Ranges are typical values from our own testing, not guarantees. Your mileage depends on usage.
Because "System Data" tells you nothing. macOS lumps every cache, snapshot and leftover into one grey bar, and most people assume the only fix is reinstalling macOS. In reality, an AI-tool power user's Mac almost always hides 15-60 GB of safely deletable data across a dozen known locations — the same locations our guides document one by one.
The guides linked above walk through each location with copy-paste commands, in the safe order we recommend: caches first, developer debris second, AI-tool data third. When you would rather see the whole disk mapped visually, our DaisyDisk comparison covers the paid and free options, and the System Data breakdown explains why the number macOS shows you is never the whole story.
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