I have a desktop with three drives in it. They display as "320Gb Hard Disk/21Gb Filesystem", "320Gb Hard Disk/297Gb Filesystem", and "File System". I am aware that I booting Ubuntu from the drive "File System" and that the other two are auxiliary storage.

I want to setup a backup process using rsync to backup my home directory to the "297Gb Filesystem", but I don't know how to express the destination drive in "full directory path" terms, i.e., sda/sdb or whatever. What is a CLI command that I can use to make this determination? [I presume that rsync doesn't have a GUI and will be run from the command line].