When I rebooted into OTLPE the C: drive disappeared… (not in Explorer nor at the cmd prompt)
So I switched some power cables to make sure I didn’t have a bad “one” and rebooted to OTLPE after the machine showed hard drive as a boot option again.

note: I ran chkdsk earlier (without /r) and it came up with no errors

on 2nd run chkdsk says “replaced bad clusters” on 1 file, ending log shows 4KB in bad sectors

Tried again to boot to c:, hangs up in the same spot.