How to Check SSD Health in Windows

Where to look

Windows 11 shows basic drive health for some NVMe drives in Settings under Storage. For fuller detail, use a SMART-aware tool or the drive manufacturer utility, which can report wear, spare capacity, temperature, and error counts.

Values that matter

Different drives name values differently, but the important ideas are consistent.

• Percentage used or remaining life → estimated wear against rated endurance.
• Available spare → reserve blocks left to replace worn cells.
• Media and data integrity errors → uncorrectable errors; any growth is serious.
• Critical warning flags → the drive itself reporting a problem.
• Temperature → sustained high values can reduce performance and life.

Reading the numbers sensibly

A drive showing moderate wear is normal; SSDs are designed to wear. Rising media errors, falling spare capacity, or a critical warning are more important than a single wear number. Treat the report as an estimate, not a guarantee.

When to back up and replace

Back up regularly regardless of health. Replace a drive that reports critical warnings, growing media errors, or very low remaining life, and replace it sooner if the drive holds data you cannot recreate.

TWW diagnosis: health data is evidence, not a single green/red verdict

SSD health information is most useful when compared with symptoms. A drive can report healthy while another problem causes slow performance, and a drive showing wear information can still operate normally. Look at temperature, remaining life indicators where available, error information, capacity, and whether the drive is intermittently disappearing.

Back up important data before experimenting with a drive that is showing repeated errors or disappearing from firmware. Diagnostic work should never be allowed to become the reason valuable data is lost.

Use health data alongside symptoms and event logs

A single “good” status is not a promise that a drive cannot fail, and a wear percentage alone is not a complete diagnosis. Check the drive model and firmware, the manufacturer utility or a reputable SMART reader, temperature, critical-warning state, and whether media or data-integrity error counters are changing. Names and thresholds differ between SATA and NVMe devices and between vendors.

If Windows intermittently loses the drive, files become unreadable, or storage-related errors keep appearing, copy important data before running long benchmarks or stress tests. Performance testing is secondary when reliability is in question.

1. Identify the exact drive model and interface in Windows or the manufacturer utility.
2. Capture the current health report, temperature, and available error counters so you have a baseline.
3. Check Reliability Monitor and Event Viewer for storage or controller errors around the time of the slowdown.
4. Back up important files, then compare the symptom with free capacity, temperature, and background disk activity.
5. Repeat the same observation later; changes over time are often more useful than one isolated reading.