What you need to know about checking SSD health

An SSD can fail without warning, but most drives give you signals before they stop working entirely. You can check your drive's health using built-in operating system tools or free third-party software that reads the drive's internal health data. The most useful metric is SMART data — information the drive itself tracks about temperature, error rates, and wear — which tells you whether the drive is degrading and how much life it likely has left.

Windows, macOS, and Linux all have ways to see this data, though none make it immediately obvious. The easiest approach for most people is to download a free tool like CrystalDiskInfo or Hard Disk Sentinel, which translates the raw numbers into a simple health status. Checking your drive takes five minutes and should happen at least once a year, or immediately if your computer is running slowly or making unusual sounds.

Key Takeaways

  • SMART data is built into every SSD and shows temperature, error rates, and wear levels that predict failure before it happens.
  • Windows has no native GUI tool for SMART data, but macOS and Linux users can see it through the system information panels.
  • Free third-party tools like CrystalDiskInfo and Hard Disk Sentinel read SMART data and display it in plain language instead of raw numbers.
  • A healthy SSD shows a green or "good" status, normal operating temperature under 50°C, and low error counts.
  • If SMART data shows declining health, back up your files immediately — the drive may fail within weeks or months.

Using Windows built-in tools

Windows does not include a graphical tool to read SMART data, but you can access it through the command line using a tool called wmic (Windows Management Instrumentation Command-line). Open Command Prompt as administrator, type wmic logicaldisk get name to see your drives, then run wmic logicaldisk where name="C:" get status (replacing C: with your drive letter). This will show "OK" or "Pred Fail" — the latter means the drive is predicting failure.

This method is limited because it only shows pass or fail, not the detailed metrics that tell you how much life remains. For more information, you need either PowerShell commands (which are more complex) or a third-party tool. Most Windows users find it faster to download free software instead of wrestling with command-line syntax.

Using macOS system information

On a Mac, click the Apple menu, select About This Mac, then click System Report. Navigate to Storage in the left sidebar and click your SSD. Look for the "S.M.A.R.T. Status" field at the bottom of the window — it will show "Verified" for a healthy drive or "Failing" if there is a problem.

This tells you whether the drive is healthy or failing, but not the details behind that status. You cannot see temperature, wear level, or error counts from System Report alone. If you want those numbers, you will need to use a third-party tool. The built-in check is useful as a quick health snapshot, but not for tracking trends over time.

Using Linux system tools

Linux users can install smartmontools, a command-line package that reads SMART data directly. Install it with sudo apt-get install smartmontools on Ubuntu or Debian, or the equivalent command for your distribution. Then run sudo smartctl -a /dev/sda (replacing sda with your drive identifier) to see full SMART data.

The output includes temperature, power-on hours, error counts, and a health assessment. Look for the line that says "SMART overall-health self-assessment test result" — it should say "PASSED". If it says "FAILED", your drive is in trouble. Linux users who prefer a graphical interface can use Gnome Disks (built into many distributions) or install a tool like GSmartControl for a point-and-click view of the same data.

Understanding SMART data and what the numbers mean

SMART stands for Self-Monitoring, Analysis and Reporting Technology. Every SSD continuously tracks metrics like temperature, power cycles, error rates, and wear level, then stores that data in a format your operating system can read. The most important metrics for an SSD are operating temperature (should stay under 50°C during normal use), wear level (measured as a percentage of remaining life), and reallocated sector count (the number of bad storage areas the drive has marked as unusable).

A healthy drive shows a green or "good" status, temperature in the 30–45°C range, wear level above 80 percent remaining, and zero or very low error counts. If temperature regularly exceeds 60°C, wear level drops below 10 percent, or error counts climb into the thousands, the drive is degrading. You do not need to understand every metric — most tools highlight the ones that matter and flag problems in red or yellow.

One important caveat: SMART data is a prediction, not a may provide. A drive can fail suddenly without warning, and a drive showing poor SMART health can keep working for months. The data is most useful as a reason to back up your files sooner rather than later, not as a precise countdown to failure.

Free tools that make SMART data readable

CrystalDiskInfo is available for Windows and macOS. It displays your drive's health as a simple colored status (green, yellow, or red), shows temperature and wear level at a glance, and logs data over time so you can see trends. The free version includes everything most people need; a paid version adds email alerts and scheduling.

Hard Disk Sentinel works on Windows and can monitor multiple drives simultaneously. It shows health status, temperature, and remaining lifespan in years (based on current wear rate). It also includes alerts if temperature spikes or health declines suddenly. The free version is limited to one drive; the paid version monitors unlimited drives.

DiskSmartTools is lightweight and works on Windows. It shows SMART status, temperature, and power-on hours in a minimal interface. Gnome Disks comes built into many Linux distributions and includes a SMART viewer without needing to install anything extra. All of these tools are free to download and run — you do not need to pay to check your drive's health.

What to do if SMART data shows problems

If your drive shows a "failing" or "poor" health status, back up your files immediately. Do not wait for the drive to fail completely. Copy everything to an external drive, cloud storage, or another computer. This should be your first step before doing anything else, because a failing drive can stop working at any moment.

After backing up, you have two choices: replace the drive now while it is still working, or continue using it while monitoring health closely. If the drive is under warranty and shows failing SMART status, contact the manufacturer — most will replace it. If the drive is out of warranty and still functional, you can keep using it as long as you have a backup, but understand the risk. Do not rely on a drive with poor SMART health for important files or as your only copy of anything you cannot afford to lose.

If SMART data shows declining health but not yet failing (yellow status instead of red), check your drive's temperature. High heat accelerates wear. Make sure your computer has good airflow, clean dust from vents, and consider adding a fan or external cooling pad if the drive regularly exceeds 50°C. Reducing temperature can slow degradation and extend the drive's remaining life.

How often to check your SSD health

Check your SSD's health at least once a year as part of regular maintenance. If your computer is more than three years old, check twice a year. If you notice your computer slowing down, freezing, or making clicking sounds, check immediately — these are signs the drive may be failing.

You can also set up automatic monitoring with tools like Hard Disk Sentinel or CrystalDiskInfo, which will alert you if health declines or temperature spikes. This is useful if you want to know about problems without remembering to check manually. Most people find that a quick manual check once or twice a year is sufficient unless the drive is old or showing signs of trouble.

Frequently Asked Questions

Can I fix a failing SSD or recover data from one?

You cannot repair an SSD yourself — the damage is at the hardware level. If the drive still powers on and is recognized by your computer, you can copy files off it before it fails completely. If the drive does not appear in your system, professional data recovery is possible but expensive (typically $300–$1,500). The best approach is to back up before failure happens.

What temperature is too hot for an SSD?

SSDs are designed to operate safely up to 70°C, but performance and lifespan degrade above 50°C. Normal operating temperature during everyday use should be 30–45°C. If your drive regularly exceeds 60°C, improve airflow around your computer or consider adding external cooling. Sustained high temperatures will shorten the drive's remaining life.

Does checking SMART data damage the drive?

No. Reading SMART data does not write anything to the drive or cause any wear. You can check as often as you want without any risk. The SMART data itself is stored in a separate area of the drive that is not affected by normal read operations.

What does "wear level" mean on an SSD?

SSDs have a limited number of write cycles before they degrade. Wear level shows what percentage of that total lifespan remains. A wear level of 80 percent means the drive has used 20 percent of its expected lifespan. Most SSDs reach end-of-life around 5–10 percent remaining, though they often fail before that point. Wear level is one of many factors in overall health.

Is it safe to use an SSD with yellow or caution status?

Yellow status means the drive is showing early signs of degradation but is not yet failing. It is safe to use as long as you have a backup of important files. Monitor it more frequently — check health every month instead of yearly — and be prepared to replace it soon. Do not use a yellow-status drive as your only copy of irreplaceable files.