Boot disk utility from startup mac

You set your Mac or Macbook which disk to start up from when more than one startup disk is connected. You can set your Mac to automatically use a specific startup volume, or you can temporarily override this choice at startup.

Run First Aid From Your Recovery Partition

The next time you start up or restart your computer, your Mac starts up using the operating system on the selected volume. If you have an optical drive connected to your computer, you can insert an installation disc to see it in Startup Manager. You can also attach FireWire or USB external hard drives that contain an operating system to add to the list of startup volumes. A fully encrypted computer with anonymous browsing, ready to use.

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How to choose a startup disk on your Mac to boot from USB You set your Mac or Macbook which disk to start up from when more than one startup disk is connected. Set the default startup disk You can change the startup disk your Mac automatically uses from System Preferences. You'll need to put your Mac into macOS Recovery, which gives you tools to diagnose problems on your Mac, as well as reinstall the operating system.

You can enter Recovery by pressing certain key combinations. The combination you choose will determine which version of macOS will be installed on your system when you select Reinstall macOS.


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The first thing you'll want to do is make sure your Mac's startup disk is healthy. You'll need to use Disk Utility to do that. If you need to start completely fresh, then you'll want to erase your startup disk using Disk Utility. If you want the content on your Mac to stay intact, skip to the next section.

Your Mac will now go through the normal macOS installation process, eventually restarting. If you're starting from scratch, you'll need to set up your Mac from scratch. How to set up and customize your Mac from scratch. If you have any more questions about reinstalling macOS on your Mac, let us know in the comments. What would it be like if a dog manned the International Space Station? Excited for your new AirPods Pro?

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Joseph Keller is a senior writer at iMore. An Apple user for more than a decade and a half, he spends his time learning the ins and outs of iOS and macOS, always finding ways of getting the most out of his iPhone, iPad, and Mac. Skip to main content. Black Friday at Dell: Check out the best deals now! Forums Shop Toggle Search. Here's how to reinstall macOS using Recovery mode.

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Press Command - R to install the latest version of macOS that was installed on your Mac without installing a later version. Press Shift - Option - Command - R to install the version of macOS that came with your Mac, or the version closest to it that's still available.

Repair Boot Disk in Mac OS X with Disk Utility & Recovery HD

How to check your startup disk with Disk Utility in macOS Recovery mode The first thing you'll want to do is make sure your Mac's startup disk is healthy. Click Continue.

Click on your Mac's startup drive in the Disk Utility sidebar. It should be the drive at the top of the sidebar if there are multiple drives.