M7 does work, worked for me. the only problem is that it doesent support a g drive or f past 137 gigs. so you must use xboxtool to modify it to make it better. If your drive is already partitioned for f to 137 gigs and then all rest to g drive then you probly wanna leave it this way, enable LBA48 support and make the bios 137 gig to partition6, rest to partition 7 and you shouldent have to reformat the hard drive. but if your like me and originally formated you had drive to have a g drive and have stuff on it right now and want all available space to go to the
f drive,partition 6, thats 250 gig on f drive for me. then you need to back up all games on computer then flash your modified bios, you modify your bios with xbox tool, you have to creat a bios useing m7, enable LBA48, and all space to partition 6, you then need to flash this new bios, then reformat your had drive so that it has a f drive, no g drive this time. then transfer all games from your computer back to your box.