Oh, forgot... The documentation says to use the logical path to the
drive, I prefer to use the Ubuntu setup default of UUID, which you'll
see as the Drives serial number where it lists the drives properties.
This way if you add or remove a partition and Ubuntu changes the path to
your files in /dev (say from /dev/sda1 to /dev/sda2) or in the case of
USB external drives, the mount order can be dynamic meaning it could
change from /dev/sdb to /dev/sdc. The UUID allows the OS to find the
specific partition on the drive and mount it.