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Welcome to this tutorial on how to create a bootable USB drive for Mac OS! If you’re looking to install a fresh copy of Mac OS on your computer or to create a rescue disk, a bootable USB drive is a helpful tool. In this tutorial, we’ll guide you through the steps to create a bootable Mac OS USB drive. So, let’s get started!

Understanding a Bootable USB Drive

A bootable USB drive is a device that contains the necessary files for your Mac computer to boot. It is an essential tool for installing a new operating system or repairing an existing one. In this guide, we will show you how to create a bootable Mac OS USB drive step-by-step.

Before You Begin

Before creating a bootable USB drive, you need to prepare the following:

  • A USB drive with at least 8GB of storage capacity
  • A Mac OS installation file
  • A Mac computer
  • A stable internet connection

Make sure your USB drive is empty, as the process of creating a bootable USB drive will erase its content.

Step-by-Step Guide

Step 1: Download Mac OS Installation File

The first step is to download the Mac OS installation file. You can do this by visiting the App Store and searching for the desired version of Mac OS. Once you find it, click on the “Download” button, and the installation file will begin to download.

Step 2: Prepare the USB Drive

Insert your USB drive into your Mac computer and open the Disk Utility app. Select your USB drive from the list of available drives, and click the “Erase” button. Choose the format “Mac OS Extended (Journaled)” and click “Erase.” This process will erase all existing data on the USB drive.

Step 3: Create a Bootable USB Drive

With the Mac OS installation file downloaded and the USB drive formatted, it’s time to create a bootable USB drive. You can use the Terminal app to create a bootable USB drive with just a few commands.

  1. Open the Terminal app from the Applications > Utilities folder.
  2. Type the following command: sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ macOS\ Sierra.app --nointeraction
  3. Press Enter and wait for the process to complete.

Step 4: Install Mac OS

Once the bootable USB drive is created, it’s time to install Mac OS on your computer. Insert the USB drive into your computer and restart it while holding down the Option key. This action will bring up the Startup Manager, which will show you all available bootable drives. Select the USB drive, and the Mac OS installation process will begin.

FAQs for How to Make a Bootable Mac OS USB

What is a bootable Mac OS USB?

A bootable Mac OS USB is a storage device that has been correctly formatted and loaded with an operating system distribution, such as macOS. It can be used to reinstall or repair a system or to initiate a clean installation of macOS.

What do I need to make a bootable Mac OS USB?

To make a bootable USB, you’ll need a USB flash drive with a minimum of 8 GB of storage space, the latest version of macOS, an app called “Install Disk Creator,” which can be downloaded from the App Store or any other suitable bootable media creation tool. You also need a Mac computer capable of using the version of macOS you are planning to use.

How do I prepare my USB drive for the installation?

First, connect a USB flash drive to your Mac. Open the Disk Utility application, from the Applications > Utilities folder and select the USB drive in the left-hand sidebar. Next, click on the ‘Erase’ button and select ‘Mac OS Extended (Journaled)’ as the format and ‘GUID Partition Map’ as the scheme. Once the USB drive is formatted, you can close Disk Utility.

How do I create a bootable USB drive using Install Disk Creator?

To create a bootable USB drive using Install Disk Creator, you’ll need the latest version of macOS, an 8GB (or larger) USB flash drive, and a Mac you can borrow from somebody, assuming your current setup doesn’t work. Open Install Disk Creator, select the connected USB drive, then click on the ‘Select the OS X Installer’ option and choose the latest version of macOS available. Once you’ve chosen macOS, click the ‘Create installer’ button to begin the process. The app will ask to confirm the process, then take several minutes to finish.

How do I use a bootable USB drive to boot a Mac computer?

Insert the bootable USB drive into the Mac computer before restarting it. When the Mac starts up, hold down the ‘Option’ key until you see a list of all available bootable volumes. Select the USB drive, and your Mac will boot from it and allow you to install or reinstall macOS.

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