I accidentally ran...
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diskpart format override /fs=ntfs
However, the problem I'm having with Photorec is that when I attempt to use it to recover the contents of my whole disk, it eventually gets stuck in an infinite loop. The last time I ran it the sector would go up to roughly 357,000,000 and then start again at 209,000,000, and so on. Running a capture program showed me this happened every 2 hours or so, and each time it did the ETA would rise. When I eventually stopped it, Photorec had run for over 100 hours and still was projecting 1000+ remaining.
I'm currently trying the "Partition only" option instead of the full drive, but because of the corruption on my drive I don't have much confidence it will restore all or even most of my files.