![]() Name: Type the name that you want the disk to have after you erase it.Click Erase, then complete these items:.Select the disk that you want to erase.In this example, Apple SSD is the startup disk: The disk your Mac started up from is at the top of the list. ![]() ![]() The sidebar now shows your disks (devices) and any containers and volumes within them. Choose View > Show All Devices from the menu bar in Disk Utility.If you're not erasing the disk your Mac started up from, you don't need to start up from macOS Recovery: just open Disk Utility from the Utilities folder of your Applications folder. Then select Disk Utility from the Utilities window and click Continue. Before continuing, make sure that you have a backup of any files that you want to keep. Erasing a disk or volume permanently deletes all of its files.
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