![]() Select the bootable USB drive from the list and follow the steps on the screen to finish the process. Note: If you are using Apple silicon based processor, press and hold power button during restart till you see all bootable volumes. It may take long time depending upon your Mac to start booting from USB.You will see macOS Recovery app and choose “Install macOS” option from Utilities.Double click on your USB that contains the macOS installer or highlight it and press the return key.Select your Wi-Fi network name from the “Choose Network…” dropdown and enter the password to connect to internet. Remember, you need to have an internet connection for installing from USB as the installer needs to get updates for your Mac from Apple’s server.Terminal will ask you to confirm erasing the volume, press Y and hit enter to confirm.You need to enter admin password to proceed further.Note the “Boot Disk” is the volume name of USB, make sure to use your USB drive name in the command.Sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/Boot Disk If the OS name has two words like Big Sur, then the command will change like below:.Sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia -volume /Volumes/Boot Disk Copy and paste the below command in Terminal and hit enter which uses the example of Mojave version.Press “Command Spacebar” and search for “terminal” to open Terminal app.Also, make sure the downloaded macOS installer file is in “Applications” folder.At this point, ensure you have inserted the formatted USB drive, let’s say the name of the USB volume is “Boot Disk”.Simply quit the installer without starting the installation process. Creating USB Installer with createinstallmedia CommandĪfter downloading, the installer will automatically ask you to install macOS Mojave. This will start downloading the installer file to your “Applications” folder. In our example, we have FAT32 file system which is only compatible on Windows PC. Hence, we need to erase and format the USB to be compatible with your Mac. ![]() You can view the current file system of the USB drive. Press “Command Spacebar” to access Spotlight Search, then type “Disk Utility”. Format USB Flash Drive to Apple File Systemįirst, plug in your USB drive. Remember to copy and backup the USB since you need to delete the entire content for creating the bootable drive. So, ensure to have at least 32GB or greater storage space on your USB drive. Also the process needs sufficient storage space on your USB. The macOS installer file is larger with approximate size of 6 to 10GB depending upon the version. Otherwise, you should have another Mac for creating a bootable USB. If you are not able to login to your Mac, then you can use Time Machine backup disk.
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