With your USB drive plugged in, start up your Mac from macOS Recovery If your budget allows, a flash drive larger than 16 GB certainly won't hurt.How to Format Your USB Flash Drive Make sure whatever USB drive you select is formatted as Mac OS Extended.If it's not already in the right format, here's how to format your USB flash drive: All data on your flash drive will be erased. It's a great emergency backup tool to have on hand if anything happens to your existing startup drive.The information here covers creating emergency bootup USB drives for macOS Catalina,macOS Mojave,macOS High Sierra, and OS X El Capitan.Choose and Format Your USB Flash Drive Apple recommends using at least a 12 GB flash drive as a bootable installer, but a 16 GB flash drive might be worth the extra money.A 16 GB flash drive is big enough to install a complete copy of the macOS along with recovery utilities, such as Data Rescue, Drive Genius, and TechTool Pro, that you'd find helpful in an emergency bootup situation.
Go toApplications > Utilities>TerminalĮnter the command needed to put the installer on the USB drive.You can find it in the article below.Follow the on-screen prompts to finish the installation, then quit Terminal and eject the USB drive.This article explains how to create a bootable copy of OS X or macOS and put it on a USB flash drive. How to Create an Emergency Mac OS Boot Device Using a USB Flash Drive GASREGULAR Menu Lifewire Tech for Humans Newsletter! Search Close GO Computers, Laptops & Tablets > Apple How to Create an Emergency Mac OS Boot Device Using a USB Flash DriveUse this backup tool to reinstall your operating system By Tom Nelson Tom Nelson Writer Tom Nelson is an engineer, programmer, network manager, and computer network and systems designer who has written for Other World Computing,and others.Tom is also president of Coyote Moon, Inc.A Macintosh and Windows consulting firm.Lifewire's editorial guidelines Updated on FebruTweet Share Email Tweet Share Email Apple Macs iPad What to Know Download Catalina, Mojave, or High Sierra and connect a formatted USB drive to your Mac. How to Create an Emergency Mac OS Boot Device Using a USB Flash Drive
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