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HDDScan vs Hard Disk Sentinel: catalog facts
HDDScan	Hard Disk Sentinel
Free Freeware with no paid edition.	Freemium A limited free version exists. The Professional edition is a paid licence.
Windows	Windows, Linux
Surface tests in read, verify and erase modes Shows SMART attributes and drive temperature	Health and estimated lifetime per drive rather than raw S.M.A.R.T. values Sees drives behind many USB enclosures and RAID controllers
Windows only RAID volumes and USB flash drives get surface tests only	The free version is limited; most features need the paid Professional edition
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.