I had a drive 2 failure that WD determined was covered under warranty. Instead of sending me a new drive, there was some minor concern that the problem might have been the drive interface, so they sent me a whole new unit. That’s fine, except now I have an unexpected problem. I first started up the new unit and got the firmware up to date and made sure everything worked normally. I then took the good drive out of the original unit and placed into the new unit in order to rebuild the RAID on the new new unit. When I started it up, the new unit gave a message like this: “New drive detected in slot 1. RAID will be rebuilt from Drive 2. All data on Drive 1 will be erased.” Well, obviously, that’s not what I wanted. I wanted the exact opposite actually, to rebuild the RAID from Drive 1. Unfortunately, it appears that isn’t an option.