![]() It might take some time depending on the macOS version and the USB drive that you are using, but once it is complete, your new installer USB will be ready. Confirm that you are okay with all the data on the flash drive being erasedĪfter that, the process will begin.Also, remember to rename macOS\ Installer to whatever the actual name of your USB volume is. This is important because otherwise, the createinstallmedia application will interpret everything after the space character as a new command. Remember that all spaces in the file name and the path (including the name of the USB drive's volume) need to have a backslash before them, like this: \. ![]() Sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/macOS\ Installer -applicationpath /Applications/Install\ OS\ X\ El\ Capitan.appįor OS X Yosemite and installers for other older versions of the operating system, use the same command as for OS X El Capitan, but replace all instances of Install\ OS\ X\ El\ Capitan with Install\ OS\ X\ Yosemite, or whatever the name of the OS X installer application is. Sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/macOS\ Installer -applicationpath /Applications/Install\ macOS\ Sierra.app Sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/macOS\ Installer To copy the installation files to the USB drive and to make it bootable, first, you will need to copy the command that you will use, which will be different depending on your macOS version. With that, you now have all the pieces required for creating a macOS installer USB. You can either just download the latest version of macOS High Sierra, or, if you've downloaded older versions before, find previous versions of macOS, which would be listed and available for download under the 'Purchased' tab in the Mac App Store. ![]() Next, you need to download a macOS installer from the Mac App Store.
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