Choosing free data recovery software requires more than comparing download speeds. Ask what the scan actually proves.
NIST SP 800-88 frames sanitization through Clear, Purge, and Destroy methods. A quick scan usually reads file-system records and recently deleted entries. It can reveal filenames, folders, and usable fragments within minutes.
A deep scan searches raw sectors and file signatures. It may find photos without names, broken documents, or scattered text. These results measure recoverability, not secure erasure.
That distinction matters. Recovery software can test whether data remains accessible after a sanitization process. It cannot certify that every storage area is clean.
NIST guidance also emphasizes verification and validation. For a fair test, use a disposable drive containing ordinary sample files. Record the quick-scan results, then run the deep scan. Save screenshots and logs without writing new data to the tested device. Small details matter.
Solid free tools should show scan modes, recovered file quality, and clear error messages. They should also support read-only scanning where possible.
A deep scan can produce impressive results but still miss hidden areas, especially on modern solid-state storage.
My own evaluation mistake was treating “no files found” as proof of destruction. It was only evidence from one tool. Check with another method, inspect the device type, and match the result to the specific NIST sanitization goal.