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.
What you need to create a bootable installer
/volumes/installer/installer.app/contents/macos/installerDownload macOS
Much like prior versions of Mac OS, you can easily create a bootable install drive for MacOS Mojave 10.14. These boot install drives allow for things like easily formatting a Mac to perform a clean install of macOS Mojave, installing macOS Mojave onto multiple Macs without them each having to download the installer, or even as a troubleshooting tool since it can be booted from by any. Macworld also has bootable-install-drive instructions for: mac OS High Sierra (10.13) El Capitan (OS X 10.11) Yosemite (OS X 10.10) Mavericks (OS X 10.9).
Use the 'createinstallmedia' command in Terminal
Chit chit app mac. Big Sur:*
Catalina:*
High Sierra:*
El Capitan:
* If your Mac is using macOS Sierra or earlier, include the
--applicationpath argument and installer path, similar to the way this is done in the command for El Capitan.
After typing the command:
Use the bootable installer
After creating the bootable installer, follow these steps to use it:
Learn moreWhat Is Volumes Installment Installer.app Contents Macos Installer Windows 10
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 the appropriate path in Terminal:
What Is Volumes Installment Installer.app Contents Macos Installer Download
If you install macOS on an additional volume of your startup disk, you can switch between that macOS and the macOS on your other volume, as if each were on a separate disk. And because storage space is shared across APFS volumes, you don't need to reserve space for the new volume. Its size automatically adjusts to fit your content.
What you need
Your Mac must already be using macOS High Sierra or later on an APFS-formatted startup disk. Find out which format your startup disk is using.
You don't need to reserve storage space for the new volume, but macOS needs as much as 20GB of available space to install, depending on the version of macOS. If you don't have enough space, the installer will let you know.
About This Mac includes a storage overview: Choose Apple () menu > About This Mac, then click Storage.
Back up your Mac
It's a good idea to back up your Mac first, especially if you're installing a beta version of macOS. Beta software is software that is still in development, so some apps and services might not work as expected.
Add an APFS volume
What Is Volumes Installment Installer.app Contents Macos Installer 10Install macOS on the volumeWhat Is Volumes Installment Installer.app Contents Macos Installer Free
Choose an installation method:
How to authorize an app on mac. When the installer opens and you're asked to choose where to install, click Show All Disks, then select the new volume.
Switch between macOS versions
After installation is complete, you can use Startup Disk preferences or Startup Manager to quickly switch between each macOS:
Keep the macOS on each volume up to date
Mac app is damaged and cannot be opened sierra leone. To find the latest updates for each version of macOS, check for software updates, then start up from the other volume and check for software updates again.
Learn more
If your Mac is using macOS Sierra or earlier, or the startup disk is formatted as Mac OS Extended instead of APFS, you can create a new partition instead. The space it occupies doesn't automatically adjust to fit your content, so you must manually size the partition. Learn how to add a volume to a device formatted as Mac OS Extended.
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