![]() Use the Disk Utility option to erase/format the external USB drive (NOTE: This means you will lose all data on it.Boot up into macOS Recovery using one of the options above.shift option command R to reinstall the macOS that came with your Mac, or the version closest to it that is still available.option command R to upgrade to the latest macOS that is compatible with your Mac. ![]() command R to reinstall the latest macOS that was installed on your Mac, without upgrading to a later version.More specifically, you have the following macOS Recovery options: If you have an external USB hard drive, you can start up from macOS Recovery to format it and install macOS. If you have a backup, then probably the easiest thing to do is create a bootable external drive, boot your Mac up from that, and then delete files from the internal drive. The first thing to do is backup your data, although if you were migrating from the PC to the Mac, then you've probably already got an original copy there anyway. ![]()
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