How to create a partition on your Mac to test High Sierra

How to create a partition on your Mac to test High Sierra

You can partition your Mac and boot another operating system alongside your current one.

If you’ve always wanted to partition your Mac’s hard drive so you can run a separate operating system — including macOS High Sierra — in tandem with your current one, it’s surprisingly easy to do so thanks to Apple’s built-in disk utility program. Here’s how to partition your Mac.

What is a disk partition?

Partitioning your Mac is basically splitting your hard drive into separate, usable systems. It makes it possible to run two separate operating systems on one device, like Windows and macOS, and even the macOS High Sierra beta.

Note: If you want to run Windows on your Mac, Apple’s Boot Camp assistant will automatically make a partition for you. Here’s how to install Windows.

It is important to note that partitioning your hard drive also splits up your available hard drive space. Each partition will take up a portion of your usable storage. So, if you are running low on storage capacity on your hard drive, we don’t recommend partitioning; try using an external drive, instead.

Before you start

The most important thing to do before making any changes to your hard drive is to back it up. Seriously. Back it up. Please. Time Machine is the easiest way to back up your data if you don’t already have another system in place.

Make sure you have enough free disk space to properly run a secondary operating system. Shoot for at least 30GB free.

How to create a partition on your Mac

  1. Open Finder from your dock.
  2. Select Applications.

    Selecting Applications in the Finder window on Mac

  3. Scroll down and open the Utilities folder.
  4. Double-click to open Disk Utility.

    Selecting the Disk Utility app on Mac

  5. Select your hard drive in the…

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