• Excellent performance
  • Sturdy construction
  • Reasonably priced


  • Needs more USB ports
  • Native GMA 3150 driver not installed
  • No eSATA port

At A Glance

Western Digital provides plenty of value in this entry-level rack-mount NAS, but the device does have a couple of minor flaws.

Manufacturer’s Description

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.

Manufacturer’s Website

Western Digital Sentinel RX4100

The Specs

Installation Kit Hardware


Ethernet Performance - PCWorld
Write 10GB Folder 41.8   MB per second
Read 10GB Folder 53.7   MB per second
Write 10GB File 96.4   MB per second
Read 10GB File 96.5   MB per second