No one needs to tell you formatting your Mac's drive entails reinstalling the macOS afterward, right? As long as you're aware of that, you're good to go. Apple has given you several options to choose from should you ever need to format or reformat your drive. The simple reason you might want to completely wipe your Mac's internal drive is that it has encountered one serious error or another.
Part 4: How to Fix Errors When Formatting Mac Hard Drive. Part 3: Different Formats of Mac Hard Drive. Part 2: When You Need to Format Disk on Mac. If you want to start up again from the disk you just erased, select Reinstall macOS in the utilities window, then click Continue and follow the onscreen instructions to reinstall macOS. 
After your Mac activates, click Exit to Recovery Utilities. Use the Wi-Fi menu in the menu bar to choose a Wi-Fi network, or attach a network cable. Your Mac now attempts to activate, which requires an internet connection. When your Mac restarts, follow the onscreen instructions to choose your language. When asked whether you're sure you want to erase this Mac, click Erase Mac and Restart. Click Erase. However, if you see an Erase Volume Group button, click that button instead. Click the Erase button in the toolbar, then specify a name and format:. Now select Macintosh HD in the sidebar. 
If you previously used Disk Utility to add volumes to your startup disk, select each additional internal volume in the sidebar, then click the delete volume (–) button in the toolbar to delete that volume.ĭuring this step, disregard any internal volume named Macintosh HD or Macintosh HD - Data, as well as any volumes in the External and Disk Images sections of the sidebar. In the Internal section of the Disk Utility sidebar, make sure that you see the volume named Macintosh HD. From the utilities window, select Disk Utility and click Continue. If asked, enter the Apple ID and password previously used with this Mac. If asked, select a user you know the password for, then enter their administrator password. 
Turn on your Mac and continue to press and hold the power button until you see the startup options window.
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