How to Tell If Your SSD Is About to Fail

This guide walks you through the warning signs of a failing solid-state drive (SSD), the built-in tools you can use to check its health, and what to do before it dies. You’ll need access to your computer’s operating system and a few minutes to run diagnostic commands.

What You’ll Need

• Your computer with the SSD installed
• Administrator access (to run some diagnostic tools)
• Optional: a USB enclosure or SATA-to-USB cable if you want to test the drive on another machine

Step-by-Step

1. Back up your data immediately. If you suspect any issue, copy important files to an external drive or cloud storage. This is the single most critical step; SSDs can fail without much warning.
2. Check for common warning signs. Notice if your system is freezing, crashing, or showing the Blue Screen of Death (BSOD) more often. Files that suddenly become read-only, applications that take a long time to load, or a drive that disappears from the file manager are all red flags.
3. Open your operating system’s drive health tool. On Windows, open a Command Prompt as administrator and type wmic diskdrive get status and press Enter. If it says “OK,” the drive is reporting healthy. On macOS, go to Applications > Utilities > Disk Utility, select your SSD, and check the SMART status at the bottom of the window. On Linux, install smartmontools and run sudo smartctl -H /dev/sda (replace sda with your drive identifier).
4. Read the SMART attributes. SMART (Self-Monitoring, Analysis, and Reporting Technology) data gives detailed health metrics. On Windows, use wmic diskdrive get model,status for a basic check, but for raw attributes, you’ll need a third-party tool like CrystalDiskInfo (free). On Linux, run sudo smartctl -a /dev/sda. Look for attributes like Reallocated Sector Count (should be 0 or very low), Uncorrectable Error Count (should be 0), and Wear Leveling Count or Media Wearout Indicator (a percentage; when it approaches 100% worn, the drive is nearing end of life).
5. Check the drive’s total bytes written (TBW). SSDs have a rated lifespan measured in terabytes written. You can find this in CrystalDiskInfo or smartctl under Total Host Writes or Data Units Written. Compare it to your drive’s rated TBW (usually printed on the label or the manufacturer’s website). If you’ve used 80% or more, plan to replace it soon.
6. Run a drive self-test. In smartctl, use sudo smartctl -t short /dev/sda and then sudo smartctl -l selftest /dev/sda after a few minutes to see results. On Windows, CrystalDiskInfo has a “Self-Test” button. A failed or aborted test is a strong indicator of imminent failure.
7. Listen for odd behavior (but not sounds). Unlike hard drives, SSDs have no moving parts, so they don’t click or grind. The only sound you might hear is from the system’s fan speeding up due to a failing drive causing high I/O. If the drive becomes extremely hot to the touch, that can also be a sign.
8. Test file transfer speeds. Copy a large file (e.g., 5 GB) from the SSD to another drive. If the speed drops dramatically mid-transfer or the operation fails, the NAND flash may be struggling.
9. Check the event log. On Windows, open Event Viewer, go to Windows Logs > System, and filter for sources like disk, ntfs, or stornvme. Look for warnings or errors such as “The device has a bad block” or “The driver detected a controller error.” On Linux, run dmesg | grep -i error to see recent kernel messages about the drive.
10. If any test fails or you see critical warnings, replace the SSD. Do not wait for it to die completely. Clone the drive to a new one using free software like Clonezilla or Macrium Reflect (Windows), or use dd on Linux if you’re comfortable with the command line.

Common Mistakes

• Ignoring the backup step. Many people wait until they see errors before backing up, but by then it may be too late.
• Misreading SMART percentages. Some tools show “health percentage” as 99%, but that’s not a linear measure. A 99% health SSD can still fail tomorrow if it has a controller issue.
• Confusing “OK” status with “no problems.” A drive can report SMART status OK while having a few reallocated sectors that will eventually cause trouble.
• Using defragmentation tools. Never defragment an SSD. It wears out the flash and provides no benefit. Windows automatically disables defrag for SSDs, but third-party tools might not.

Tips

• Enable TRIM if it’s not already. On Windows, run fsutil behavior query DisableDeleteNotify; if it returns 1, run fsutil behavior set DisableDeleteNotify 0. On macOS and most Linux distros, TRIM is enabled by default.
• Keep your SSD firmware updated via the manufacturer’s tool (e.g., Samsung Magician, Crucial Storage Executive). Firmware updates can fix bugs that cause premature failure.
• Leave at least 10–15% of the drive empty. SSDs need free space for wear leveling and garbage collection.
• Use a UPS (uninterruptible power supply) to prevent sudden power loss, which can corrupt the drive’s mapping table.

Troubleshooting

What if the SMART status is “OK” but I still suspect a problem? Run a long self-test (sudo smartctl -t long /dev/sda) which can take hours. Also check the drive’s temperature; if it exceeds 60°C (140°F) under load, it may be overheating, which can cause intermittent failures.

What if the drive isn’t detected at all? Try connecting it to a different SATA port or using a USB enclosure. If it’s still not detected, the controller may have failed, and data recovery will require professional services.

What if the system crashes during the test? That itself is a strong sign of failure. Reboot, back up what you can, and prepare to replace the drive.

What if the drive is under warranty? Many SSDs come with a 3–5 year warranty. If SMART shows a failure, contact the manufacturer for a replacement. Back up your data first—they will not return your data.

Frequently Asked Questions

1. How long do SSDs typically last? Most consumer SSDs are rated for 300–600 TBW, which translates to 5–10 years for typical use. But failure can happen earlier due to manufacturing defects or power surges.
2. Can I recover data from a dead SSD? Sometimes, but it’s much harder than with hard drives. If the controller is dead, you may need professional data recovery, which is expensive. If only some cells are bad, the drive may still be readable enough to copy files.
3. Does defragmenting damage an SSD? Yes, it causes unnecessary write cycles and wears the flash memory faster. Windows automatically disables it for SSDs.
4. What does “Reallocated Sector Count” mean? It counts how many bad blocks the drive has remapped to spare areas. An increasing number is a strong warning sign.
5. Is it safe to use an SSD after a SMART warning? You can use it temporarily to back up data, but do not trust it for anything important. Replace it as soon as possible.
6. Can a failing SSD cause file corruption? Yes. If the drive can’t read or write reliably, files can become corrupted, and the operating system may crash.

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