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In that case, you should erase the volume group. If you see an Erase Volume Group button, the volume you selected is part of a volume group.Name: Type the name that you want the volume to have after you erase it.The volume your Mac started up from is named Macintosh HD, unless you changed its name. In the sidebar of Disk Utility, select the volume that you want to erase.If you're not erasing the volume 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. If you want your Mac to be able to start up from the disk you erased, reinstall macOS on the disk.You might be asked to enter your Apple ID. Click Erase to begin erasing your disk and every container and volume within it.Disk Utility shows a compatible format by default. Format: Choose APFS or Mac OS Extended (Journaled).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. Connecting External Hard Drives: External hard drives can be any size, ranging from portable USB. Compare the different options for formatting an external hard drive to work with Windows and Mac. The best ways to format an external drive for Windows and Mac.