Yes, moving, as I can, from UCB to Thunderbolt. Thanks for the analyses and for all the help!

No, I haven't done the update yet. I choose to do them manually and tend to wait a bit just in case there are issues. Okay, so it's complex. I had t...

The problem with removing the drive was simple -- the volume was still mounted. I was able to remove it after unmounting the volume. I'm including t...

Thanks for that. It's clear you guys take what you do very seriously and put in tremendous effort, and it's much appreciated. I have what may b...

So it turns out two of the drives were bad—I had to certify all four to find that out. To be on the safe side, I copied off the data, broke the raid, ...

It was the volume directory. I ran DiskWarrior and it repaired the directory, and it mounted. Actually, the directory was so damaged that there were ...