I've got a 32 GB Verbatim Store-n-Go USB flash drive installed in it right now. It is formatted NTFS.
On Windows 8.1 File Explorer it says 7.85 MB free of 8.0 MB
However, when I go into the indivdual folders I see the Videos folder as 3.19 GB and Documents folder as 653 MB both of which are the correct sizes.
Just playing around with this before buying an external drive.