Either click on the - button or go to the menu and choose Edit > Delete APFS volume.Click on this Macintosh HD - Data drive to select it.You should see two disks - Macintosh HD and Macintosh HD - data (shown below - sorry about image quality!) This new data drive in Catalina is where your data is stored separately to the macOS installation.(It's possible your drive is called something else, like Home HD for example).Once Recovery starts up choose Disk Utility.As per the step above, start up your Mac in Recovery by holding down Command + R as the Mac boots up.You do need to delete both, you can't cut corners. When you are reformatting your Mac in Catalina you first need to delete the Macintosh HD - Data volume before deleting Macintosh HD. The reason Apple separated the two volumes in Catalina is to ensure that critical operating system data can't be overwritten - but it means that if you want to make sure all traces of your data are removed from your Mac before selling it on, or because you want to do a clean install, you will need to wipe both volumes. ![]() Alongside it you will also have a Macintosh HD - Data volume. This volume is Macintosh HD (yours may have a different name). When Apple introduced macOS Catalina in 2019 it added a new read-only volume where the operating system lives.
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