Could you (or someone) explain how to do this to a Windows user? I'm sufficiently tech savvy but not *nix savvy and couldn't follow the discussion above. I'm having the same problem as OP but OP's solution doesn't work for me, so I want to try installing the ntfs-3g driver (AC3100, 5TB drive)@Hale_JP
As I already had Entware installed on my router I thought I'd install ntfs-3g and give it a try. Much to my surprise it actually worked (in that I could mount an NTFS drive using the fuseblk driver)! I can't say whether it will work for you or solve your problem because I have no way of testing that and my hardware/firmware is completely different to yours. Good luck.