Since I used my keyboard hub (Mac Pro), decided to try with the USB directly attached to the back of my Mac: still same error so, since I also happen to have 10.11.5, tried with that minor earlier version: createinstallmedia run works without the aformentioned error! no need to worry about firmware update or using 2.0 as another factor or “sudo diskutil enableownership /dev/disk3s2” type command). iabootfiles error when making media from the 10.11.6 installer) even tried to boot to that installer in case it didn’t matter, but the USB stick didn’t show up as an option (and this was on a machine that could boot to USB 3.0 i.e. I too got same result (got that prelinkedkernel couldn’t be copied to. Sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia –volume /Volumes/Sierra –applicationpath /Applications/Install\ macOS\ Sierra.app –nointeraction Sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia –volume /Volumes/Capitan –applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app –nointeractionįor Sierra it should be (make sure your external volume name is Sierra for the following to work): Sudo /Applications/Install\ OS\ X\ EI\Captian.app/Contents/Resources/createinstallmedia –volume /Volumes/Captian –applicationpath /Applications/Install\ OS\ X\ EI\Captian.app –nointeraction Just fix those 2 misspellings/spacing and try again. Ou have El\Captian in your sudo command instead of El\ Capitan with a space after the \. Guys, for all who have a problem with “command not found” – beware of spaces used in sythax command! Found great solution on apple forum If you have any questions, thoughts, or info about making an OS X El Capitan bootable installer drive, do let us know in the comments! If you want to watch a video walkthrough of the entire process of making an OS X El Capitan bootable installer drive, we’ve got you covered, here it is embedded below for easy viewing: Can you show me how to make an Install OS X El Capitan boot drive? Otherwise, you can insert the installer USB disk / flash drive into any Mac and launch the installer directly from the drive. To boot from the installer drive, hold down the Option key during Mac system start, and select it from the startup volume menu. When you see “Done”, that’s it, your OS X El Capitan installer drive has been created, it’s bootable, and you can use it to update as many Macs as you want to with OS X 10.11. This can take a while to complete, so wait for the “Done” message before continuing. The target USB disk or flash drive will be erased first and then copy the files to it so that it will become a bootable OS X El Capitan installer. You’ll then see the following screen text in the Terminal: Hit the Return key and enter the administrator password when requested. Sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/ElCapInstaller -applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app -nointeraction Launch the Terminal application, found in /Applications/Utilities/ and enter the following command exactly (unless you changed the target volume name from ElCapInstaller to something else) onto a single line, the text will wrap because it is long, but it’s important to have proper syntax: 2: Make the OS X El Capitan Bootable Installer Drive with a Terminal Command You can do this through the Terminal or the Finder as shown above. To avoid any confusion, we’re naming the USB drive to “ElCapInstaller” (without the quotations), though you can name it whatever you want as long as you adjust the command line syntax to match. The next thing you’ll want to do is rename the target volume that you wish to turn into a bootable installer drive, in this case an external USB flash drive. 1: Rename the USB Flash Drive to Become the OS X El Capitan Bootable Installer When you’re ready, plug the USB / flash drive into the Mac with the OS X El Capitan installer application on it. Presumably you have already made the USB flash drive into a Mac compatible format with Disk Utility, if not you can follow the directions here to format a drive for Mac OS X compatibility HFS+.
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