i thought i might put this up in relevance to this situation. i've been a modder now for quite some time now, and just recently i put 320gb hdd in my xbox. its quite full of various media, and the f: got partiotioned with about 312gb of that space after an evox format. i never really went past filling 256gb worth of the f:/ partition until the other day when i decided to bak up sum stuff off my computer and then reformat the pc. so anyway, i put the stuff on that i wanted to backup, reformatted my pc and then begin the rebuild. when it came time to put the files back on, i went into my f: and there was nothing in any of the directories, they were totally empty. the thing was that i didnt get the space back. so naturally, somehow the fatx has been screwed with and the data cant be gathered. so i tried to scrape the underlying data using a scalpel, to no avail. as it turns out, the fatx cant support a single partition being bigger than 256 gb, sure u can see it, but the balance of the free space (post 256gb) isnt writable to. the drive starts to re-image over the top of itself. sure you can have a drive bigger than 256gb, i just wouldnt suggest partitioning more than 256gb to any drive. using frosties recovery disk and xb partitioner which is very straight forward, u can set up to about 6-7 media partitions. i ended up having to reformat my xbox aswell, and lost a 600gb library in total off my network. now i've got 2 drives of 155gb set to g:/ and f:/. i've written this post for anyone seeking answers as to why there xbox makes files disappear without giving bak the space. this is the reason, its happened to a lot of people and no-one seems to know why. i hope this sheds some light on the subject.