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You're totally correct, it is indeed just putting the drivers on the installation media and partitioning magic.

• Tsiklon 6y ago
  On 2017+ machines you don’t even need an external drive, during the partitioning setup it carves out a temporary partition to store the contents of the ISO + their drivers, windows installation customisation etc. And it’s all deleted after the installation of the drivers after windows is installed
  • johnwalkr 6y ago
    It's one of the easiest windows installs you can do.
  • Kwpolska 6y ago
    My 2015 Mac (running Big Sur) did that temporary-partition dance too.