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Windows · SpaceSniffer 2.2.0.27

How to Read the SpaceSniffer Treemap

Quick answer: Rectangle area represents file or folder size: larger blocks account for more of the scanned storage.

Use this workflow on an authorized Windows 10 or Windows 11 computer. SpaceSniffer shows a size-proportional view of storage; always inspect the source file in Windows before changing or deleting it.

Step-by-step workflow

  1. Start a scan.
  2. identify the largest root rectangles.
  3. click a block to see details.
  4. double-click to zoom into its contents..

How to verify the result

A large block can be traced from volume to folder to individual files.

Important limitationColor and shape do not determine whether a file is safe to delete.

Why this matters

SpaceSniffer is a visualization tool, not a diagnosis of file necessity. The important outcome is an identifiable path and measurable file size, checked against the same Windows volume and with permission to inspect it. If the scan is incomplete, report that limitation instead of treating missing paths as zero bytes.

More targeted troubleshooting

If the result differs from what File Explorer reports, clear the filter field, allow scanning to finish and check the permissions of the specific directory. Repeat on a smaller known folder when you need to isolate a scanning limitation. Always distinguish a changed treemap view from an actual change in free space.

Frequently asked questions

What is the first step for how to read the spacesniffer treemap?

Start a scan.

How do I check the result?

A large block can be traced from volume to folder to individual files.

What should I avoid?

Color and shape do not determine whether a file is safe to delete.

Related Windows topics

Sources and further reading

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