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I know how to make a bootable USB, but how does one make an ISO image out of a bootable USB?

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We will need more details, what is the contents of the ISO, specifically the OS and bootloader. If this is MacOS this is simple. –  Tim Jun 8 '12 at 14:38
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up vote 1 down vote accepted

You can use dd to duplicate data across devices. Using conv option you can modify data during transfer

dd if=/dev/sda1 of=myiso.iso
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Can't believe I haven't tried that. Thank you. –  socks Jun 8 '12 at 16:20
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