This is because the original macOS installation was on the startup disk you just erased.
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Learn how to reinstall macOS after erasing your DriveĪfter erasing or reformatting the startup disk-if that was your goal-you need to reinstall macOS before you can use your Mac again. Select Disk Utility from this window and try erasing or reformatting your drive again. You should see a macOS Utilities window appear. Recovery Mode appears as a Utilities window. Keep holding both keys until you see an Apple logo or hear a startup sound. When you’re ready to boot into Recovery Mode, restart your Mac and hold Cmd + R while it boots up. You should back up your Mac before trying to erase or reformat it. Recovery Mode is a special partition on your Mac you can use to restore from a backup, reinstall macOS, get online support, or erase your startup disk. It’s not usually possible to erase the startup disk because your Mac is using it to run macOS. The startup disk is the main hard drive on your computer: the one that stores macOS and all your data. If you’re trying to reformat or erase the startup disk on your Mac, you need to boot into Recovery Mode first. Boot Into Recovery Mode to Erase Your Startup Disk The length of time First Aid takes to run depends on the size of your drive, how much data is on it, and how many errors need fixing.Ĭombine this step with the previous one to run First Aid on the parent device for your drive, as well as the individual Volumes. At the top of the window, click the First Aid button, then agree to Run First Aid. Open Disk Utility and select the drive you want to erase from the sidebar. When you run First Aid, it scans the entire disk for errors and lets you know if there are any it can’t repair. Run First Aid to Repair Your Drive Before Erasing Itĭisk Utility has a First Aid feature that fixes all kinds of issues related to your drives: slow performance, corrupt files, or unexpected behavior. Take note that when you erase a device, it erases all the Volumes contained within it as well. Select the parent folder for the drive you want to reformat or erase, then click the Erase button again. You should see the device names for each of your drives appear in the sidebar. Open Disk Utility and select View > Show All Devices from the menu bar. A Volume is the partition or section of a drive you store data in.
Show All Devices and Erase the Parent Driveīy default, Disk Utility only shows the Volumes on your connected drives, rather than the drives themselves. Use the steps below to fix it and let us know in the comments which one worked for you. You’re probably reading this article because the Erase button was grayed out when you tried to erase or reformat a drive using Disk Utility. What if the Erase Button in Disk Utility is grayed Out? Wait for Disk Utility to erase or reformat your drive, then click Done.ĭisk Utility shows each process it completes in the window.Choose a new name and format for your drive, then click Erase.ĭecide what to name your drive after erasing it.Click the Erase button at the top of the window.ĭisk Utility presents several tools at the top of the window.In the sidebar, select the drive you want to erase or reformat.Spotlight is the quickest way to open Disk Utility. Open Disk Utility from the Utilities folder in your Applications.When you’re ready, here’s how to erase or reformat drives: So make sure to back up any important files before erasing or reformatting your drives. When you reformat a drive, it also erases all the data on it. Or you might need to reformat it so it works with different operating systems, like Windows, Linux, or even iPadOS. You may want to erase your drive as a quick way to create space for new files.
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Feel free to skip this section if you already know how to do it. Let’s start with a brief explanation of the correct way to reformat or erase drives using your Mac. How to erase or reformat a Drive using Disk Utility Learn how to reinstall macOS after erasing your Drive.Run First Aid to Repair Your Drive Before Erasing It Show All Devices and Erase the Parent Drive What if the Erase Button in Disk Utility is grayed Out?.
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