Troubleshooting & messages · Free space and clean-up messages
Why does it say measuring stopped early to stay out of my way?
Short answer: Measuring yields to your work, so it stopped before reaching every folder and totals may be low. It tries again when your Mac is quieter, or refresh while the Mac is idle.
Storage Studio is built to stay invisible while you work. If measuring your folders started to compete with what you were doing, it stopped early — so some folders weren't reached and the totals may be low.
It will measure again later when your Mac is quieter. To get a full reading now, leave your Mac idle for a few minutes and refresh.