First thing first. You always mount a partition and can always mount it "manually" if the partition has a healthy filing system when you are in root.
Say a partition sdb3 is needed by a regular user, these terminal commands should get it done "manually"
supply the root password and you are now in root with Suse
mount /dev/sdb3 /mnt/sdb3
Using /etc/fstab is to mount it automatically.
A partition mounted this way by root can allow a regular user to see its content by command
but it will still protected from viewing in the desktop if the filing system is not owned by the user who mounted it.