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Whether you’re an IT expert or not, WD Sentinel is easy to install and provides secure centralized storage, complete data protection and remote file access for your employees and trusted vendors in the office or from anywhere.

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£ 450.55 incl. VAT
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Easy to set up. Easy to manage.

Simple setup. WD Sentinel comes with everything you need to centralize your business files. Once it’s set up, it intelligently manages drive and network status, reducing maintenance time so you can focus on your business.

Enterprise-class data protection for your small business.

Built on proven technologies from industry leaders, WD Sentinel small office storage server offers your business a complete data protection solution for your peace of mind.

Backup software licenses included.

WD Sentinel includes Windows® Storage Server 2008 R2 Essentials software to protect up to 25 client computers in your network. There's no need to purchase additional backup software licenses.



Plug-and-play installation

The easy set up process allows you to integrate WD Sentinel into your office network like a pro. The administration Dashboard quickly guides you through the process including adding users, setting up data access, creating shared folders and scheduling backups.


Easy maintenance

Adding or replacing one of the pre-installed drives is as easy as changing a light bulb. Just open the door and swap out the drives and WD Sentinel does the rest. It seamlessly migrates the server to the appropriate RAID level and automatically expands the server’s storage capacity. Your users can still access your business data while the drive is being integrated. No data loss. No down time.


Secure remote access

WD Sentinel is perfect for businesses with employees working in satellite or home offices because you have the security of knowing all your business files are safely stored in one place and remote empolyees can access them from any computer with an Internet connection. WD Sentinel also performs automatic daily backups so all of the files on all the computers in your network are backed up and protected.

Realtime system status through the administration Dashboard

View realtime updates for drive, RAID and network status through WD Sentinel's Dashboard, which includes easy-to-use task wizards to help you set backup schedules, administer user accounts and manage public and private shares.

LCD display panel readily offers critical information

The LCD display panel on the front of the device allows you to monitor the system status and critical alerts.


A total solution with industry-leading technology partners.

We combined hardware and software from industry leaders to deliver a reliable, secure and easy-to-manage storage server designed specifically for small office environments. WD Sentinel features:

WD enterprise-class hard drives – Equipped with WD's Enterprise-Class WD RE drives that feature high capacity storage, peak performance and reliability.

Intel® Atom® processor - Built with the latest Intel Atom dual core processor inside, WD Sentinel DX4000 can easily handle your small business's day-to-day computing and file storage demands.
Windows® Storage Server 2008 R2 Essentials – WD Sentinel DX4000 uses the tested Microsoft Windows Storage Server 2008 R2 Essentials operating system to provide the cost-effective, reliable and scalable storage solution your small business needs to quickly and efficiently organize, protect and share your critical business data using the familiar Windows user experience.

Virtualize WD Sentinel storage using iSCSI Target.

WD Sentinel DX4000 now supports iSCSI Target. The new Dashboard add-in is designed to easily manage the setup, administration and deployment of iSCSI storage capabilities. When using the iSCSI Target UI within the administration Dashboard and the built-in security of WD Sentinel, IT Pro's and advanced users have the ability to partition their WD Sentinel for both NAS, file-based storage as well as IP-SAN, with the iSCSI Target solution powered by StarWind®. This capability enables the administrator to create multiple iSCSI targets to meet the specific needs of their dynamic IT environments.

Stream digital media anywhere in your network

With the built-in DLNA media server your employees can access any shared media libraries on the network rather than maintaining copies on their individual computers. You can also stream digital content like videos, music or digital signage for employees, vendors or clients using remote web access.

Leading-edge performance

With dual Gigabit Ethernet connecitivity, WD Sentinel DX4000 delivers read speeds up to 85 MB/s through the Gigabit Ethernet interface. That's three times faster than most network drives in this category today. For maximum flexibility there are also 2 SuperSpeed USB 3.0 ports that allow you to connect additional storage devices and experience up to 5Gb/s transfer rates.

Compatible with multiple operating systems

WD Sentinel includes the Connector software for Windows XP, Windows Vista®, Windows 7, Mac OS® X Mountain Lion, Mac OS X Lion, Mac OS X Leopard and Mac OS Snow Leopard. Support for major network file-system protocols enables cross-platform compatibility and file sharing among Windows, Mac and Unix/Linux operating systems.


Complete support for Mac OS

WD Sentinel now supports Apple® File Protocol (AFP), which provides complete support for Mac OS client machines. Now you can utilize Bonjour® to automatically connect devices such as computers and printers to your network or you can seamlessly back up your Mac using Apple's Time Machine® backup utility. Using AFP you can also enjoy faster data transfer over Ethernet and manage your WD Sentinel server using the Administration Dashboard capability for Mac.


2TB Expansion Kit
WD Sentinel Ethernet Cable
£ 8.41 incl. VAT
Out Of Stock
Power Supplies
90W Power Adapter
£ 50.05 incl. VAT
Product Specifications
InterfaceGigabit Ethernet x2, USB 3.0 x2
Physical Specifications
Capacity4 TB
Physical Dimensions
Height8.1 Inches
Depth8.80 Inches
Width6.30 Inches
Weight10.76 Pounds
Height206 mm
Depth224 mm
Width160.0 mm
Weight4.88 kg
Environmental Specifications
Temperature (English)
Operating41° F to 95° F
Non-operating-40° F to 149° F
Temperature (Metric)
Operating5° C to 35° C
Non-operating-40° C to 65° C
Electrical Specifications
Current Requirements
Power Dissipation
AC Input Voltage100-240 VAC
AC Input Frequency50-60 Hz

System Requirements
  • Internet connection (for system updates and web access)
  • Wired or wireless router with an available 10/100/1000 Ethernet port

  • 2 Gigabit Ethernet ports
  • 2 USB 3.0 ports

  • Intel AtomTM D525 1.8 GHz Dual Core
  • 2 GB RAM

Server Operating System
  • Windows Storage Server 2008 R2 Essentials

Supported Client Operating Systems
  • Windows XP with service pack 3, 32-bit versions only
  • Windows Vista with service pack 2, all 32-bit and 64-bit platforms
  • Windows 7, all 32-bit and 64-bit platforms
  • Mac OS® X Leopard, Mac OS® Snow Leopard and Mac OS® X Lion*
  • File sharing support for Linux and Unix
    *May require updating your system with latest MS and WD updates.

Supported Web Browsers
  • Internet Explorer
  • Mozilla Firefox
  • Google Chrome

Network Authentication
  • Active Directory

Network protocols

File Sharing Protocols

RAID Levels
  • RAID 1 (2 drives only) and RAID 5 (3-4 drives)
  • Automatic migration and capacity expansion
Package Contents
  • Small Office Storage Server
  • 1 RJ45 Ethernet cable
  • AC Adapter with power cord
  • Quick Install Guide
WD Guardian Services
WD Guardian Services

Western Digital offers standard customer support and warranty to all WD Sentinel owners. WD Guardian Services provide additional support and warranty options for small business customers.

Choose from the following technical support plans and extended warranty services that work best for your business.

Support level



Standard Support

  • Free 30-day technical support, from the time of your first call.
    Available with standard 3-year limited warranty period.
  • Standard RMA services1
  • Advance replacement options1
  • Rapid hardware replacement for additional cost1

WD Guardian Express

  • Includes the standard support
  • Hardware support and express parts replacement for the duration of the plan2
  • Choose either a 1-year or a 3-year plan with an option to renew
  • Must be activated within 30 days from the date of purchase

WD Guardian Pro

  • Business hours technical support for the duration of the plan3
  • Hardware support and express parts replacement2 for the duration
    of the plan
  • Priority access to technical support through a dedicated support line
  • Choose either a 1-year or a 3-year plan with an option to renew
  • Must be activated within 30 days from the date of purchase

Warranty options4
Standard warranty

3-year limited warranty covers the enclosure, drives shipped at purchase and the power adapter.


WD Guardian Extended Care

Extends the standard warranty for an additional 2 years for a total of 5 years warranty.

1For more information about Standard RMA Services, Advance Replacement Options and Rapid Hardware Replacement, as well as turnaround times for your region, please visit

2WD pays for shipping to customer site. Customer pays shipping of the old part back to WD. Next business day parts replacement is only available in North America, Monday through Friday, when calls are placed before noon Pacific Time. Turnaround time may vary based on time of call and the region.

3To obtain support phone numbers and hours in your region, please visit

4Visit for complete warranty and extended warranty details.

For turnaround times for parts replacement in other regions please visit

Reviews and Awards
06-20-2012Techware Labs
Western Digital Sentinel DX4000
03-23-2012MSN Canada
Western Digital Sentinel DX4000: An Easy-to-Configure NAS Box
06-20-2012Techware Labs
Western Digital Sentinel DX4000
03-23-2012MSN Canada
Western Digital Sentinel DX4000: An Easy-to-Configure NAS Box
01-03-2012Small Business Computing
Small Business NAS Review: WD Sentinel DX4000
12-17-2011Storage Review
Western Digital Sentinel DX4000 Review
12-07-2011Small Net Builder
Western Digital DX4000 Sentinel Reviewed
12-06-2011Using Windows Home Server
Six Minute and Six Second Review of the WD Sentinel DX4000
11-14-2011Storage Review
Western Digital Sentinel DX4000 First Look Review(8TB)
11-14-2011Small Net Builder
New To The Charts: WD DX4000 Sentinel
06-20-2012Techware Labs
Western Digital Sentinel DX4000
03-23-2012MSN Canada
Western Digital Sentinel DX4000: An Easy-to-Configure NAS Box
06-20-2012Techware Labs
Western Digital Sentinel DX4000
05-01-2012PC World
Network-Attached Storage: Today's Best Boxes
03-27-2012PC World
Western Digital Sentinel DX4000 4TB
03-23-2012MSN Canada
Western Digital Sentinel DX4000: An Easy-to-Configure NAS Box
Editors Choice Award
01-03-2012Small Business Computing
Small Business NAS Review: WD Sentinel DX4000
12-17-2011Storage Review
Western Digital Sentinel DX4000 Review
12-06-2011Using Windows Home Server
Six Minute and Six Second Review of the WD Sentinel DX4000

WD Sentinel Recommended Product Award

Editors Choice Award

Western Digital Sentinel DX4000 Review

Case Studies
Case Studies Testimonials

Education Office Gets Smart
about Backup

Napa County Office of Education backs up all email boxes with Western Digital's WD Sentinel small office storage server; reduces storage costs and speeds up PC support with remote Web access.


Basketball Team Scores More Time to Win Games
Western Digital’s small office storage server helps Santa Clara University’s basketball program streamline video management and reclaim valuable coaching time.


Law Firm Restores PCs in Two Hours vs. Two Days
Dibble & Miller uses WD Sentinel small office storage server to back up PCs and cut PC-restore time from two days to two hours. The firm now has enterprise-grade backup at a small-business price.


A Good Investment: A Private Business Cloud Solution
Investment firm gains automatic computer backup, remote data access and plenty of growing room with WD Sentinel DX4000 small office storage server powered by the Intel Atom processor.





What channel partners are saying

“I love this little black box. The form factor is great, and the redundant NICs and PSUs go a long way to alleviating my issues with proprietary components I can’t easily replace myself.”
Sam Wood
Director,  Tentacle Software Limited

“WD Sentinel has been PERFECT for storing raw video footage and for storing all the client backups. I love it. I use it for 2 things. It is domain joined and backs up most of our workstations, and will be backing up a new Windows MultiPoint Server… I also use it as a secondary storage point for archived video footage.
Dana Epp
CEO, Scorpion Software

“The size, tool less ease of service, and the dual/redundant power supplies and network connections make this a real work horse for a small office storage server.   The LCD screen is also very handy to check the status of the unit. It’s been running great for me."
Kevin Royalty
Managing Partner, Total Care Computing Consulting, LLC

What end users are saying

“We don’t have many catastrophic PC failures, but in a small business without a full-time IT staff, any failure is catastrophic. With WD Sentinel, we can restore a PC in two hours rather than two days.”
Dave Nickason
Legal Administrator, Dibble & Miller

“With WD Sentinel on our team, it’s like having a personal assistant who always has everything we need.”
Adam Bauman
Video Coordinator, Basketball Program, Santa Clara University

“WD Sentinel gives us plenty of room to store tons of email at a very reasonable cost. It also potentially saves the Napa County Office of Education millions of dollars in legal liability by enabling us to back up 100 percent of our email boxes.”
Brian Dake
Director of Information Technology, Napa County Office of Education

“WD Sentinel Dashboard is really easy to use, and connecting our PCs to the server was a piece of cake. It has become our file server, backup solution and remote access solution, all in one.”
David Lii
Assistant Portfolio Manager, Saratoga Research Investment Management

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