MacBook Air
Unable to reinstall macOS since it says no drives can be found, then went on Apple SSD to try to erase it into Mac OS extended format but it failed as there was a problem unmounting disk?
Take a look at the following articles to double-check that you didn't miss any steps to properly erase & re-install macOS on your notebook:
- How to reinstall macOS - Apple Support
- How to erase your Intel-based Mac - Apple Support
