Diamonds said:Try running Horizon as administrator and see if that works.
My computer reads it fine.Difficult said:It's not horizon it's probably the USB, does your computer read the USB or is it only horizon that doesn't read it?
Diamonds said:Try using modio or something else then
Magneto said:Plug your flashdrive into your xbox, see if it is compatible and if not, xbox will ask you to sync it so it is, after that try t again.