Note that the createinstallmedia command erases anything on your external disk though, so make sure there’s nothing on it that you need. You’ll find all the createinstallmedia commands below, including the Monterey createinstallmedia command. The createinstallmedia command makes it possible to create a bootable copy of an installer on any drive that’s connected to your Mac. Since Mavericks, creating a bootable installation of macOS requires a single command in Terminal. Also, the processes have changed slightly since Mavericks so if your looking to create an installation of one of the ‘Cat’ versions of Mac OS X you should read this older article instead. Note, the createinstallmedia method described here doesn’t work under OS X 10.6 Snow Leopard or earlier – it requires OS X 10.7 Lion or later. Now you have the installation files, we can move on to the process of making the bootable installer. Step 2: Create a bootable installer for macOS A disk image named InstallOS.dmg will download and once it does you need to locate the pkg installer inside the disk image. Getting old versions of macOS is a little more difficult if you don’t know where to look, but Apple provides dmg files of these older macOS versions(you need to download them in Safari).
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