I am going to also test this theory with my OS X El Capitan (10.11.6) installer as well, and I will report back with my results later. As a bonus, I was able to successfully create the High Sierra and Mojave installers without issue on the same three flash drives. It should also be noted that I used a total of three separate USB flash drives. app file and confirmed that it launches normally and successfully to permit an upgrade install to proceed (only on OSes older than 10.12). In each of the scenarios above, the latest version of the macOS Sierra installer (10.12.6) with unexpired certificate (2029 expiration) was used. Here are my results from Apple's sanctioned use of the createinstallmedia command line tool in Terminal:Īs you can see, the error, " /Volumes/1012 is not a valid volume mount point. Delete your install application, then download it again from the App Store." DiskMakerX - " Sorry, your OS X Install app or DMG may be incomplete.It probably couldn't be unmounted to erase it." Try ejecting the destination disk and reinserting it, or rebooting. Install Disk Creator - " An error occurred. I additionally tested the issue by using Install Disk Creator (v1.3 (1) v 1.4 (3) ) and DiskMakerX (v6rc5): 2012 MacBook Pro running OS X El Capitan 10.11.6 - Result: ' is not a valid volume mount point.'.
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