sorry zep25 i don't know
i assume that with "partition 6 takes the rest/no partition 7" selection i would be ok.
but i simply don't know.
my problem was i was "missing" 20gb i really didn't care were i had to go to get it, i just wanted it.
also if you want to upgrade your HDD later (i will once i fill my extra space) with a HDD around 300gb
400gb or even a tetrabite G: will end up being the biggest anyway.
avalaunch/unleashx/evolutionX were written before LBA 48 support, when g: was "impossible" now they are patched for g: drive support
with xbmc it really doesn't matter, cause it makes your xbox more like a home PC than a video game console.
xbmc see's everything even x/y/z
i don't care were my space is, i just want it.
sorry i can't answer your question, but i hope this helps