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If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first.
#Clean install mac os sierra usb password
If the installer asks to unlock your disk, enter the password you use to log in to your Mac.To begin installation, select Reinstall macOS from the utilities window in macOS Recovery, then click Continue and follow the onscreen instructions.įollow these guidelines during installation: Reinstalling macOS does not remove data from your Mac.