I used this command: sudo sh -c "echo UUID=`diskutil info /Volumes/WD\ SmartWare/ | grep 'UUID' | awk '{print $NF}'` none hfs rw,noauto 0 0 >> /etc/fstab"

as that is what I found on the internet. And it worked well untill I restarted and now it doesnt show up. When I plug it in to my MBP it works fine... So how do I undo:

sudo sh -c "echo UUID=`diskutil info /Volumes/WD\ SmartWare/ | grep 'UUID' | awk '{print $NF}'` none hfs rw,noauto 0 0 >> /etc/fstab"