Release the ‘Option’ key when you see a dark screen showing your bootable volumes.
Press and hold the ‘Option’ key after turning on or restarting the Mac. Plug the bootable installer into a Mac that’s connected to the internet and is compatible with the macOS version you’re installing. The steps are different, depending on whether you're using an Intel-based Mac or one with Apple silicon.
#INSTALL FLASH MAC OS X INSTALL#
It's now time to use the bootable installer to install a fresh copy of macOS.
#INSTALL FLASH MAC OS X HOW TO#
You've made it to the final step of learning how to install macOS from a USB. You've now successfully created a bootable installer that you can use to install macOS on other machines. If asked, click 'OK' to allow the copying of files to proceed. Type 'Y' to confirm that you want to erase the volume, then press 'Return'. Type your administrator password when prompted, then press 'Return' again. Continue with TerminalĪfter pasting the command above, hit the 'Return' key. Change the name in the command to match your settings, if necessary.įor macOS Big Sur, copy and paste the following into Terminal: sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolumeįor macOS Catalina: sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolumeįor macOS Mojave: sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolumeįor macOS High Sierra: sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolumeįor OS X El Capitan: sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume -applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app 3. With each command, it's assumed the installer is located in your 'Applications' folder and 'MyVolume' is the name of the USB flash drive. The command differs, depending on the macOS version you're going to install.
In the next step, you'll enter a command in Terminal. Choose 'Finder' then select 'Go' from the menu bar. Connect the USB flash drive to the computer you wish to install macOS. Refer to the following message from Ubuntu's mailing list if you want to learn more.Once you have your bootable installer ready, it's time to move to the next step.
#INSTALL FLASH MAC OS X DRIVER#
Warning: The driver descriptor says the physical block size is 2048 bytes, but Linux says it is 512 bytes.Īll these warnings are safe to ignore, and your drive should be able to boot without any problems. Try making a fresh table, and using Parted's rescue feature to recover partitions. Is this a GPT partition table? Both the primary and backup GPT tables are corrupt. Or perhaps you deleted the GPT table, and are now using an msdos partition table. Perhaps it was corrupted - possibly by a program that doesn't understand GPT partition tables. However, it does not have a valid fake msdos partition table, as it should. dev/xxx contains GPT signatures, indicating that it has a GPT table. Ubuntu images (and potentially some other related GNU/Linux distributions) have a peculiar format that allows the image to boot without any further modification from both CDs and USB drives.Ī consequence of this enhancement is that some programs, like parted get confused about the drive's format and partition table, printing warnings such as:
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