Now choose Disk Utility > Quit Disk Utility.(There are options under Security Options that allow you to erase the disk securely). (You won’t see the Scheme option if you only have the volume selected). You will also need to have GUID Partition Table selected as the Scheme. But on older Macs running older macOS versions the format needs to be set to Mac OS Extended (Journaled). In Catalina, Mojave, Big Sur, Monterey, and potentially High Sierra (depending on your Mac) this will be APFS. The next step also depends on the version of macOS you are running.Remember this is going to delete all your data so make sure you have your important data backed up or stored in the cloud or on an external drive. We cover how to do this here: How to wipe and reformat your Mac. You’ll need to delete the Data volume first and then Macintosh HD. If you are running Catalina or later there will be two volumes probably called Macintosh HD and Macintosh HD-Data (or possibly Home and Home – Data). If you aren’t running Catalina then you only need to delete the Macintosh HD volume. Note that the process here is slightly different if you are running macOS Catalina or Big Sur. You may need to click on View > Show All Drives before you can see the volume. Now select the volume you wish to Erase.
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