Private Cloud Storage

My Cloud EX4

My Cloud EX4
  • Highlights
  • Features
  • Apps and
    Advanced Features
  • Specifications
  • Reviews and Awards
  • Support
  • Overview
  • Management and
  • Compatibility
  • Advanced Apps
  • Advanced Features
  • Advanced Backup
  • Business-Ready
  • Energy-Saving Features
  • Advanced Serving
  • Reviews

Expandable storage.
Choose the diskless enclosure to add up to four drives and grow as your needs expand. Or, choose a populated system that works right out of the box.

Easy to set up, easy to manage.
Effortlessly install drives or hot swap within five seconds with WD’s advanced, all-metal enclosure design. WD’s powerful dashboard means you are always in control.

Extensive data protection.
You’re armed with multiple options to secure your data from loss. Choose RAID 1, 5, 10 or select from spanning and JBOD modes for even more options to manage your data.

See it in action.
Learn more about the personal cloud and how My Cloud EX4 can help you save everything and access anywhere.
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Your options are endless

Choose the diskless enclosure with easy drive install and hot swap to effortlessly add up to four drives and grow as your needs expand. Or, choose a populated system that works right out of the box, featuring WD Red hard drives for ultimate compatibility in the unique 24x7 NAS operating environment.

High-performance NAS

Dual Ethernet and power supply ports; 512 MB memory and 2.0 GHz processor deliver reliable, blazing-fast performance for your home or small office.

Drive management and data protection at its best

You're armed with multiple options to secure your data from loss. Choose RAID 0, 1, 5, 10 or select from spanning and JBOD modes for even more options to manage your data.

Award-winning desktop and mobile apps

With WD's My Cloud mobile and desktop apps, you can upload, access and share your documents from anywhere. Conveniently transfer files from your public cloud accounts to My Cloud EX4 directly from anywhere with the help of the mobile app.

Easy to manage

A powerful dashboard and LCD display means your system is always under your control. Monitor your drives, manage users and utilize energy-saving features. Email and mobile alerts keep you informed on My Cloud EX4 status.

Powerful apps to customize your NAS

Featuring industry-leading apps, including aMule, Icecast, Joomla!, phpBB, phpMyAdmin and SqueezeCenter.

Stream media to your connected devices

Stream videos and photos to connected TVs, media players, gaming consoles and other DLNA/UPnP devices. Features a Twonky 7.2 and a DLNA-certified 1.5 media server. And with My Cloud EX4's iTunes server, you can easily stream your music collection.

Advanced serving options

Integrated file server, FTP server, backup server and P2P torrent download server.

Back up,
your way

Protect your data with remote backup to another My Cloud EX4, integrated cloud backup or local LAN/WAN backup. PC users, WD SmartWare Pro offers options for how, when and where you back up your files for up to ten computers. Mac users, utilize all the features of Apple Time Machine backup software to protect your data.

Increase your personal cloud capacity

Simply attach a compatible USB hard drive directly to one of the two USB 3.0 expansion ports on My Cloud EX4 and instantly expand your storage capacity.

Integrated energy-saving features

Save money on your energy bill with disk spin-down and scheduled power on/off.

Your own personal cloud

Unlike public clouds, My Cloud EX4 allows you to keep all your content in one safe place on your home or office network instead of a remote server. No mysterious location of your data. No monthly fees. No limits. Just blazing-fast performance for your high-speed digital life.

Advanced features

iSCSI target, full-featured FTP services, link aggregation and failover support, jumbo frame support, iPv6 ready, UPS support (USB and network), real time resource monitor, volume encryption with boot-up password, SNMP and virtual volumes.

Speed (RAID 0)

RAID 0 mode provides disk striping across all drives in the RAID drive group. RAID 0 does not provide data redundancy but does provide the best performance of any RAID levels. RAID 0 breaks up data into smaller segments and stripes the data segments across each drive in the drive group.

Data protection (RAID 1)

Set the system to data protection mode (also known as mirrored mode or RAID 1) and the capacity is divided in half. Half of the capacity is used to store your data and half is used for a duplicate copy. If one drive goes down your data is protected because it's duplicated.

Data protection and speed (RAID 5)

In systems with three or more drives we recommend that you set the system to RAID 5.

This gives you the best of both worlds: fast performance by striping data across all drives; data protection by dedicating a quarter of each drive to fault tolerance leaving three quarters of the system capacity available for data storage.

Very high reliability with high performance
(RAID 10 or RAID 1+0)

RAID 10 delivers very high I/O rates by striping RAID 1 (mirrored) segments. This RAID mode is good for business critical database management solutions that require maximum performance and high fault tolerance. A system set to RAID 10 yields half the total capacity of all the drives in the array.

JBOD & spanning

JBOD is the use of one or more drives not in a RAID configuration but managed as separate logical volumes. Spanning is the combination of drives in a linear fashion to create one large logical volume. The advantage of using this mode is that you can add more drive without having to reformat the system.

Hard Drive Compatibility List
10,000rpm drives are not supported.
Manufacturer Family Model Interface Speed Capacity
WD WD Red WD10EFRX SATA 6Gb/s IntelliPower 1TB
WD WD Red WD20EFRX SATA 6Gb/s IntelliPower 2TB
WD WD Red WD30EFRX SATA 6Gb/s IntelliPower 3TB
WD WD Red WD40EFRX SATA 6Gb/s IntelliPower 4TB
WD WD Blue WD5000AZLX SATA 6Gb/s 7200rpm 500GB
WD WD Blue WD10EZEX SATA 6Gb/s 7200rpm 1TB
WD WD Green WD20EZRX SATA 6Gb/s IntelliPower 2TB
WD WD Green WD30EZRX SATA 6Gb/s IntelliPower 3TB
WD WD Green WD40EZRX SATA 6Gb/s IntelliPower 4TB
WD WD Black WD2002FAEX SATA 6Gb/s 7200rpm 2TB
WD WD Black WD2003FZEX SATA 6Gb/s 7200rpm 2TB
WD WD Black WD3003FZEX SATA 6Gb/s 7200rpm 3TB
WD WD Black WD4003FZEX SATA 6Gb/s 7200rpm 4TB
WD WD Re WD1003FBYX SATA 3Gb/s 7200rpm 1TB
WD WD Re WD2000FYYZ SATA 6Gb/s 7200rpm 2TB
WD WD Re WD3000FYYZ SATA 6Gb/s 7200rpm 3TB
WD WD Re WD4000FYYZ SATA 6Gb/s 7200rpm 4TB
WD WD Se WD4000F9YZ SATA 6Gb/s 7200rpm 4TB
WD WD Purple WD10PURX SATA 6Gb/s 5400rpm 1TB
WD WD Purple WD20PURX SATA 6Gb/s 5400rpm 2TB
WD WD Purple WD30PURX SATA 6Gb/s 5400rpm 3TB
WD WD Purple WD40PURX SATA 6Gb/s 5400rpm 4TB
HGST Deskstar HDS721010CLA332 (0F10383) SATA 3Gb/s 7200rpm 1TB
HGST Deskstar HDS723020BLA642 SATA 3Gb/s 7200rpm 2TB
HGST Deskstar HDS724040ALE640 (0F14681) SATA 6Gb/s 7200rpm 4TB
Toshiba DT01ACA Series DT01ACA100 SATA 6Gb/s 7200rpm 1TB
Toshiba DT01ACA Series DT01ACA200 SATA 6Gb/s 7200rpm 2TB
Toshiba DT01ACA Series DT01ACA300 SATA 6Gb/s 7200rpm 3TB
Seagate Barracuda ST2000DM001 SATA 6Gb/s 7200rpm 2TB
Seagate Barracuda ST3000DM001 SATA 6Gb/s 7200rpm 3TB
Seagate Barracuda ST4000DM000 SATA 6Gb/s 7200rpm 4TB
Seagate NAS HDD ST2000VN000 SATA 6Gb/s 5900rpm 2TB
Seagate NAS HDD ST3000VN000 SATA 6Gb/s 5900rpm 3TB
Seagate NAS HDD ST4000VN000 SATA 6Gb/s 5900rpm 4TB
Uninterruptible Power Supply
Manufacturer Family Model
APC Smart-UPS SMC1000
APC Smart-UPS SMT750
APC Back-UPS Pro BR1500G
CyberPower Smart App LCD UPS OR500LCDRM1U
CyberPower Intelligent LCD UPS CP1500AVRLCD
Tripp Lite Battery Back Up Tower AVR UPS Smart750USB
Tripp Lite Smart USB UPS Smart550USB

Click Model # for Full Specs.

Model #InterfaceCapacityOperating System 
WDBWWD0160KBKGigabit Ethernet x2, USB 3.0 x216 TBWindows/Mac
WDBWWD0120KBKGigabit Ethernet x2, USB 3.0 x212 TBWindows/Mac
WDBWWD0080KBKGigabit Ethernet x2, USB 3.0 x28 TBWindows/Mac
WDBWWD0000NBKGigabit Ethernet x2, USB 3.0 x20 TBWindows/Mac


  • Windows 8.1 or earlier, Windows 7, Windows Vista, Windows XP (SP3) operating system; Mac OS X Mavericks, Mountain Lion, Lion and Snow Leopard operating systems; DLNA/UPnP devices for streaming; Internet connection for remote access.

Package Includes

  • Four-bay personal cloud storage
  • Ethernet cable
  • Power supply and cable
  • Quick Install Guide

Mouse over each icon to see how it was calculated.

Examples of the number of photos, songs, videos and any other files that can be stored on a hard drive are provided for illustrative purposes only. Your results will vary based on file size and format, settings, features, software and other factors.

As used for storage capacity, one megabyte (MB) = one million bytes, one gigabyte (GB) = one billion bytes, and one terabyte (TB) = one trillion bytes. Total accessible capacity varies depending on operating environment. As used for buffer or cache, one megabyte (MB) = 1,048,576 bytes. As used for transfer rate or interface, megabyte per second (MB/s) = one million bytes per second, megabit per second (Mb/s) = one million bits per second, and gigabit per second (Gb/s) = one billion bits per second.

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WDs mobile & desktop app

Access all the content on your personal cloud from any device.

My Cloud mobile app

You are always connected to your personal cloud. Save valuable space on your mobile devices with easy photo and video uploads directly to your personal cloud, then securely access and share your memories from anywhere.

Have a public cloud account?

The My Cloud mobile app also allows you to easily transfer files between your personal cloud, Dropbox and other public cloud accounts.

My Cloud desktop app

This app keeps your PC or Mac connected to your personal cloud, no matter where you are. From the application, you can easily drag and drop to transfer, manage your files and share links to specific files or folders via email.

Third party integrated apps


Free peer-to-peer file sharing application that works with the EDonkey network and the Kad network. The app provides search capability for finding desired P2P files and has a full-featured P2P server/client Web UI interface.


One of the leading bulletin board solutions, including powerful permission systems, private messaging, search functions, a customizable template and language system, as well as support for multiple databases.


Streaming audio server that supports MP3, FLAC, WAV, Ogg, ACC, as well as transcoding. Stream to both hardware and software receivers as well as any media player capable of playing MP3 streams.


WordPress is a free and open source blogging tool and a content management system (CMS) based on PHP and MySQL. Create your own WD My Cloud EX4 based customized Blog that can be accessed and commented on from any internet connection.

Dashboard cloud access

Your system is always under your control. Manage My Cloud EX4 from anywhere with WD's powerful dashboard and LCD display. Monitor your drives, manage users and utilize energy-saving features. Email and mobile alerts keep you informed on My Cloud EX4 status.


Open source media streaming app that can be modified to suit your individual needs.


Content Management System (CMS) that facilitates easy management of your website text, photos, videos, music and documents.


Handles the administration of MySQL via web with ability to create and drop databases; create, drop, or alter tables; delete, edit or add fields; execute any SQL statement and manage keys on fields.


Transmission is one of the best choices for a BitTorrent client, being both extremely lightweight and feature-packed.
Transmission's interface is easy to use, yet very powerful, especially when it comes to managing bandwidth.

Are you a developer that is interested in porting your app to My Cloud EX4?

Interested in developing or porting your app to work with My Cloud EX4? Contact us at to get more details.

My Cloud EX4 comes complete with a full suite of advanced features to power your home or office.

Volume virtualization using iSCSI targets

Manage storage over long distances and transfer data over LANs, WANs or the Internet by creating a Storage Area Network (SAN). My Cloud EX4 allows you to create and manage iSCSI targets, similar to a local hard disk drive, that is accessed over a network rather than locally. The iSCSI target is protected by the underlying RAID structure of the My Cloud EX4 server.

Jumbo frame support

My Cloud EX4 supports jumbo frames up to 9000 bytes. These large IP frames are used to increase performance over supported networks. Increases in data transfer speeds only occur if every device on your network supports jumbo frames.

Link aggregation and failover support

Combine multiple network connections to increase data transfer past a single connection and provide redundancy in the event of a failed connection. This is also known as bonding, and refers to the use of two LAN NICs present in your NAS and two cables connected to your router simultaneously, improving reliability.

iPv6 ready

Supports the latest revision of the Internet Protocol.

UPS support (USB and network)

Provides extra protection from loss of power via USB or network.

USB UPS: A supported UPS device that is connected to My Cloud EX4 via USB cable can detect a power loss and gracefully shut down power. UPS devices that have been tested to work with My Cloud EX4 can be found here.

Network UPS: Network UPS devices can be used when there is a single UPS device and multiple My Cloud EX4 units. One My Cloud EX4 can act as a "Network UPS server" and connect to the UPS device via USB or network (depending on the device). The network UPS server obtains UPS information and relays it to the other “client" My Cloud EX4. Network UPS devices that have been tested to work with My Cloud EX4 can be found here.


Simple Network Management Protocol, a protocol for managing devices on a network, allows My Cloud EX4 to be used in a managed environment. IT administrators who need to monitor multiple network devices, including My Cloud EX4 via SNMP should download the document available here.

Real-time resource monitors

Provide up-to-date information on My Cloud EX4 resources, including CPU percentage, network utilization and RAM usage.

Volume encryption with boot-up password

Prevent unauthorized access to your data by creating a boot-up password for your drives.

Virtual volumes

Simplifies scalability by allowing you to map iSCSI targets on other network storage devices and present them as shares on your My Cloud EX4 device.

My Cloud EX4 provides multiple options to secure your data from loss.


ElephantDrive is a premium cloud-based backup, sync and sharing solution platform. With simple, fast and reliable protection for all of your important files, ElephantDrive is the perfect solution for users at any level. ElephantDrive's software runs on all personal devices (laptops, desktops, smartphones, etc.) as well as natively on NAS devices, where it is the leading solution in the space.

Learn more

Amazon S3

Amazon S3 Backup and Restore feature allows you to back up data directly to your Amazon S3 account. Amazon S3 gives you peace of mind when used as an offsite backup, should anything happen to the data stored on your My Cloud EX4.

Learn more

Back up, your way

Protect your data with remote backup to another My Cloud EX4, integrated cloud backup or local LAN/WAN backup. PC users, WD SmartWare Pro offers options for how, when and where you back up your files for up to ten computers. Mac users, utilize all the features of Apple Time Machine backup software to protect your data.

My Cloud EX4 comes complete with business-ready features for your office.

User management/group management

Give users access to My Cloud EX4. Easily create groups and give individual access to those groups.

User/group quotas

Manage the amount of storage users/groups have access to.

Microsoft Active Directory support (2003/2008/2012)

Take advantage of centralized account management to reduce overhead and IT spending. Add My Cloud EX4 to your Active Directory (AD) server for simplified and centralized management, as well as easy access for employees with one set of domain accounts. Employees can use a single account to access various services with ease.

Distributed File System (DFS)

Connect My Cloud EX4 to a Microsoft server using DFS SMB file shares.

Disk spin-down

Set disk spin-down after as little as 10 minutes, saving runtime energy.



Use WD Quick View to wake My Cloud EX4 without having to physically push a button.

Automatic power recovery

This feature automatically restarts the My Cloud EX4 from an unexpected power-failure shutdown.

Scheduled power on/off

Set your own customized schedule to power on your My Cloud EX4 on a daily basis to save power when not in use.

File server

Serves as a shared space for PC and Mac computer files.

Back up server

The My Cloud EX4 back up server is designed with flexibility in mind. Designate a back up to or from a connected USB drive or internal volumes.

FTP server

Fully featured FTP server to manage the transfer of files from My Cloud EX4 to a client with the following capabilities:

  • FTP bandwidth restriction (upstream/downstream)
  • IP address block (block access from undesired IP address)
  • IP address block time limits
  • Anonymous FTP
  • Secure FTP support
  • Support File eXchange Protocol (FXP)

P2P download server

Utilize popular Peer-2-Peer services to download torrents.

Http download server

The built in HTTP download server allows you to download files directly from the web to
My Cloud EX4.