Reformating a 3 GB USB drive into just one partition

I once tried to plug a 3TB hard drive into my 2008 iMac to discover it wouldn't recognize anything over 2TB. So, I upgraded to 10.8.5.  But evidently, when I originally tried to format the drive, I accidentally created 2 partitions.  When I plug the device in, I now have "2 hard drives" - one 2.2 TB and one about 800 GB.  I want to reformat these "two" drives into one usable 3TB drive.
Any suggestions?

Niel,
The problem is, I'm not sure how to do that.  When I turn on the drive, it appears as "Untitled" and "Untitled 1" - as though they were two drives.
When Disk Utility recognizes them, they are listed as such with the respective size of the partitions (801.57 GB & 2.2 TB) above them in the list.
When I highlight one of the partition sizes (say, the 801.57 one), I DO now see the Partition tab.  However, I don't see where I can merely "delete" it.  It tells me that to erase and partition the selected disk, I must choose a layout from the Partition Layout pop-up menu.
There is also an option to "drag" one corner of the partition layout to where it's only 53.59 GB, changing, but not completely erasing the partition.
What am I missing here?
C-Pup

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