This video shows you how to create a bootable USB Flash Drive Mac OS X Installer. You will be able to boot most Macs from it and then install Mac OS X 10.15 Catalina without needing to re-download the installer for each Mac. You can also use it to format the internal drive of a Mac using the built in Disk Utility, this is also covered in the video.
You will need a 16GB or larger USB Flash Drive, but 32GB is best (aka USB key). Make sure it's empty, because you'll be deleting everything on it during the process of making the installer.
You will use a command in the Terminal. It is best to copy and paste it from here, just make sure you name your USB Flash Drive “MacInstall” (without the quotes). If you type it, make sure you type it correctly, or you will get an "unknown command" error. Here is the command for your reference:
sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/MacInstaller/ --nointeraction &&say Done
URL to find Catalina if it is not the current Mac OS and is not in the Mac Store
[ Ссылка ]
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