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I've been looking for a while for an option to boot from an ISO file on a USB disk on an old machine whose BIOS doesn't support boot from USB.... I have already found a solution to config grub to boot from a bootable USB disk: http://ubuntuforums.org/showthread.php?t=992426 I also found a solution to boot from an ISO file with grub2: https://help.ubuntu.com/community/Grub2/ISOBoot/Examples Now I am looking for the combination of these two.... Any idea?

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If the BIOS does not support boot from USB, there is nothng you can do, the hardware simply does not support it. –  Ramhound Sep 3 '13 at 15:10
    
Thanks for the answer, but it doesn't really true. There is a solution, if you install grub on the hardrive and configure it to boot from USB. I tested it, it works. The current problem is to boot from an iso file on the USB. –  swizzly Sep 3 '13 at 17:26
    
Just place the contents of the iso on the USB device and make the USB device bootable. –  Ramhound Sep 3 '13 at 17:42

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