In this post, you will get how to erase disk for mac. Depending on whether you want to erase the Boot disk or some other disks to continue the operation. A boot disk is the disk (volume) that the Mac uses when it boots. By default, it is the Mac’s built-in disk and is called “Macintosh HD.” If you want to sell, give away, or discount a Mac, you should erase the boot disk.
Step 1: Turn on your Mac and simultaneously press and hold the Command + R key. When you see an Apple logo and sinning globe, release the two keys.
Step 2: You will be prompted that you should enter the administrator password to continue the operation. And when the Startup is complete, you will see the macOS Utilities window.
Step 3: In the macOS Utilities window, choose the Disk Utility option and click Continue.
Step 4: In the Disk Utility menu bar, click View > click Show All Devices. You then will see all your disks and all containers and volumes within them on the sidebar. The boot disk is the so-called Macintosh HD unless you ever renamed your disks.
Step 5: Find a volume with the same name “Data”, such as “Macintosh HD-Data.” If you have such a volume, please select it. Then, select edit from the menu bar > select “delete APFS volume.” Or click the Delete Volume button (-) in the Disk Tools toolbar.
Step 6: When prompted for confirmation, click the Delete button.
Please note: Do not click “Delete Volume Group”. Do the same operation to remove any other volume that might exist on the boot disk, except for the volume named “Macintosh HD.”
Step 7: After deleting all data volumes, select “Macintosh HD” in the sidebar.
Step 8: Click the “Erase” button or the TAB and fill in the following:
Name: Enter the name you want the volume to use when it is erased, such as “Macintosh HD”
Format: Select “APFS” or “Mac OS Extensions (journaling)” as the format for the Mac volume. By default, Disk Utilities displays the recommended Mac format.
Step 9: Click Erase to begin wiping the disk. You may be prompted for an Apple ID.
When you are done, exit Disk Tools to go back to the macOS Utilities window.
f you want your Mac to be able to boot from this volume again, select Reinstall macOS from the Utilities window, and then follow the on-screen instructions to reinstall macOS on the volume. If you do not reinstall the macOS, the Mac may boot with a flashing question mark (?). .
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