USB booting :: 4gb usb pen drive- how to best use it

I have a 4gb pen drive that I want to install dsl on to. The problem is that the usb-zip install makes one partition and installs the boot and root on that one partition. I would like to install the boot on one partition and use the rest of the drive as the root.

Can someone kind of walk me through how I would do this?

BTW, when I try to fdisk my drive if I select all of the space it comes out to 1000gb for some weird reason so I want to manualy partition it.

original here.