You may want to erase your drive as a quick way to create space for new files. 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 Factory Reset MacBook Air and Other Macs With macOS.The Startup Disk Is Almost Full on My Mac But I Can’t Delete Anything.Mac or MacBook Doesn’t Recognize External Drives, Troubleshooting Tips.If your MacBook’s Disk Utility won’t let you erase drives, follow the steps below to fix it. This might happen for a variety of reasons, all of which keep you from erasing or reformatting the drives connected to your Mac. Just press and hold the power button on your Mac until it turns off.You can’t reformat a drive in macOS Disk Utility when the Erase button is grayed out. If you're selling, giving away, or trading-in your Mac and want to leave it in an out-of-box state, don't use the setup assistant or your previously connected Bluetooth devices, if any. After restart, a setup assistant guides you through the setup process, as if you're setting up your Mac for the first time.After joining a network, your Mac activates.To select a Wi-Fi network, use the Wi-Fi menu in the upper-right corner of the screen. You might be asked to select a Wi-Fi network or attach a network cable.When reconnecting to a Bluetooth keyboard, you're asked to choose a language. If the accessory doesn't connect within 30 seconds, turn the accessory off and back on. If it needs to reconnect to a Bluetooth accessory such as a keyboard or mouse, you might be asked to turn on the accessory. Your Mac restarts and shows a black screen or progress bar.Click Erase All Content & Settings to confirm that you want to proceed.If you're asked to sign out of Apple ID, enter your Apple ID password and click Continue.Click Continue to allow your settings, media, data, and the other listed items to be removed.Or click Continue to proceed without making a new backup. If you're asked to back up your Mac before resetting it, you can open Time Machine and back up to an external storage device.Enter the password that you use to log in to your Mac, then click OK.
An erase assistant asks you to sign in with your administrator credentials.After choosing Erase All Content and Settings, follow these steps to continue:
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