I think the easiest way for you would probably be to automount the ntfs data partition you have labelled Donnees at boot by editing your /etc/fstab file.
Firstly back up fstab with
then edit it with
sudo cp /etc/fstab /etc/fstabbackup
and add the line
kdesu kwrite /etc/fstab
The kde text editor may have changed since I last used it so use whatever you now use instead of kwrite in that command.
UUID=F2F09B1BF09AE55F /media/Donnees/ ntfs-3g auto,user,rw 0 0
Check all is well with command which should give no output if no errors occur.
If all this works properly we can then see if it's worth removing the Donnees_ folder from /media.