Compare Free Space with the WizTree Treemap

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Short answer: Use the volume's free-space figure to track actual capacity while using the treemap to investigate file distribution.

By DiskAnalyzer editorial resource · Published 2026-10-05 · Documentation reviewed 2026-10-05

When this guide is useful

If a filtered view hides operating system folders, the visible rectangles describe the remaining results. Do not present that map as a complete accounting of the volume when reporting available storage.

Recommended workflow

Note available space in Windows.
Inspect the scan's drive summary.
Check the treemap display options.
Rescan after a cleanup operation.

Limits and precautions

Filtered file results do not represent all allocated storage.

Keep a useful record

Record the drive or folder, scan time, application version and the measurement you used. Keep observations separate from proposed changes. If a result leads to a cleanup, record the file owner, backup status and actual free-space change. This makes the result easier to review and helps explain differences in a later scan.

Quick review checklist

Question	What to record
What did you inspect?	The exact volume or folder, not just the PC name.
What action is justified?	Rescan after a cleanup operation.
What could go wrong?	Filtered file results do not represent all allocated storage.

Next steps

If the result is unclear, preserve the current report and narrow the investigation to one folder or application. Make one approved change at a time, then repeat the relevant measurement. Avoid presenting a predicted saving as a measured outcome.

Sources and verification

Prepared from public documentation and practical storage-audit reasoning. No hands-on Windows test or independent binary inspection was performed for this publication. Menu names and package requirements can change; check the developer documentation for your installed version.