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[yourwishismine]

the only file you need for mxm to run is the default.xbe...
or what ever you happended to change it to...

of course you will want to boot to your MS dash and delete and save games that you don't want or need...
(and yes homebrew stuff uses those to.. you'll see what I mean)

you won't hardly save any space on your drive cleaning up most of that though..

but if you just want it to look pretty...

also.. if you are running any emulators... a lot of them put stuff on drive e by default...

usally in folders called saves, snapshots, ect....

don't delete anything in the e:\tdata
or e:\udata unless you know what you are doing....