can't boot arch from usb.

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https://bbs.archlinux.org – I'm not familiar with Fedora's applications so that doesn't help me much. Which version of Arch is it using? That is, which iso? The latest, I think, is the August one unless the September one is already out.It would also help if you posted exact error messages rather than that "it tells me that there is something wrong with mounting .", for example.It is going to be hard for people to help without more information.You should definitely read https://wiki.archlinux.org/index.php/Beginners%27_Guide if you have not already done so. cfr https://bbs.archlinux.org/p (HowTos)