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How to Create a Bootable Installer for macOS

Creating a bootable installer for macOS has become a straightforward process since Mavericks. With just one command in Terminal, you can create a bootable copy of an installer on any drive connected to your Mac.

The `createinstallmedia` command requires OS X 10.7 Lion or later and does not work under OS X 10.6 Snow Leopard or earlier. Once you have the installation files, follow these steps to create a bootable installer.

Step 1: Download the Installation Files

To get started, download a disk image named InstallOS.dmg from Apple's website. This will contain the pkg installer that you need for the next stage of this tutorial. Note that you may see a warning asking for confirmation when downloading the software if you are already running it.

Step 2: Create a Bootable Installer

Once you have downloaded the disk image, locate the pkg installer inside and copy it to an external drive or USB thumb drive. Make sure the drive is at least 8GB in size.

If you're using an M1 Mac, you may want to consider using a Thunderbolt drive instead of a USB drive due to compatibility issues.

Important: Backup Your Data

Before creating the bootable installer, make sure you have backed up any important data on the drive you plan to use. The drive will be completely formatted and erased during the installation process.

Read our article on how to get older versions of macOS if you're looking for a specific version that's no longer available from Apple's website.

Creating a bootable installer for macOS is a simple process that requires just one command in Terminal. By following these steps, you can create a bootable copy of an installer on any drive connected to your Mac. Make sure to backup your data before proceeding and consider using a Thunderbolt drive if you have an M1 Mac.

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