![]() If not, plug the USB drive into another Mac to check if the drive can show up on it. You can replug the USB drive to your Mac and check if it shows up in startup disk options. Here are some efficient solutions for fixing the Mac that won't boot from a USB drive. What's the case? That shows your Mac doesn't detect the USB drive and therefore, you can't start up from the drive. Unfortunately, when you try to boot your MacBook from the USB drive, you find it doesn't list in the startup options. Mac won't boot from a USB drive, what to do? Select the bootable USB installer and click Restart to boot the Mac from the external USB drive.Click the lock at the bottom left to unlock it.Open the Apple menu > System Preferences > Startup Disk.You can check the chip of the target Mac in the Apple menu > About This Mac.Ĭhange the startup security settings to allow Mac start up from a USB: Or else, you'll fail to boot the computer from the USB. Moreover, if your Mac is T2-based or has an Apple M1 chip, you should also change the startup security settings to enable it to boot from an external USB drive. However, booting up a MacBook from a USB drive only once or for every startup is different. How to boot your MacBook from the USBĪfter making a bootable USB installer, you can use it to boot your Mac like MacBook Pro or MacBook Air. If you think it is troublesome and time-wasting to do this job, you can use the Rufus for Mac utility to help you. Now, you have created a bootable installer for macOS on your USB drive. During the process, you'll see the system installation progress. Wait a moment until the words "Copy complete and Done" notification appears. Type Y when warning that the USB drive will be erased. ![]() Enter your admin password if required and hit Return/Enter.ĥ. MacOS Mojave sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolumeĤ. 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 MacOS Monterey sudo /Applications/Install\ macOS\ Monterey.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume You should replace it with your USB drive name. Here "MyVolume" means where the macOS installer file will be stored. Copy and paste the one of the commands below and press Return/Enter. Connect your Mac OS Extended formatted USB drive to the Mac machine.Ģ. Here's how to create a bootable USB installer for macOS:ġ. Or, you can watch the video mentioned above, which is more visual. Please pay attention to every step below. This process is also what we called to create a bootable USB installer. How to create a bootable USB installer for macOS?Īfter downloading the macOS installer on the Mac computer, you need to install it onto the prepared USB drive. Or else, it will install on the computer you are using. Warning: If the Mac OS installer opens after downloading, you should quit it without continuing installation. How to get macOS installer files?Īfter finishing the preparations mentioned above, it's time to download your desired macOS installation files. If the target Mac can't support the Mac OS you've downloaded, it won't boot from the USB drive. Ensure the macOS you'll download is compatible with the Mac model that you'll boot. If you use M1 Mac, you should use a Thunderbolt 3 NVMe M.2 SSD.Ĥ. If you have modern Macs, you'd better use a USB 3 or USB Type C drive. Once the interface of the USB drive is not suitable for your Mac, it can't be detected or recognized by your Mac. Identify your Mac ports and make sure the USB drive is suitable. For names with over one word, the input format in the terminal is special.ģ. For later operations easier, you'd better set your drive or volume name with one word. That's because Mac OS Extended has higher compatibility among different OS versions and the OS installer requires such storage space to load.īy the way, to format a USB drive or partition a volume on a USB drive, go to Disk Utility. Prepare a clean USB flash drive or other secondary volume formatted as Mac OS Extended and with at least 32GB of storage (For macOS Big Sur, 64GB is better). A bootable USB drive should be created on a healthy Mac.Ģ. Here are what you should do before creating a bootable USB drive:ġ. So, you'd better follow this part carefully. The preparations listed below are very important as they decide whether you can create a USB installer successfully or not. What do you need to prepare for making a bootable USB for Mac?
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