Partition map repair

Hi IHSJr,

Try these steps to describe your disk layout:

1. Start up from macOS Recovery: Hold down Command-R as you power on or restart your Intel-based MacBook Air. Release the keys when the Apple logo and a progress bar appear, or when a spinning globe appears. You might be prompted to connect to Wi-Fi in the latter case.
2. If prompted, enter your administrator password to continue.
3. At the top of the screen, select Utilities -> Terminal.
4. Type this command and hit Enter (Return): diskutil list
5. Post the output here. If more than 7 disks appear, only the first 7 are needed.

Also, does the output provided match what you expected? If not, what would the expected output look like?

What exactly are you trying to do? Reinstall the existing OS or erase the drive and reinstall the OS to a clean drive?