Check your SSD health before data loss happens

Your solid-state drive will fail eventually — all storage does — but you can see it coming. SSDs show warning signs weeks or months before they stop working: slower speeds, files that won't open, or the drive disappearing from your system entirely. The tools to catch these signs exist on your computer right now, and they take minutes to run.

The most direct method is to read your drive's SMART data, which is a built-in health report that every modern SSD maintains. SMART stands for Self-Monitoring, Analysis and Reporting Technology. Your drive constantly tracks how many times it has been written to, how hot it runs, and how many read errors it encounters. You do not need special hardware — just a free tool that reads what your drive already knows about itself.

Windows, Mac, and Linux all have ways to check this data. The process differs slightly by operating system, but the goal is the same: open a tool, point it at your drive, and read the numbers. If certain values are climbing toward their limits, you have time to back up your files and plan a replacement.

Key Takeaways

  • SMART data is a health report built into every SSD that tracks wear, temperature, and errors — you can read it with free tools without opening your computer.
  • Windows users can check SMART data using CrystalDiskInfo (free) or the built-in PowerShell command, while Mac users need a third-party tool like DriveDx or Disk Utility's information panel.
  • Warning signs include a SMART status of "Caution" or "Bad," rising error counts, or temperatures consistently above 50°C, all of which mean your drive may fail within weeks or months.
  • Back up your files immediately if SMART shows problems, because an SSD can go from working to completely unreadable with little warning.

How to check SMART data on Windows

The easiest Windows method is CrystalDiskInfo, a free tool that displays your drive's health in plain language. Download it from the official CrystalDiskInfo website, install it, and open the program. It will automatically detect all your drives — internal and external — and show you a colored status indicator at the top: blue means healthy, yellow means caution, and red means the drive is failing.

Scroll down to see the detailed SMART attributes. The ones that matter most are Reallocated Sector Count (how many bad spots the drive has marked as unusable), Current Pending Sector Count (bad spots it has found but not yet marked), and Uncorrectable Error Count (errors it could not fix). If any of these are above zero and climbing, your drive is degrading. Also watch Power-On Hours to see how long the drive has been running, and Temperature to check if it is overheating.

If you prefer not to install software, open PowerShell as administrator (right-click the Start button, select Windows PowerShell (Admin)), then paste this command: Get-PhysicalDisk | Select-Object FriendlyName, HealthStatus, OperationalStatus. This will show you a quick status for each drive. If HealthStatus shows anything other than "Healthy," your drive needs attention.

How to check SMART data on Mac

Mac does not include a built-in SMART reader in the standard Disk Utility, so you will need a third-party tool. DriveDx is the most straightforward option — it costs money but has a free trial period that lets you see your drive's full health report. Download it, install it, and open the program. It will show your drive's status and SMART data in an easy-to-read format, with warnings if anything is wrong.

If you want a free option, Disk Utility (in Applications > Utilities) can show some information. Open it, select your drive from the list on the left, and click the Info button. This will display basic details including whether the drive has reported any errors, but it does not show the full SMART breakdown. For a more complete picture without paying, search the Mac App Store for "smart" — several free utilities will read and display your drive's SMART data.

How to check SMART data on Linux

Linux users can use smartctl, a command-line tool that comes pre-installed on most distributions. Open a terminal and run: sudo smartctl -a /dev/sda (replace sda with your drive's identifier if it is different — use lsblk to list all drives). This will display the complete SMART report for that drive.

If you prefer a graphical interface, install GNOME Disks (on Ubuntu and similar systems, search for "Disks" in your application menu). Open it, select your drive, and click the menu button (three horizontal lines). Select "SMART Data & Self-Tests" to see your drive's health report in a readable format.

What the SMART numbers actually mean

SMART attributes are measured on a scale where higher is usually better — a value of 100 means the drive is brand new, and the number counts down as the drive ages. Each attribute has a threshold, which is the point at which the drive is considered to have failed. When a value drops below its threshold, the drive's status changes to "Caution" or "Bad."

However, some attributes matter more than others. Reallocated Sector Count and Current Pending Sector Count should stay at zero. If either one is above zero, your drive has physical damage and will likely fail soon. Uncorrectable Error Count should also be zero. Power-On HoursTemperature should stay below 50°C during normal use; if it is consistently above 60°C, your drive is overheating and will wear out faster.

The Wear Leveling Count (on SSDs) shows how evenly the drive has distributed writes across its memory cells. This number counts down from 100 as the drive ages, and it is normal for it to be lower than other attributes. When it reaches zero, the drive has reached the end of its design life, but this usually takes years of heavy use.

What to do if SMART shows problems

If your SMART status is yellow (Caution) or red (Bad), or if error counts are climbing, back up your files immediately. Do not wait. An SSD can go from showing warnings to becoming completely unreadable in days or even hours once it starts failing. Copy everything you need to an external drive or cloud storage.

After you have backed up, you have two choices: replace the drive now, or monitor it closely and replace it soon. If the status is yellow and error counts are low, you may have weeks of usable time left. If the status is red or error counts are high, the drive could fail within days. Check the SMART data again in a few days to see if the numbers are getting worse. If they are climbing quickly, replace the drive sooner rather than later.

Do not try to repair an SSD with failing SMART data — there is no repair process for solid-state drives. Once the memory cells start failing, the only solution is replacement. Some data recovery services can retrieve files from a failed SSD, but this is expensive and not always successful.

Why your SSD might be showing problems

SSDs fail for different reasons. Age and wear is the most common — every SSD has a limited number of write cycles, and once you exceed that, the memory cells start to degrade. This usually takes years, but heavy users (video editors, database administrators) can reach the limit faster. Heat is another culprit — if your drive is in a hot case or blocked from airflow, it will wear out sooner. Power loss during writes can corrupt the drive's internal structures, especially if your computer loses power unexpectedly during a large file operation.

Manufacturing defects are less common but do happen. If your drive is brand new and already showing errors, contact the manufacturer about a warranty replacement. Most SSD warranties cover three to five years, and some cover the drive for a certain number of terabytes written. Check your drive's documentation to see what your warranty covers.

How often to check your SSD health

If your drive is healthy, check it once every few months — just to establish a baseline and catch problems early. If you see any yellow warnings or error counts above zero, check it weekly to see how fast things are getting worse. This will help you decide whether you have time to order a replacement or need to do it urgently.

Set a calendar reminder if you tend to forget. Checking SMART data takes two minutes, and it is the difference between an orderly drive replacement and a sudden data loss. Most people only check when something feels slow or wrong, which is too late — by then the drive may already be losing data.

Frequently Asked Questions

Can I fix an SSD if SMART shows errors?

No. SSDs cannot be repaired the way hard drives sometimes can. Once the memory cells start failing, the only solution is to replace the drive. Back up your files and order a new SSD. Data recovery services exist but are expensive and not always successful.

What temperature is too hot for an SSD?

SSDs are designed to run safely up to 70°C, but they wear out faster at high temperatures. If your drive is consistently above 50°C during normal use, check that your case has good airflow and that the drive is not blocked. Temperatures above 60°C during idle time suggest a cooling problem.

Does checking SMART data damage my drive?

No. Reading SMART data is a passive operation — the tool only reads information the drive has already collected. It does not write to the drive or stress it in any way. You can check SMART data as often as you want without risk.

What if SMART says my drive is healthy but it is running slowly?

SMART data shows physical wear, not performance issues. A slow drive with healthy SMART data usually has a software problem — too many background processes, a full drive, or malware. Try restarting your computer, freeing up disk space, or running a malware scan. If the drive is nearly full, clearing space often restores speed.

How long does an SSD last before it fails?

Most SSDs are rated for three to five years or a certain number of terabytes written, whichever comes first. Heavy users may reach the limit sooner. SMART data will show you how close your specific drive is to failure — some drives last ten years, others fail after two, depending on how much you use them and how hot they run.