O NTFS não suporta permissões de arquivo da mesma forma que o Linux, conforme explicado na ntfs-3g
FAQ :
Why have chmod and chown no effect? [sic]
By default files on NTFS are owned by root with full access to everyone. To get standard per-file protection you should mount with the “permissions” option. Moreover, if you want the permissions to be interoperable with a specific Windows configuration, you have to map the users.
Portanto, modifique seu /etc/fstab
com as opções apropriadas: (alterei default_permissions
para permissions
):
/dev/sda4 /media/DATA ntfs rw,nosuid,nodev,allow_other,permissions,blksize=4096
ou desmonte e remonte manualmente:
sudo umount /media/DATA
sudo mount -t ntfs -o rw,nosuid,nodev,relatime,permissions /dev/sda4 /media/DATA
Agora você deve poder alterar as permissões normalmente com sudo chmod
.