ricardo@seika:~$ sudo mkdir -p /media/momo
ricardo@seika:~$ sudo mount -t ntfs -o nls=utf8,umask=0222 /dev/sda1 /media/momoMount is denied because the NTFS volume is already exclusively opened.
The volume may be already mounted, or another software may use it which
could be identified for example by the help of the 'fuser' command.