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Possible Duplicate:
What makes bootable media bootable?
As far as I believe, if you 'drag and drop' an ISO image onto a device such as a usb or cd it won't boot as It's just random files, the BIOS doesn't know It's bootable.
What makes a device bootable to the BIOS; how do you flag a device bootable? What files are essential to a bootable device, ie .img files?
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As far as CD's go, look at the El Torito Standard. Basically, it all works out to a "magic number" that the BIOS reads off of a device which is specifically reserved for bootable devices.
– new123456 – 2011-08-04T13:11:11.403