openSUSE 13.2 64bit KDE 4.14.9

Could someone please explain why this does not work? Attributes did not change.

Code:
# mount /dev/sdb1 /mnt/usb
# ls -l /mnt/usb
total 1
-rwxrwxrwx 1 root root 13 Sep 14 15:34 x.txt
# chmod a-w /mnt/usb/x.txt
# ls -l /mnt/usb
total 1
-rwxrwxrwx 1 root root 13 Sep 14 15:34 x.txt
#
Is there a way to set attributes on an NTFS formatted USB stick partition so that Windows users must be logged in as Administrator to write to it?

Thanks in advance.