So I partitioned one of my external HDD's for my bootcamp windows, just so I could install some Windows files without having to resize my partition by erasing it and reinstalling. Using disk utility on the Mac side, I partitioned it to be half Mac OS Extended (Journaled) and the other half ExFAT.
Both drives show perfectly well on my Mac, but when I boot in windows, it only shows my read-only Mac OS Extended partition and when I open the partition display in windows, it says that there is only one partition (unknown) and it is all unallocated.
Also, it already has files on the mac side so I don't really want to reformat if possible.
-- Macbook Pro Late 2013 13" Intel i5 256GB