jmbaron Posted November 25, 2016 Share Posted November 25, 2016 I am trying to install OS X Lion on an external hard drive. I took the InstallESD.dmg file from the 'Install Mac OS X Lion.app' I then made 2 partitions on the hard drive (250gb) 1. Mac OS X Lion (10.7) 2. Mac OS X Install ESD I then clicked 'Restore' on the Mac OS X Install ESD partition and made it restore with the 'InstallESD.dmg' file. My problem is when I try to boot from the hard drive, I get the prohibited sign (\) I am on a mid-2012 MacBook pro running macOS SIerra and I am trying to run Mac OS X Lion 10.7.5 Link to comment Share on other sites More sharing options...
Donk Posted November 26, 2016 Share Posted November 26, 2016 I think you may have missed that he is on a real Macbook and does not need Hackintosh components. The best way I would suggest is get a USB key and use createinstallmedia from Lion installer https://support.apple.com/en-us/HT201372. Then plug USB key and external drive in and boot from USB key and finally select external drive for installation. Link to comment Share on other sites More sharing options...
Donk Posted November 27, 2016 Share Posted November 27, 2016 Yep - probably not the best section for the question. I agree that option is also OK, but I am overly cautious and keep away from touching the main drive when doing this sort of task. Link to comment Share on other sites More sharing options...
Recommended Posts