Freedom251 › Disk Health Monitoring Software

HDD Health Monitor

Free plan Windows

Visit HDD Health Monitor Alternatives Pricing

What HDD Health Monitor is

HDD Health Monitor is a free, open-source Windows utility that reads raw S.M.A.R.T. data from physical drives and presents health, estimated performance, warnings, and historical trends. It shows percentages for health and performance alongside a full S.M.A.R.T. attribute table. The app scans physical drives automatically and can monitor several at once, with separate tray icons and alerts. Notifications cover temperature, declining health, predictive failure, reallocated sectors, uncorrectable errors, and NVMe critical warnings. While running, it records health and selected attribute snapshots every five seconds and saves history between sessions. It supports ATA/SATA, M.2 SATA, NVMe, USB, and SCSI drives, although data availability depends on the drive and controller. USB drives are detected shortly after connection and removed from the selector and tray when unplugged. The standalone executable needs no installer or dependencies, but administrator privileges are required to read S.M.A.R.T. information. The software uses the MIT License, does not expire, and requires no registration.

Who it suits

It suits Windows users who want drive health monitoring, warnings, and saved S.M.A.R.T. history. Users should check whether their drive and controller expose the data the utility needs.

What it does well

Monitors multiple physical drives automatically.
Records selected health data every five seconds while running.
Provides several drive-health and failure alerts.
Runs without an installer or dependencies.
Free, MIT-licensed, and requires no registration.

What to know first

Administrator privileges are needed to read S.M.A.R.T. data.
USB bridge support can prevent S.M.A.R.T. access.
S.M.A.R.T. data usually cannot be read from unofficial flash drives, memory cards, or eMMC products.
Some Windows antivirus products may incorrectly flag it as malware.

Limits

Available S.M.A.R.T. data depends on the drive and controller. USB enclosures without supported pass-through may provide no data, and the maker says such data usually cannot be read from unofficial USB flash drives, memory cards, or eMMC products.

Plans

Plan	Billed and limits	Price
HDD Health Monitor	100% free · open-source · Windows utility	Free

As hddmonitor.github.io lists them, read 3 Oct 2026. The maker's own page has the final word.

Getting started

Open https://hddmonitor.github.io/.
Download and run the standalone executable; no installer or dependencies are required.
Grant administrator privileges so the utility can read S.M.A.R.T. data.
Review the automatically scanned physical drives and their health information.

Verdict

HDD Health Monitor brings drive health indicators, alerts, and retained history into a standalone Windows utility. Its ability to read S.M.A.R.T. data depends on drive and controller support, and it requires administrator privileges.

Questions

Is HDD Health Monitor free?

Yes. It is free, open-source software under the MIT License and does not expire or require registration.

Which Windows versions does it support?

The listed supported versions are Windows Vista, 7, 8, 8.1, 10, and 11.

What drive types does it support?

It supports ATA/SATA, M.2 SATA, NVMe, USB, and SCSI drives, though available data depends on the drive and controller.

Does it monitor drives remotely?

No. Remote monitoring is listed as unsupported.

Does it need installation?

No. It runs as a standalone executable without an installer or dependencies. Administrator privileges are required to read S.M.A.R.T. data.

Where can I get support?

The site provides documentation, bug reporting, and the email contact [email protected].

Facts from HDD Health Monitor's own pages

Alerts: Windows tray notifications cover temperature, declining health, S.M.A.R.T. predictive failure, reallocated sectors, uncorrectable errors, and NVMe critical warnings. · hddmonitor.github.io, 3 Oct 2026
Drive monitoring: Scans all physical drives automatically and monitors multiple drives simultaneously, with a separate tray icon and alerts for each. · hddmonitor.github.io, 3 Oct 2026
Drive support: Supports ATA/SATA, M.2 SATA, NVMe, USB drives, and SCSI drives, though available data depends on the drive and its controller. · hddmonitor.github.io, 3 Oct 2026
Health and performance: Shows per-drive health and estimated performance percentages alongside a full S.M.A.R.T. attribute table. · hddmonitor.github.io, 3 Oct 2026
History: Records health and selectable S.M.A.R.T. attribute snapshots every five seconds while running and saves history to disk between sessions. · hddmonitor.github.io, 3 Oct 2026
Hot-plug: Detects connected USB drives in about one to two seconds and removes their drive selector and tray icon when unplugged. · hddmonitor.github.io, 3 Oct 2026
License and expiration: The documentation says the software is free and open-source under the MIT License, does not expire, and requires no registration. · hddmonitor.github.io, 3 Oct 2026
Portable setup: Runs as a standalone executable without an installer or dependencies; administrator privileges are required to read S.M.A.R.T. data. · hddmonitor.github.io, 3 Oct 2026
Purpose: Reads raw S.M.A.R.T. data from physical drives and presents drive health information, warnings, and historical trends. · hddmonitor.github.io, 3 Oct 2026
Screenshots: Can save a PNG image of the main window to a HDDH_Screenshots subfolder in Documents. · hddmonitor.github.io, 3 Oct 2026
Security note: The maker warns that some Windows antivirus products may incorrectly flag the program as malware. · hddmonitor.github.io, 3 Oct 2026
Support: The site provides documentation, bug reporting, and an email contact at [email protected]. · hddmonitor.github.io, 3 Oct 2026
USB flash limitation: The maker says S.M.A.R.T. data usually cannot be read from unofficial USB flash drives, memory cards, and eMMC products. · hddmonitor.github.io, 3 Oct 2026
USB limitation: S.M.A.R.T. data may be unavailable when a USB enclosure bridge does not support pass-through or a supported protocol. · hddmonitor.github.io, 3 Oct 2026

Where HDD Health Monitor stands on Freedom251

Disk Health Monitoring Software#13 of 28