One evening we had a momentary power outage, causing sudden shutdown for my Mac mini and the attached Drobo (4 bay). When the system came back up, only one of the two volumes mounted on the desktop. The primary 2 TB volume is of course the one that didn't come up. But the Drobo shows no errors or problems with the unit.
Disk First Aid, er... I mean Disk Utility can see that there's supposed to be a volume there (HFS+/Journaled) but cannot mount it. Using the Repair function leaves me with two error messages after 3 hours: "Incorrect Number of Thread Records" and "Invalid Node Structure". Running
fsck_hfs -ypr on the drive gives the same message as Disk Utility.
Disk Warrior wouldn't touch the volumes, but Data Rescue 3 trial version can see it and has also recovered a file from it.
Can I safely recover the files from the first volume into the second volume on the same Drobo?