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Message: <blockquote data-quote="MacInWin" data-source="post: 1827884" data-attributes="member: 396914">All of that tells me you are still booting from the drive somehow. I would try an internet recovery. Here is the Apple article on recovery: <a href="https://support.apple.com/en-us/HT204904" target="_blank">How to reinstall macOS from macOS Recovery - Apple Support</a>From that article, you would use either Option-cmd-r or Shift-Opton-cmd-r to hold down during boot. You should get to the screen shown in the article, from where you can run Disk Utility and reformat the hardware drive, then create a partition on it and then install macOS. Because both of those boots are over the internet and not from the internal drive, the drive should never mount, and therefore never need unmounting.</blockquote>