I recently purchased a used WD MyBook World II 1TB (2x500GB) Box on eBay. I have an identical one that is full and needed another for more storage space. Shortly after it arrived I tried to boot without any success, and an examination led me to the discover that the box was bricked. I had unwittingly been ripped off by a savvy eBay seller looking to dump a junk box and save a few bucks in the process. It was going to be a major pain to get this guy to take a return and refund my cash, so I set to work on the other options.
The box I already have is running 'raid-1' mode, and I got the idea that it might be possible to swap one of the good raid volumes into the bricked box, boot it, and resynchronize the bad drive. This is what I did, and it worked perfectly. The only drawback is that it takes about five hours to resync a 500GB volume, but that's better than trashing the entire box. Right?
After the resync completed, I deleted the old, duplicate files from the new box, and started adding new. The best thing about this is I don't need to rework the new box with all the modifications from the first. I just changed the IP address, and everything is identical to the first box.
So, this might work for you too, or as a safety precaution, resync a spare drive as a backup. In the event that your box gets bricked for software reasons, slide the spare, backup drive in, boot, resync the bad drives, and you're ready for another round of experimentation. You'll need a compatible drive or a second, identical box, and the boxes must run in 'raid-1' mode.
Let me know if anyone else has any success with this.