My experience tells me that the graphical startup disk creator can cause the same problems as using the other tools you know (only exception being, of course, GNU `dd`).
As far as I understand (and please, don't take my words as true, because I'm still learning what `dd` does): `dd` works because it copies the **contents** of the input file to output file. However, if I recall correctly `dd` doesn't make registries in the file system where the output file is (for example, if you were to use `dd` to copy a directory to some other place in same file system, you might end up with a broken output file). This is why we must unmount the USB disk device (and preferably, format it) before copying a live image to it (because the file system in this case would be that of the USB disk device).
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