Thanks for the help. I've followed the steps you advise with 3 different 2TB drives that are the same and model as the failed drive. When I put in the correct 4 digit code to confirm that I want to rebuild the array and I know all data will be lost on the replacement drive, I get the following error:
"A system error occurred. Reboot the LinkStation and try configuring it again." When I reboot, I get the same error.
If this is indicative of a bad LinkStation LS420D0402 versus a bad drive, how can I check the warranty on mine using the serial number? I don't remember when I purchased it.