The western digital 16tb sentinel dx4000 4 bay nas hard drive is an expandable storage solution which keeps your data safe and sound the sentinel serves data at lightning fast speeds via two gigabit ethernet and two usb 30 connections and is capable of backing up and securely serving files across a network and remotely making it ideal for small businesses and studios or home networks with the option of raid configuration and off site back ups you can ensure that your media collection portf