ntfs issue with rsync: read errors mapping permission denied (13)

I have an issue when I want to rsync folders from my external backup hard disk to my NAS. I get this error : > read errors mapping permission denied (13) I have root rights; if I want to change the user's right via chmod, nothing changes. With Windows, the owner is changed but the copy doesn't work. S.M.A.R.T tests is OK. The ntfsfix tests provide no error. I tried to made an chdisk from windows with no results. Do you have any idea for repair or a tricks to recover my files ?