I have a 300 GB Seagate USB drive that I wanted to use for backups. So I formatted it as ext2. So now I need to mount it manually. I added to /etc/fstab:

/dev/sdd1 /mnt/usb ext2 users,rw,noauto 0 0

and then made it usable with the commands:

chmod ugo+rwx /mnt/usb

chmod o+t /mnt/usb