Windows 11 SSD Health: Warnings and Life Estimate

A Windows alert that an NVMe SSD’s reliability is degraded deserves attention—even if “Estimated remaining life” looks high. Back up important files from the affected drive before running diagnostics or changing firmware. Microsoft recommends backing up after a critical storage notification , and Windows’ built-in health page covers NVMe SSDs rather than SATA SSDs or hard drives.

This guide reflects information available by 2 March 2026. Menu wording and the health data a drive reports can vary by Windows version, computer and SSD.

Open the drive’s health page

1. Press Windows + I to open Settings.
2. Select System > Storage > Advanced storage settings > Disks & volumes.
3. Select the drive you want to check, then choose Properties. If Windows has shown a health notification, selecting that notification should open the same details.

Check the drive’s model and capacity before acting. A PC can have more than one SSD, and the Windows drive letter alone may not make the physical device obvious.

In a September 2020 Windows 10 Insider Preview announcement , Microsoft described NVMe health notifications as a way to flag hardware abnormalities and advised users to back up immediately after an alert. The Microsoft Support warning guide groups the critical warnings like this:

Spare capacity is low

The drive’s reserve is below the threshold set by its manufacturer. This is separate from how much file space is free.

What to do: Back up your files, then check the drive maker’s diagnostic and support guidance.

Reliability is degraded

Windows reports significant media errors or an internal NVM-subsystem error.

What to do: Treat this as a reason to back up now, even if the life estimate appears healthy.

Drive is set to read-only

Files may still be readable, but Windows cannot write to the drive.

What to do: Copy your most important readable files to another device first. Verify the copies before troubleshooting.

These are device-health warnings, not ordinary “disk almost full” messages. A storage-cleanup tool cannot resolve a hardware warning.

What the health numbers tell you

Estimated remaining life sounds like a countdown, but it is not a date or a promise of how many months the SSD will keep working. Microsoft describes the value as an approximate percentage used, based on the manufacturer’s prediction of drive life. The NVMe specification likewise defines percentage used as an implementation-specific estimate based on actual use and the manufacturer’s prediction. At 100%, the estimate says the drive’s rated endurance has been consumed; the specification says that alone may not mean the subsystem has failed, and the figure can exceed 100%.

Read the number as a wear estimate. It cannot tell you when a particular drive will fail. Do not dismiss a separate reliability warning because the percentage looks high, and do not use the percentage alone as a diagnosis.

Available spare is a normalised percentage of the remaining reserve capacity inside the drive. It is not free space for photos, games or Windows updates. The manufacturer sets the threshold that can trigger the low-spare warning.

Temperature is the drive’s reported overall temperature in degrees Celsius. Compare it with guidance for the exact SSD model; there is no single temperature in this Windows panel that diagnoses every drive. A normal reading also cannot cancel a separate critical warning.

The names and values come from drive health information, so manufacturers and models can report them differently. These fields are useful context, not a guarantee that a drive is safe.

What to do after a critical warning

1. Copy irreplaceable files to separate storage. Use another physical drive or a trusted backup service. If the SSD is still readable, copy the most important files first.
2. Check that the backup works. Open a few copied files from the destination. A completed progress bar does not prove that a useful copy was made.
3. Then contact the PC or SSD manufacturer. Provide the exact warning, drive model and any diagnostic result. Ask about the manufacturer’s recommended test, warranty and replacement options.
4. Get specialist help if files cannot be read. If the data is valuable and copying produces errors, stop experimenting with repair utilities and ask a reputable data-recovery provider about next steps.

The backup is the first priority because the warning describes the drive, while the life estimate is only an estimate. Avoid changing firmware or running repair operations until your important files are safe.

If Windows shows no health details

Windows documents this panel for NVM (NVMe) SSDs; it does not monitor SATA SSDs or hard disk drives through this health view. If your device is SATA or a hard drive, use the manufacturer’s own diagnostics. If the expected page or a value is missing, treat that as no reading, not proof that the drive is healthy.

Sources

• Microsoft, “What to do about a critical warning for a storage device” (Microsoft Support snapshot available 3 February 2026; current Microsoft page ).
• Microsoft, “Announcing Windows 10 Insider Preview Build 20226” (30 September 2020; documents the NVMe health notification and backup advice).
• NVM Express, Management Interface Specification, Revision 2.0 (ratified 5 August 2024; defines the percentage-used and available-spare estimates).