What the scan shows
Files counted, allocated size, elapsed time, current folder and large folders found so far. The final total is unknown before the scan finishes, so no misleading completion percentage is shown.
Why totals differ from Finder
APFS snapshots, clones, metadata, inaccessible folders and purgeable data can cause file totals to differ from volume allocation. A stopped scan is explicitly partial.
Is this safe?
Scanning reads metadata and does not delete files. You can stop it at any point.
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