Network Storage Servers

WD Sentinel RX4100

WD Sentinel RX4100
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Easy setup and administration.
WD Sentinel RX4100 includes the hardware and software needed to centralize your business files. Once it’s set up, administration is easy because it intelligently manages drive and network status, reducing maintenance time so you can focus on your business.

Unified storage solution.
WD Sentinel RX4100 is a highly affordable and reliable integrated Network Attached Storage, iSCSI SAN and backup server in a 1U rack mount enclosure, thus reducing hardware requirements and providing lower cost of ownership for small to medium-sized businesses.

Complete data protection for your business.
WD Sentinel includes Windows Storage Server 2008 R2 Essentials software, providing enterprise-class data protection for up to 25 client computers in your network. There's no need to purchase additional backup software licenses.

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Learn how

Easy installation

The easy setup process allows you to integrate WD Sentinel RX4100 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 administration

WD Sentinel RX4100 is the ideal rack mount storage server for small businesses. Its easy administration features include four drive bays with hot swappable design; redundant user-serviceable power supplies; user-serviceable fans and email alerts. In the event that an IT professional’s assistance is needed, the WD Sentinel RX4100 allows them to manage the server remotely. Now that’s easy!

Virtualize WD Sentinel storage using iSCSI Target

WD Sentinel RX4100 offers built-in iSCSI target functionality integrated within the Dashboard to easily manage the setup, administration and deployment of iSCSI SAN Storage. IT Pros and advanced users have the ability to partition their WD Sentinel RX4100 for both NAS File-based storage as well as iSCSI-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.

Real-time system status through the administration Dashboard or email alerts

Receive critical system updates via the built-in email alerts functionality or view real-time updates for the system and network status through
WD Sentinel’s Dashboard. The Dashboard includes easy-to-use task wizards that allow you to perform administrative tasks such as creating and managing user accounts, setting backup schedules and access privileges to shared folders, and monitoring the WD Sentinel's system health and alerts. The Dashboard's "Health" tab allows you to monitor the status of the storage drives, RAID configuration and power supplies, as well as temperatures, fans, CPU and network connections.

Protecting your data is critical to the long-term success of your business because recreating lost data can take hundreds of hours and cost thousands of dollars. WD Sentinel RX4100 offers a complete data protection solution and helps safeguard your business against data loss.

The drives inside

Pre-configured with four hard drives optimized for reliability, quality and performance.


Automatic backup and restore for Windows clients

The included backup software saves time and space by performing a full Bare Metal Backup the first time and then automatically backing up only the data that has changed since the previous backup, using block-level deduplication technology. In the event of a data loss or a drive failure on a client computer, the WD Sentinel RX4100’s fast and easy restore function finds your files or lets you restore an entire system to get you up and running again quickly.

Performance and data protection with RAID

Pre-configured with RAID 5 for added data protection and drive redundancy.

Learn more

Dual Ethernet ports

Comes configured in Adaptive Fault Tolerance, which keeps your network available by automatically switching to the second Ethernet port if the first one should fail.

Optional dual power supply

WD Sentinel RX4100 offers the small business owner the option of adding an external power supply that will take over should a power surge or other failure damage the internal power supply. With the optional external power supply you have the added peace of mind knowing that your server will remain operational.

Easy data retention policy implementation for Windows clients

Implement your company’s data retention policy with ease to ensure regulatory compliance.


Optional off-site disaster recovery service*

Every small business should have a plan to protect its data from an unforeseen disaster (fire, flood, earthquake, etc.). KeepVault is an off-site, cloud-based data backup and disaster recovery solution that’s integrated within WD Sentinel RX4100’s administration dashboard. It’s easy to use and cost-effective and provides built-in support for data encryption and compression for secure and faster data transfer.

* Pre-installed in US-only SKUs

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Secure remote access

WD Sentinel RX4100 is perfect for businesses with employees working remotely or in home offices. You have the security of knowing all your business files are safely stored on your WD Sentinel RX4100 small business storage server. With built-in secure remote access, remote employees with access permissions can securely access business data from any computer with an Internet connection.

Fully compatible with Mac OS clients

WD Sentinel RX4100 supports Apple Filing Protocol (AFP), which provides complete compatibility for Mac OS-based client machines. Discover WD Sentinel RX4100 automatically using Bonjour, seamlessly back up your Mac OS clients using Apple’s Time Machine backup utility, enjoy faster data transfer over Ethernet using AFP, and manage your WD Sentinel RX4100 server using the Administration Dashboard application for Mac.

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 business environments. WD Sentinel RX4100 features:

Best-in-class hard drives – Equipped with hard drives (2 TB, 3 TB, and 4 TB) that feature high-capacity storage, peak performance and best-in-class reliability.

Intel Atom processor – Built with an Intel Atom dual-core processor inside, WD Sentinel RX4100 can easily handle your small business’s day-to-day computing and file storage demands.

Windows Storage Server 2008 R2 Essentials – Microsoft Windows Storage Server 2008 R2 Essentials operating system provides 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. With enterprise-class, server-based, block-level de-dupe backup capability you can be confident that your data is well protected.

Leading-edge performance

With dual Gigabit Ethernet connectivity, WD Sentinel RX4100 delivers read speeds up to 105 MB/s through the Gigabit Ethernet interface. That's three times faster than most network drives in this category today.

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 Linux/UNIX operating systems.

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 within the 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 warranty for two additional years, for a total of a five year limited warranty.

  • Must be purchased and activated while your WD Sentinel product is still within its three year standard limited warranty period
  • WD Guardian Extended Care cannot be renewed for the same
    WD Sentinel product

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

Click Model # for Full Specs.

Model #InterfaceCapacityOperating System 
WDBLVH0160KBKGigabit Ethernet x2, USB 3.0 x216 TBWindows/Mac
WDBLVH0120KBKGigabit Ethernet x2, USB 3.0 x212 TBWindows/Mac
WDBLVH0080KBKGigabit Ethernet x2, USB 3.0 x28 TBWindows/Mac

Supported Client Operating Systems

  • Windows 8, all 32-bit and 64-bit platforms
  • Windows 7, all 32-bit and 64-bit platforms
  • Windows Vista with service pack 2, all 32-bit and 64-bit platforms
  • Windows XP with service pack 3, 32-bit versions only
  • Mac OS X Mountain Lion, Mac OS X Lion, Mac OS X Leopard and Mac OS X Snow Leopard*
    * You may need to update the system with the latest MS and WD updates.
  • File sharing support for Linux and UNIX


  • High performance (10/100/1000) Gigabit Ethernet connection
  • 2 ports of powered USB 3.0
  • 1 port of powered USB 2.0
  • Intel Atom Dual Core 1.80 Ghz
Operating System
  • Windows Storage Server 2008 R2 Essentials
Supported Web Browsers
  • Internet Explorer
  • Apple Safari
  • Mozilla Firefox
  • Google Chrome
Network Authentication
  • Active Directory join
Network protocols
File Sharing Protocols
RAID Levels
  • Automatic migration and capacity expansion

Package Contents

  • Small Business Storage Server
  • 1 RJ45 Ethernet cable
  • 1.8 meter power cord
  • Basic Install Guide

United States
PC World (Online)
WD Sentinel RX4100 review: A rack-mount NAS every SMB should consider

Most businesses—whether organically or by design—expand to multiple workgroups and branch offices as the organization grows and evolves. It’s a challenge for these different groups and offices to access and share data, and choosing the right storage solution without adversely impacting the entire company can be a daunting and confusing decision.
Traditionally, the task of managing data across workgroups and remote offices has been the domain of large corporations. However, companies of all sizes benefit from utilizing workgroups focused on common business goals. And forward-thinking companies are keen to take advantage of the opportunities provided by branches located closer to bedroom communities and pools of talented people.
The explosion of data, the dramatic rise in file sizes, and the need to access data from anywhere at any time via mobile devices create five unique trends for managing data storage for workgroups and branch offices.

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