Upgrade Trashed My Data Volume

Upgrade has turned into a complete disaster.
I have a 3TB drive as a data volume /dev/sdb

After the update the drive wasn't mounted.
From the GUI i see it as not mounted.
When i mount from the GUI i see the 2.69TB Capacity and 1.37TB available which is correct for the data before the upgrade.

However, when i mount the drive it shows the drive as being empty.
if i run gdisk, i see the partition has a different GUID compared to the one under OMV 0.5.60

mount -t auto /dev/sdb1 /media/test - WORKS.

how do i get the correct UUID to update the fstab with?

HELP! please

thanks ryecoaaron, but i managed to restore fstab.old which seems to have been the fstab pre-upgrade and now seems to be working.