Solutions
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TedStriker's post in Changed permissions to root on external USB drive partition, now I cannot access it was marked as the answerBoy, I feel like an idiot... the one thing I didn't try, which is to delete the enclosure's entry in Historical Devices when the enclosure was off and disconnected, then connect it back up, worked just fine when I did it just now. After that, I was able to reformat the enclosure's "drive" and can access it just fine.