After doing some searching, came across this Wiki entry on the UnRAID site.

A step by step instruction on what to do is found on the UnRAID forum in this thread. Look at post #3.

The recovered data is in the lost+found folder. To access it you’ll need to telnet to the unraid machine, and look in /mnt/diskX (diskX is the drive that you are recovering from) and there will be a lost+found folder. I moved it to a user share, so I can sort through it from the network.