![]() Some Basics of macOS install from a bootable USB Drive In this regard, you need to install macOS from an external drive or USB. But sometimes, we may require a clean install of a macOS version for hardware/software troubleshooting, or to be able to install the same macOS system on multiple devices at the same time. To upgrade and install the latest macOS update on your Mac machine, you can easily get it within the system's Software Update option. If you like, you can rename the drive from its default name of Install macOS Mojave though I tend not to as it makes them easier to find later if you keep the original name.Step 2. You now have a bootable Mojave install drive. Install media now available at "/Volumes/Install macOS Mojave" $ sudo Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia -volume /Volumes/Install/ -nointeraction -downloadassetsĮrasing disk: 0%. For this reason, use the above command instead of updating the command quoted in guides written for older versions of macOS. That flag is now deprecated and will throw an error if used. Previous versions of macOS used an "-applicationpath" flag in this command.However, the above command will still function without this flag if you prefer. This is presumably helpful for faster or offline installations, as it won't require downloading during installation. It downloads assets which may be required during installation. The "-downloadassets" flag is new in macOS Mojave.If you would like to be asked for confirmation before erasing the drive, remove "-nointeraction" from the above command.Run the following command which will first format the drive, then create a Mojave boot/install image on that drive.$ ls /Applications/Install\ macOS\ Mojave.app/ This means that if you moved it before installing Mojave you need to move it back before making your installer disk The Terminal command used here assumes the drive is named Install, rename the newly formatted USB drive to Install and also make sure the Mojave installer, called Install macOS Mojave.app is in its default location in your main Applications folder.If it isn't formatted to GUID Partition Map and Mac OS Extended (Journaled), you can launch the Disk Utility application and format it from there. It's also simpler to leave the file name as is: Install macOS Mojave.app. If you'd already placed it somewhere else on your computer, move it back to the Applications folder. Quit the installer, and instead locate it in your /Applications folder. When the download completes, your Mac will launch it. ![]()
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