Worried that your Mac’s drive might be filling up? Or perhaps you want to see how much space you’re using as you research buying a backup drive or a new Mac. Regardless, Apple provides a quick and informative way to see how your drive is being used. Click the Apple menu, choose About This Mac, and click the Storage tab. The display tells you how big your drive is, how much space is free, and most interestingly, what types of files occupy the most space. Hover over one of the colored bars to see a pop-up that tells you exactly how much space it takes.