If I'm using homebrew to install games on an external with disc based tickets, does the system essentially revert to a stock wii u if I remove the external and sd card with homebrew on it? I mean, does the installation process leave some sort of information on the wii u such that I may be at risk to update the system later on even if I did remove the external? Also, since the console is viewing the games as discs, can I take my external to a friend's house and plug it into his wii u and play games off of it, or is there still something tying the installed games specifically to my wii u? Unrelated question, is there any danger in installing a game that I actually have a disc of? What happens if I put the disc in, will there be some sort of conflict since the system thinks there are two discs of the same games in the system? I am probably deeply misunderstanding the disc ticket process but this seemed a tad confusing to me. Cheers.