. Select Disk Utility from the Utilities window in macOS Recovery. Then click Continue. Make sure that the sidebar in Disk Utility shows the name of your startup disk. The volume representing your startup disk is Macintosh HD, unless you renamed it. Look for a ”Data” volume with the same name, such as ”Macintosh HD - Data.” If you have such a volume, select it.
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Then choose Edit Delete APFS Volume from the menu bar, or click the delete volume button (–) in the Disk Utility toolbar.When you're asked to confirm, click the Delete button. Do not click Delete Volume Group. Do the same to delete other volumes you might have on your startup disk—except the volume named Macintosh HD.
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After deleting any Data volumes, select Macintosh HD in the sidebar. Click the Erase button or tab, then complete these items:. Name: Enter a name that you want the volume to have after you erase it, such as Macintosh HD. Format: Choose either to format as a Mac volume. Disk Utility shows the recommended Mac format by default.
Launch the Disk Utility app on your Mac and highlight the hard drive icon under ‘ External’ (for external hard drives). If you choose any other drive, the partition option will become unclickable. Now click Partition on the top toolbar. A window that has partition information will pop up.
Click Erase to begin erasing. You might be prompted to enter your Apple ID. When done, quit Disk Utility to return to the Utilities window. If you want your Mac to be able to start up from this volume again, choose from the Utilities window, then follow the onscreen instructions to reinstall macOS on the volume. If you don't reinstall macOS, your Mac might start up to a flashing question mark (?).
In some circumstances, you might need to change the partition map (scheme) while erasing. If you're following instructions that require choosing a scheme, the steps in Disk Utility differ from the steps above. After opening Disk Utility, choose View Show All Devices from the menu bar. The sidebar now shows not just volumes, but also the disks (devices) that contain those volumes. In the following example, APPLE SSD is the disk, Container disk1 is a container on that disk, and Macintosh HD is a volume in that container. You can erase a disk or volume at any time, including in circumstances such as these:. You want to quickly and permanently erase all content from your Mac and restore it to factory settings, such as when you're.
You're changing the format of a disk, such as from a PC format (FAT, ExFAT, or NTFS) to a Mac format (APFS or Mac OS Extended). You received a message that your disk isn't readable by this computer. You're trying to resolve a disk issue that Disk Utility can't. The macOS installer doesn't see your disk or can't install on it. For example, the installer might say that your disk isn't formatted correctly, isn't using a GUID partition scheme, contains a newer version of the operating system, or can't be used to start up your computer. The macOS installer says that you may not install to this volume because it is part of an Apple. If you want to change the format, answer these questions:Are you formatting the disk that came built into your Mac?If the built-in disk came APFS-formatted, don't change it to Mac OS Extended.Are you about to install macOS High Sierra or later on the disk?If you need to erase your disk before installing High Sierra or later for the first time on that disk, choose Mac OS Extended (Journaled).
During installation, the macOS installer decides whether to automatically convert to APFS—without erasing your files.Are you preparing a Time Machine backup disk or bootable installer?Choose Mac OS Extended (Journaled) for any disk that you plan to use with or as a.Will you be using the disk with another Mac?If the other Mac isn't using High Sierra or later, choose Mac OS Extended (Journaled). Earlier versions of macOS don't mount APFS-formatted volumes.Disk Utility tries to detect the type of storage and show the appropriate format in the Format menu. If it can't, it chooses Mac OS Extended, which works with all versions of macOS.
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Disk Utility User Guide
You can use Disk Utility on your Mac to manage internal disks and external storage devices. Using Disk Utility, you can:
See alsoAdd, delete, or erase APFS volumes in Disk Utility on MacFile system formats available in Disk Utility on MacGet detailed information about a disk in Disk Utility on MacRepair a storage device in Disk Utility on MacErase and reformat a storage device in Disk Utility on Mac
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January 2023
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