Currently in Disk Utility, in the left column under External, the drive shows up with 640.8 MBUsed and 80.58 GB free. There is also a second item under External called disk1s2, but it is grayed out. When I click Erase, rename, format Mac OS Extended (Journaled), it works, but still only shows 800.59 GB of free space. The remainder of the 3T is still partitioned out and not accessible.
So, then I go to Partition, select that 2.2 TB free space, click the – button to delete that partition, click Apply, click Partition and get: “Running operation 1 of 1: Remove “–“… An internal error has occurred and the disk for one of the specified operations could not be found. This may be a temporary issue, try again. Operation failed…” This has consistently been the same error message with the exception of one time when it ran successfully until operation 8 or 9 and then failed.
Thank you so much for your help!