old-school / Can not backup my IMG file / my external HD is always RO not RW !

Hello,

I can not export my HD file (vm-100-disk-0.img) to an external HD :-(

i used "mount -o rw -t ntfs /dev/sdd1 /media/usb"

even "mount -o remount,rw -t ntfs /dev/sdd1 /media/usb" does not works :-(

Any ideas ?