Terminal shows the progress as the volume is erased. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal doesn't show any characters as you type. When prompted, type your administrator password. If it has a different name, rename it or replace MyVolume in the command as needed. Each command assumes that the installer is in your Applications folder, and MyVolume is the name of the USB flash drive. Type or paste one of the commands below into Terminal, then press Return to enter the command. Open Terminal, which is in the Utilities folder of your Applications folder. If more space is needed, Terminal will let you know.Ĭonnect the USB flash drive directly to your Mac. When you create the bootable installer, this volume will automatically be erased.Ī 32GB USB flash drive has more than enough storage space for any macOS installer, and 16GB is enough for most earlier versions of macOS. It should be an app, not a disk image (.dmg) or package (.pkg) that contains the installer.Ĭonnect a USB flash drive or other secondary volume to your Mac. Make sure that the installer is named Install, such as Install macOS Sonoma. This is the folder that opens when you choose Go > Applications from the menu bar in the Finder. Make sure that the installer is in the Applications folder of your startup disk.

Find out which macOS your Mac is using.Įnterprise administrators: Download from Apple, not a locally hosted update server. Use the bootable installer Download a full macOS installer from Appleĭownload macOS from the App Store or your web browser using the links provided in How to download and install macOS.ĭownload from a Mac that is using the latest version of OS X El Capitan or later and is compatible with the macOS you're downloading. Use Terminal to create the bootable installer You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful if you want to install macOS on multiple computers without downloading the installer each time, or if you can't install a compatible macOS from the Finder or macOS Recovery.ĭownload a full macOS installer from Apple These advanced steps are primarily for system administrators and other experienced users who are familiar with entering commands in Terminal.

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