So the first two steps are the same, then Windows and Linux have separate procedure. For generic Linux installation ISOs this procedure would be simpler. Windows 10 is a very specific bootable media, so the process is a bit involved. All of these need to be done in the Terminal app. Here are the steps I had to take on my MacBook, originally procedure was written in macOS High Sierra, but I tested it in MacOS Mojave 10.14.2 as well. This approach will be simpler for any other ISO image like Ubuntu or CentOS, so there’s a separate Steps 3-5 for them at the end of the post. Since it’s possible to boot and install Windows 10 from USB, that’s what I decided to do: download Window 10 ISO and burn it one of the USB sticks I have. If you have Homebrew or MacPorts, you can get a progress bar by installing the "pv" command and using that instead of "cat".I needed to reinstall one of my Windows PCs at home recently, and realised that I only have Windows 7 DVDs, but no Windows 10s. No progress is shown while writing this way. You will be prompted for the administrator's password. r is for raw disk, as writing to /dev/rdisk2 is much faster than writing to /dev/disk2. dev/rdiskN is the same disk you have found previously, with an r in front. # sudo sh -c "cat /path/to/downloaded.iso > /dev/rdiskN" Where /dev/diskN is the one you have found in previous step as per our example it would be "/dev/disk2". In this case "/dev/disk2" is the one we want. Then note the corresponding /dev/diskN, where "N" is for index of your disk. This will print out the list of currently mapped devices/partitions. Plug-in your USB stick and find what "/dev/diskN" it is mapped to by opening Terminal (where "N" stands for "disk0", "disk1", "disk2" etc). It now contains a bootable openSUSE installation media. The process of burning can last from 1 to up to 30 minutes depending on your drive and on the iso file. The drive can be reformatted and used as a normal drive again after the setup is finished. Warning: All data on the drive will be destroyed.
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