Ok, let me try to answer as best I can. Yes, I have Linux install on an 8gb usb stick.
My computer seems to be working ok now on the first install I did since it uses the first password for the login. After I told it to use MATE for the sessions it seems to be ok. However, when I explore my computer it does tell me that I have a 'file', 'partition', 'folder'...something which uses the same icon as an external usb or hd card which says 31mb and when I click on it to look at what's on it, it shows the Linux install, which I assume is the second one. And, given that the one I seem to be using is only 8.1, I do get messages if I try to install another program about not very much memory left.