I had a very similar issue not too long ago on a 4TB drive.
What happened with mine is it would work fine when booting up my machine, and I could access/run the files. Then at some point I couldn't run the files (could still see them though). I would get the same RAW format crap when trying to chkdsk.
A restart would temporarily fix it, then it would crap out again.
Luckily I had another drive I could transfer everything to in order to format the drive again. Since then it's worked fine.
I can't say for sure, but my gut tells me it was Windows 10 that screwed it up.
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