How can I mount an external hard drive via command line

I have an external hard drive that's been formatted as "Mac OS Extended (Journaled)" (the default option from Disk Utility). I'm in single-user mode and want to mount the drive. I noticed that when I plug in the drive to the USB port I get some new items in the /dev/ directory, namely:
disk3, disk3s1, disk3s2, rdisk3, rdisk3s1, rdisk3s2
I imagine I'm only interested in the disk3*, but I'm not sure which one (or what the differences are, there's only 1 partition on the drive).
Also, I'm not sure which mount command to use, there are several in the /sbin/ directory. I tried the "mount" command and got a message that noted: "Incorrect super block." Any ideas?

/usr/sbin/diskutil mount /dev/disk3

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How can I mount an external hard drive via command line

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