I currently have (Arch) Linux on my MacBook Air (2012), and I want to install High Sierra on an external drive, so I can run the new eficheck. How do I do that, and without disturbing my existing Linux installation?

In particular I'm worried that the installation would mess up my current booting scheme. It would be fixable, but I don't have time for that kind of problem now. If it would just change the efibootmgr order, I know how to alter that.

  • Does your MacBook support internet recovery? If so, that and an external boot capable drive would do the trick to run the installer. – bmike Sep 26 '17 at 11:44
  • Download High Sierra on a second Mac, create a 10.13 USB installer, boot your Mac from this thumb drive and install 10.13 to the external drive. – klanomath Sep 26 '17 at 11:45
  • @bmike Internet Recovery will install the original OS X/macOS the Mac came with. – klanomath Sep 26 '17 at 11:47
  • Not necessarily but possibly @klanomath. support.apple.com/kb/HT204904 There‚Äôs even a single user mode boot combined with internet recovery to get someone a shell from the internet. – bmike Sep 26 '17 at 11:50
  • @bmike hmm a new shortcut ;-) – klanomath Sep 26 '17 at 11:52

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