Windows 10 ISO to bootable USB in MacOS (balenaEtcher, Rufus and Unetbooting alternative)

bootable-win10.sh

    # inspiration from here as I was looking for an alternative to balenaEtcher, Rufus and Unetbooting
    #
    # https://forums.balena.io/t/missing-partition-table-issue/175129/10
    #
    # there is a single file sources/install.wim that is larger than 4GB
    # and the FAT32 file system has an issue with that, so we will use this
    # to split it into chunks that are less than 4 GB each
    brew install wimlib
    
    # check the file name of the ISO downloaded from microsoft.com
    image_file=Win10_21H1_English_x64.iso
    
    # special kind of mount. Keep in mind that it will not be displayed
    # as a volume in the finder window or finder sidebar
    hdiutil mount ${image_file}

    # find windows ISO mounted volume name 
    ls -lha /Volumes
    
    # update variable with name
    mounted_iso_name=CCCOMA_X64FRE_EN-US_DV9

    # assuming USB is on /dev/disk3
    usb_disk=$(diskutil list | grep external | head -n 1 | awk '{print $1}')
    
    # let's format the USB drive and label it WINDOWS10
    diskutil eraseDisk MS-DOS "WINDOWS10" MBR ${usb_disk}
    
    # copy everything, but the larger then 4GB file sources/install.wim
    rsync -avh --progress --exclude=sources/install.wim /Volumes/${mounted_iso_name}/ /Volumes/WINDOWS10
    
    # let's split it now and copy it over the USB next
    wimlib-imagex split /Volumes/${mounted_iso_name}/sources/install.wim /Volumes/WINDOWS10/sources/install.swm 3800
    
    # Eject the Windows10 volume
    hdiutil eject /Volumes/WINDOWS10
    
    # Eject the ISO mounted volume
    hdiutil eject /Volumes/${mounted_iso_name}