USB booting :: 1 gigabyte usb drive (how to install dsl on it?)

i booted DSL from cd now, and i know where i can find the >install linux to pendrive< thingy... and i know that i need the usb hdd, but how the hack should i know either its sda1 or sda2 or sda3 or whatever...?

help please?:P

boot dsl (don't plug in your usb pen yet)
open emelfm filemanager
enter /mnt into one of the text boxes
you will find a list of mountpoints
plug in you usb pen and wait 20 secs
you will find a new mount point appears
that is your usb pen

original here.