@stephenw10
FYI update: I was able to solve my issue of an unrecognizable filesystem error/partition. I put the drive in an enclosure and connected it to Windows, then used diskpart to "clean" the drive, which removed all partitions. Then, I was able to reinstall pfSense using recovery. now, I can see my disk from the GUI, and it seems to be running well.
I hope this helps someone else.
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