mounting problem during installation of archlinux on dell xps one

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http://unix.stackexchange.com – I've been trying to install archlinux on xps one. the screen doesn't work because it has intel g45/g43 express chipset. I had to use nomodeset option as mentioned in the installation guide. Arch somewhat booted but i get an error: :: Mounting '/dev/disk/by-label/ARCH_201212' to '/run/archiso/bootmnt' Waiting 30 seconds for device /dev/disk/by-label/ARCH_201212 ... ERROR: '/dev/disk/by-label/ARCH_201212' device not show up after 30 seconds. .. Falling back to interactive prompt You can try to fix the problem manually, log out when you are finished sh: can't access tty; job control turn (HowTos)