ubuntu@ubuntu:~$ sudo chmod -R ugo+rwx /media/usbdisk
chmod: changing permissions of `/media/usbdisk': Read-only file system
chmod: changing permissions of `/media/usbdisk/System Volume Information': Read-only file system
chmod: changing permissions of `/media/usbdisk/System Volume Information/MountPointManagerRemoteDatabase': Read-only file system
ubuntu@ubuntu:~$