A:Answer Jake, this is a late response. I am sure you discovered the difference for yourrself by now. I own 4 of the My Passport drives. None of them the X model. As near as I can tell, after doing some quick research, the difference is that the X series is preformatted with Fat32 to enable it's instant use on a XBox (360, One, One S and One X). The My Passport series is formatted with NFTS, making it preferrable to PC users. I myself, own every model XBox made and did not know this.