I've seen multiple reputable people say exfat works, but it definitely doesn't in my car, so there may be some hardware change they made at some point that allows it to work somehow. I don't understand how that could be the case, but maybe it is. I've tried, multiple times, formatting to exfat, both on windows and macs, and it just doesn't work. Although there was that one time someone swore up and down that exfat worked, and i asked him to send me a screen shot of the properties for that drive, and it was clearly formatted Fat32.