05-25-2017, 11:47 PM
anonymouse1 wrote:
I'd connect the drives that won't work to the MBP, and run Disk Utility/Drive Genius/Etc. on them FROM THE MBP. They don't need to be mounted for that.
Did that, now cloning to a fresh disk just in case I wipe and restore. I also used BatchMod to unlock the locked volumes. The contents of one unlocked volume are now showing up and appear to be intact. The main backup drive attached to the Mac Pro has also been unlocked. No contents were showing in the backups folder; but running Data Rescue, even though it didn't copy anything, has caused the disk images to reappear.
An external drive that was connected but not turned on when whatever this is happened appears to be OK and has booted the Mac Pro. Next step, I guess, might be using CCC to restore the last backup to one of the affected drives, to see if it then can boot.