Once the Startup Manager screen appears, release the Option key. Holding that key gives you access to OS X’s Startup Manager. Press and hold the Option key immediately after you see the Apple logo. Turn on your Mac (or Restart your Mac if it’s already on).ģ. Insert the USB boot media into a USB slot.Ģ. Use the following steps, you can easily set Mac boot from an external drive in Startup Manager, so it’ll only boot from USB that one time.ġ. Getting your Mac to load from a USB drive is fairly straightforward. Way 1: Boot Mac from USB flash drive using Startup Manager Let’s see how to boot a Mac from a bootable USB drive and what to do if your Mac doesn’t start up from it. Bootable USB thumb drive formatted with a GUID partition type and containing an OS X installer or a usable operating system.Starting up your Mac from an external disk requires the following: This guide provides 2 ways to boot a Mac from a USB flash drive. For example, if you install macOS or Microsoft Windows on a USB drive, your Mac can recognize that drive as a startup disk. If you don’t know the password for the root user, follow this Apple support page (Opens in a new window) to learn how to change this password.By default, Mac starts from its built-in hard disk, but a startup disk can be any storage device that contains bootable contents that compatible with your Mac. Rather, it’s the password for the root user on your Mac. This is not the password for the account that you use to log in. 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 MacOS High Sierra: sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/ MyVolume MacOS Mojave: sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia -volume /Volumes/ MyVolume MacOS Catalina: sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia -volume /Volumes/ MyVolume MacOS Big Sur: sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/ MyVolume Replace the string My Volume with the volume name of your USB drive. At the Terminal prompt, type one of the following commands, depending on your version of macOS. Return to the Utilities folder on your Mac and open the Terminal app. Make sure the USB drive is still connected to your Mac. How to Set Up Two-Factor Authentication.How to Record the Screen on Your Windows PC or Mac.How to Convert YouTube Videos to MP3 Files.How to Save Money on Your Cell Phone Bill.How to Free Up Space on Your iPhone or iPad.
How to Block Robotexts and Spam Messages.
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