I have tried 3 different USB drives in my new Xbox 4GB consol. They all ranged anywhere from 8 to 32GB of storage capacity. One of the bad things I noticed right off is, the 3 USB slots in the back are very limited in how big of a USB stick will fit. My 32GB one was a little too wide and won't insert far enough to make contact, so I had to use an extension cable to get it to work. All 3 drives were formatted by the consol and all 3 came up with the same warning: "If your USB flash drive doesn't meet the USB minimum requirements, you may experience significant performance problems while playing games on the flash drive or saving content to the flash drive." That's just wonderful! I've searched everywhere and all I find is the requirement of 1-16GB of available space. I've got that, Obviously there must be a minimum Data Transfer rate for it to work properly.....................................What is it!!