The different color bands are categories to which your Mac assigns the files, including Apps, Documents, etc., with bands in different shades of gray used for ‘system’ items such as System (macOS files), Trash, and Other. One way to determine what is taking up space on your Mac is to use Apple menu > About this Mac > Storage tab. I’ll use one of my Mac notebooks, a 2017 15” MacBook Pro with a 500 GB SSD, as an example (even though I have plenty of storage available). In terms of your computer’s internal storage, that means at some point, no matter how much available internal storage you selected when you bought your Mac, eventually you may find that your drive is getting full and you need to free up space. Parkinson’s Law can be generalized to suggest demand always expands to match supply. For example, upgrading a MacBook Air via System Preferences required ~38 GB of free space, upgrading via Online Recovery required only ~27 GB free. Note 2: If your goal is to free up space to perform a MacOS upgrade, performing the same upgrade via Online Recovery mode (boot with Command-Option-R held) requires less space to be freed up. Note: Under MacOS 12 Monterey, the category "Other" has been changed to "System Data" but the following information still applies.
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