^
Yea, NTFS works just fine for me. To confirm, first format any USB pendrive in NTFS and try downloading to it. Maybe your HDD didn't get detected because it needed 2 USB connectors? Because even when some people mentioned that the router cannot write to NTFS, it can certainly read from NTFS. So if your HDD didn't get detected at all, then most probably it is because of the 2 USB connectors. Try with a pen drive to confirm.