The Mac OS supports both a left-click and a right-click for the mouse. How a Mac and a Windows-Based PC Are Different. If you run into the issue of not having enough. In this video tutorial, I show you how to easily format an external hard drive to work on both a Mac and a PC. How do I format my Mac High Sierra? What should I do to make it entirely new? ' 'I am thinking about selling my Mac and it has personal data on it.