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Can we use startosinstall option on a USB as a bootable. createinstallmedia helped us create an bootable installer.

  • July 11, 2018
  • 1 reply
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Is there a way where we can use the startosinstall on a USB and boot from it. I was looking for a result would be similar to NetRestore.

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      • AndreasRumpl
      • Contributor
      • July 11, 2018

      Although i think its not "best practice", it is possible:

      #create the USB Installer
      -Download the OS X High Sierra installer via the App Store, it will be installed into the /Applications directory
      -If it opens automatically, close it
      -Insert a USB stick (8GB+)
      -Run the following command where MyVolume is the name of the USB volume:
      sudo /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume

      # boot the USB installer
      -Boot the computer holding the Option key
      -Select the USB installer as the startup disk
      -Open Utilities > Disk Utility and make sure that the internal SSD/HDD is properly formatted (e.g. in HFS+ or APFS), named (Macintosh HD) and erased -Close the Disk Utility and -Open Utilities > Terminal and type the following: "/Volumes/Image Volume/Install macOS High Sierra.app/Contents/Resources/startosinstall" --volume “/Volumes/Macintosh HD” --converttoapfs NO --agreetolicense

      -By use of that command the machine will restart and install macOS High Sierra without APFS conversion. (for APFS conversion you can simply use "--converttoapfs YES" or don't use that command

      This method was tested on 10.13.5 and 10.13.6.

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