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Short answer: A percentage is meaningful only with its denominator and scan scope.
By DiskAnalyzer editorial resource · Published 2026-10-05 · Documentation reviewed 2026-10-05
When this guide is useful
A 40 percent entry in a project-folder report can occupy only a small share of the disk. When sharing the finding, include the folder size and volume capacity so the recipient can assess its significance.
Recommended workflow
- Identify the scan root.
- Read the absolute size as well as the percentage.
- Check whether filters are active.
- Record the scope with the result.
Limits and precautions
A percentage from a folder scan is not necessarily a percentage of the whole drive.
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? | Record the scope with the result. |
| What could go wrong? | A percentage from a folder scan is not necessarily a percentage of the whole drive. |
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.
Related guides
- Size and Allocated: Which Number Should You Use?
- Compare Free Space with the WizTree Treemap
- Avoid Double Counting Hard Links in Disk Reports
- Find the Largest Files on a Windows Drive
Download information · How we verify guidance
Sources and verification
- WizTree developer documentation
- WizTree developer FAQ
- WizTree developer download notes
- Microsoft Windows storage guidance
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.