Okay, so type the IP address assigned to the NAS in a browser to access the settings page. Or, as you have stated, through NASNavigator 2 right click on the drive icon and select "Open Web Settings"
Helpful tips:
default username and password (if a password has never been setup)
Username: admin
Password: password
Now that I'm in the settings page I can see that DISK 1 is bad (well there's a error with DISK 1).
However when I take apart the NAS unit nothing is marked that I can see indicating which disk is DISK 1 and which is DISK 2.
I'd guess that the disk on the left is DISK 1 and the disk on the right is DISK 2.
The user manual as found through the Settings Page is fairly general and is written for 4 or 5 different models and I don't see anything in the manual identifying the physical location of DISK 1 or DISK 2.
At this point I could just buy a replacement hard drive and randomly replace one of the two while crossing my fingers, but I was hoping for something a little more solid.
Should I take the red pill or the blue pill?