U3 is some crappy flash drive software that sucks and no one should use it. It may have come preinstalled on your card. Basically, it's made for Windows (and thus is an .exe), but ITG runs off Linux. So, more often than not, you'll get a card mount error when you insert the drive into the machine, as U3 tries to run the .exe but Linux doesn't know what to do with it.
If you have nothing important on your card: plug it in, go to My Computer, right click the drive, and hit format. A dialogue should pop up. Choose FAT32 as the file system and hit "format". When it's done, go back to your arcade and see if that works. If not, it's possible the USB readers are dying, as many are across the country. Check with friends to see if their cards work.
skins, in a post on this very site, wrote:is there a better site i can get to get better songs + steps
i already got FFR