David, I don’t know if this will help. This is how I successfully moved from a 2TB to a 5 TB drive. 2 TB to 5 TB; wish me luck: Success with gparted
You can run Gparted from a Live Linux Distro, such as Ubunu. You can also do a lot of damage running gparted from a live distro. You should check the SMART status of the drive as well prior to trying to “fixing” the partition and formatting. I don’t know about that next step of migrating data off a Windows file system back to the Tablo. Let us know how it goes.
You can install GSmartControl onto the live Linux, if you need.
from a terminal (right click the desktop to open a terminal)
$ sudo echo “deb http://us.archive.ubuntu.com/ubuntu xenial universe” | sudo tee -a /etc/apt/sources.list
$ sudo apt-get update
$ sudo apt-get install gsmartcontrol