I'm sorry I'm not able to test this Theory but that's as far as I know last time Xbox 360 will only allow up to 16 gigabytes formatting on USB drive so even if you have 64 gigs it won't matter it's only going to recognize 16gig of it. But things may have changed on the Microsoft and I'm not really for sure. By the way you still have to format whatever USB drive you put into an Xbox 360 for them to even work.