Let's say I
mount /dev/sda3 /var
and this entry is not in
/dev/sda3 is an unused partition (no entries in the fstab), if I delete it I will not lose any data, correct?
mount /dev/sda3 /var, however this time
/dev/sda3 has a mount point at
/etc/fstab - currently not mounted. If I umount /var, and now delete
/dev/sda3 - noting that it is NOT mounted currently will I lose the data on /usr?