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There are many similar questions already, but many concern only Windows 7 and answers suggest steps to follow under Windows with some Windows tools, in others some specialized tools like UNetbootin are recommended, or the question concerns not a DVD but an ISO image. In any case, I could not figure out yet how to do such a seemingly simple task with basic Linux tools, and why I can make a bootable USB drive with dd command from a downloaded ISO image, but cannot do the same from a bootable DVD. I am looking for basic solutions and an explanation of what is going on.

I have found out that a simple dd command like

sudo dd if=/path-to/some-linux.iso of=/dev/rdisk1 bs=1048576

works for me to create a bootable USB drive (disk1) for an EFI system from a downloaded ISO image of NixOS or Ubuntu. (I am doing this under Mac OS.) However, doing

sudo dd if=/dev/rdisk1 of=/dev/rdisk2 bs=1048576

where disk1 is a bootable Linux Mint or Windows 7 DVD and disk2 is the USB drive does not create a bootable USB drive. Moreover, a USB drive created in this way can be mounted and explored under Mac OS, but bootable USB drives created from ISO images are not readable under Mac OS.

Can anyone explain to me, please, why dd does not work here directly from DVD to USB flash drive? Is there some simple (preferably commande-line) solution?

P.S. Initially I needed to make a bootable Windows 7 USB from a recovery DVD without access to any other Windows machine, but it turned out that I cannot make a bootable USB from a Linux Mint bootable DVD either.

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