The fastest way to check SSD health is to pull SMART data straight from the drive with a free tool: CrystalDiskInfo on Windows, smartctl on Linux, or a built-in disk utility on macOS. Each one reads the same health counters the drive already tracks. No case-opening, no lab required.
Catching a failing SSD early buys you the one thing that matters: time to back up before the drive locks up mid-boot. Here is which tool to run, what the numbers mean, and which warning signs count as urgent.
Check SSD Health on Windows With CrystalDiskInfo
CrystalDiskInfo is the standard for a reason. It reads SMART attributes straight from the controller and translates them into a plain health status: Good, Caution, or Bad.
Download it, run it, and check the top of the drive panel. A blue “Good” label means normal operating range. Yellow or red means the drive is degrading and you should not wait to act.
Scroll down for raw attribute values: reallocated sector count, wear leveling count, and total bytes written (TBW). A rising reallocated sector count is the clearest sign a drive is dying.
Check SSD Health on Linux With smartctl
Install smartmontools, then run sudo smartctl -a /dev/sda (swap in your drive’s actual path). This dumps the full SMART attribute table straight from the firmware, no GUI required.
Look for the overall self-assessment line near the top, plus reallocated sectors and power-on hours. If smartctl flags “FAILED” on the health test, back up immediately and plan a replacement.
You can also run a full self-test with sudo smartctl -t long /dev/sda, then check results with -l selftest. This exercises the drive instead of just reading logged counters.
Check SSD Health on a Mac
macOS does not expose full SMART data since most Mac SSDs are proprietary NVMe modules. Disk Utility only tells you “Verified” versus “Failing,” a coarse but still useful signal.
For more detail, third-party tools like DriveDx decode Apple’s SSD-specific attributes, including a remaining life percentage that Disk Utility does not show.
SMART Attributes That Actually Matter
Three numbers matter more than the rest of the report. Reallocated sector count tracks storage cells the drive has swapped out because they went bad; any upward movement is a real signal.
Wear leveling count (also called percentage used or media wearout) estimates how much of the drive’s rated write endurance is gone. It should climb slowly, never spike.
Total bytes written is the lifetime write volume. Compare it against your model’s published TBW rating to gauge how much life is left.
Signs Your SSD Is Already Failing
Some symptoms show up before any tool flags a problem: files that vanish or corrupt without explanation, random freezes during read or write, or a drive that disappears from the BIOS and then reappears after a reboot.
If you need to find where your drive shows up in firmware, our guide on how to open BIOS on Windows 11 covers exactly where storage devices are listed.
Heat shortens SSD lifespan too, especially in laptops with cramped airflow. If your machine runs hot in general, work through how to fix laptop overheating alongside a SMART check. And if a machine shuts down at random rather than freezing, the culprit might be the power supply rather than the drive; see how to test a power supply without a multimeter before you replace anything.
Frequently Asked Questions
How often should I check my SSD’s health?
Once a month for a personal machine. Check weekly if the drive is older than three years or holds data you cannot afford to lose.
Can a healthy SMART report still mean a drive is about to fail?
Yes. SMART catches gradual wear well but cannot predict a sudden controller failure or firmware bug. Treat it as one signal, not a guarantee.
Does checking SSD health shorten the drive’s lifespan?
No. Reading SMART attributes is a passive query. A full self-test in smartctl adds a small amount of read activity, negligible next to normal daily use.