These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.
Remember that whatever drive you use is completely erased by DiskMaker. If you’re thinking about making a single disk that can install Yosemite, El Capitan, Sierra, High Sierra and Mojave, use Disk Utility (found in the Applications/Utilities folder) and partition the drive into five separate volumes — one for each operating system version. Attach the drive to the Mac, make sure that the drive is visible from the Finder (in some cases a drive icon may appear on the Desktop), then launch DiskMaker X 8. Note that if you’ve kept macOS installers from the past in your Applications folder, DiskMaker X asks which version of the operating system you wish to use to make a boot disk from.
Download macOS
Find the appropriate download link in the upgrade instructions for each macOS version:
macOS Catalina, macOS Mojave, ormacOS High Sierra
Installers for each of these macOS versions download directly to your Applications folder as an app named Install macOS Catalina, Install macOS Mojave, or Install macOS High Sierra. If the installer opens after downloading, quit it without continuing installation. Important: To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.
OS X El Capitan
El Capitan downloads as a disk image. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer. Use the 'createinstallmedia' command in Terminal
* If your Mac is using macOS Sierra or earlier, include the
--applicationpath argument, similar to the way this argument is used in the command for El Capitan.
Use the bootable installer
After creating the bootable installer, follow these steps to use it:
Learn more
For more information about the
createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter this path in Terminal:
Catalina:
How To Make A Bootable Recovery Disc For Mac Mojave Drive
Mojave:
High Sierra:
El Capitan:
If you're thinking about installing macOS Catalina, the first thing to consider is whether you want to install it directly onto your Mac or create a bootable drive. You can use a bootable drive on a hard drive partition for dual-software installation, to install on multiple Macs in your home, or as a bootable drive if you can't use the Internet Recovery partition.
Note: These instructions require the use of Terminal. If you don't feel comfortable making changes to your Mac with Terminal, you can create a bootable disk using the DiskMaker X program.
Before you start
Before you get started, make sure you have a thumb drive with at least 15GB of storage, or a spare external hard drive (one you aren't planning to use for anything else). You'll also need to download macOS Catalina and ensure that it's sitting in your Applications folder.
Note: After macOS Catalina has downloaded, it will automatically launch the installer to begin the installation process. Quit the installer when this happens.
And please: Don't forget to back up your Mac before you do anything.
How to format your external drive for macOS Catalina
You'll need to start with a clean thumb drive or external hard drive in order to make it a bootable drive.
Your thumb drive or external hard drive is now ready.
How to put macOS Catalina onto your external drive
Important: You will need to use an administrator account on your Mac in order to run the Terminal commands to create a boot drive. You'll also need to ensure that macOS Catalina is in your Applications folder and you'll need to know the name of the external drive.
The process could take a very long time, depending on the drive. When it is done, the Terminal window will report 'Done.' Your external hard drive will now be named 'Install macOS Catalina.' Safely eject the drive from your Mac.
Free Recovery DiscHow to install macOS Catalina with a bootable installer drive
Once macOS Catalina is installed on your external drive, you can install it on any Mac with the drive plugged into it. You can use this installer to upgrade your operating system easily on multiple Macs or to help downgrade if you decide you want to go back to an earlier version of macOS.
If you're downgrading from macOS Catalina, please check out this guide instead.
If you're upgrading to macOS Catalina, follow the steps below.
Questions?
Do you have any questions about how to create a bootable drive for the macOS Catalina installer? Let us know in the comments.
So, we see how apple treats those that supported them in the beginning as they built their name and market share. Google voice app for macos. We are the artists and creators – still only the 5%, but probably the top 5%. We aren’t their masses anymore.
Updated September 2019: Updated for macOS Catalina.
macOS CatalinaMain
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