may also email links to files and folders which allows remote access to individuals for a one-time connection.
The activation code generated through the WD Cloud utility on the user interface of the drive expires after 48 hours if not validated and activated by the remote user. Once the code has been activated on an app or associated with an email, the remote access is granted for that user unless altered by the Admin of the My Cloud.
Please refer to our Learning Center link below for more information.
The My Cloud is DLNA compliant and supports this standard. However, individual file support is dependent on the devices accessing the data via a DLNA media server. Please refer to this link for supported file types and codecs for DLNA streaming with the Twonky Media Server.
As a best practice when moving data to the drive for initial transfers from your source computer, you will want to consider using an Ethernet connection to your router. If wirelessly connected, you may not achieve optimal speeds or sustained bandwidth.
Printer sharing is not currently a feature of the My Cloud device. We appreciate the suggestion as we are always taking our customer’s feedback into consideration for adding product features.
For further assistance, please contact us via phone or email below.

2 out of 16 people found this review helpful. Did you? Yes No

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