It's well-documented that creating an install drive erases the target medium, but what about later, during the install process ?

i.e. can I create a bootable flash installer, and then add files to it, knowing that a later use of the flash for an installation will not erase those files ?


In my experience you can indeed put files on a flash drive that you made to boot and install macOS. The install process only reads from the flash drive. So your utilities should be safe.

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  • Thanks Steve -- this is the sort of question that only someone who has done a lot of installs would be able to answer. – cesces Feb 3 '18 at 14:07
  • If you could please mark my answer as accepted... – Steve Chambers Feb 12 '18 at 1:41

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