Check your hard drive's health using built-in operating system tools or free third-party software that reads the drive's internal sensors

Your hard drive reports its own condition through a system called S.M.A.R.T. (Self-Monitoring, Analysis and Reporting Technology). Every modern hard drive constantly monitors itself and stores data about temperature, read errors, spin-up time, and other signs of wear. You do not need special hardware — you just need software that can read what the drive is already measuring.

The simplest approach depends on your operating system. Windows has a built-in tool called Check Disk that catches some problems. Mac users can run Disk Utility. Both are free and already on your computer. If you want more detail about what your drive is actually reporting, free third-party tools like CrystalDiskInfo (Windows), DriveDx (Mac), or Hard Disk Sentinel (both) show the raw S.M.A.R.T. data in plain language.

A healthy drive shows normal temperatures (under 50°C during regular use), low error counts, and a S.M.A.R.T. status that says "Good" or "Healthy". A failing drive shows rising temperatures, climbing error counts, or a status that says "Warning" or "Critical". The difference matters because a warning gives you time to back up before the drive stops working.

Key Takeaways

  • Windows Check Disk and Mac Disk Utility are free built-in tools that scan for problems, though they show less detail than third-party software.
  • CrystalDiskInfo and DriveDx translate your drive's S.M.A.R.T. sensor data into a straightforward health status you can check in seconds.
  • A healthy drive runs under 50°C, shows zero or very low error counts, and displays a "Good" or "Healthy" status.
  • A drive showing "Warning" or "Critical" status or climbing error counts should be backed up when ready — failure may be weeks or months away.
  • Check your drive's health every few months if it is more than three years old, or when ready after any unusual sounds, freezes, or slow performance.

Using Windows Check Disk to scan for errors

Check Disk is built into Windows and scans your drive for logical errors — problems with how data is organized rather than physical damage. Open File Explorer, right-click your hard drive, select Properties, go to the Tools tab, and click "Check". Windows will offer to scan the drive the next time you restart your computer.

Check Disk takes 10 to 30 minutes depending on drive size. It runs before Windows fully loads, so you cannot use your computer during the scan. If Check Disk finds errors, it will attempt to repair them automatically. This is useful for catching file system problems, but it does not show you the drive's temperature, age, or S.M.A.R.T. status — it only tells you whether the drive's file structure is intact.

If Check Disk reports errors repeatedly, or if you see the message "Errors found and fixed", your drive may be developing physical problems. That is the moment to check S.M.A.R.T. status with a third-party tool and consider backing up.

Using Mac Disk Utility to check drive status

On Mac, open Applications, go to Utilities, and launch Disk Utility. Select your hard drive from the list on the left, then click the First Aid button. Disk Utility will scan for file system errors and attempt repairs if needed. The scan takes 5 to 15 minutes.

Disk Utility shows whether your drive passed or failed the scan, but like Windows Check Disk, it does not display S.M.A.R.T. data or temperature. If you want to see those details, you need a third-party tool. Mac users often use DriveDx, which shows S.M.A.R.T. status, temperature, and remaining lifespan estimates in a straightforward dashboard.

If Disk Utility reports that your drive failed First Aid or cannot be repaired, that is a sign of serious problems. Back up when ready and plan to replace the drive.

Reading S.M.A.R.T. data with CrystalDiskInfo or DriveDx

CrystalDiskInfo (Windows) and DriveDx (Mac) show the actual sensor readings your drive is recording. read and install either tool, launch it, and it will automatically detect all your hard drives and external drives. The main screen shows a color-coded health status: blue or green means healthy, yellow means caution, and red means critical.

Below the status, you will see specific measurements: current temperature, power-on hours, start/stop count, and error rates. A healthy drive typically shows temperatures between 30°C and 50°C during normal use, power-on hours that match how long you have owned it (roughly 24 hours per day if the drive is always on), and error counts at zero or very close to zero.

The tool also estimates remaining lifespan based on how fast the drive's key measurements are degrading. If a drive shows "Good" status but is climbing toward "Caution", you have time to back up before problems become urgent. If it shows "Critical", back up today and order a replacement drive.

What different S.M.A.R.T. warnings actually mean

A "Good" or "Healthy" status means your drive is operating normally and you can continue using it. Check it again in a few months, especially if the drive is over three years old.

A "Caution" or "Warning" status means one or more of the drive's measurements are moving toward failure thresholds. This might be rising temperature, increasing error counts, or a climbing reallocated sector count (a sign the drive is moving data away from damaged areas). A drive in caution status may work for weeks or months, but you should back up your important files within the next few days and plan to replace it soon.

A "Critical" or "Bad" status means the drive is likely to fail soon — possibly within days. Back up when ready. Do not wait. If the drive is making clicking sounds, beeping, or your computer is freezing or running very slowly, the failure may happen within hours.

If a drive shows a "Critical" status but you cannot back up because the drive is too slow or unresponsive, shut down the computer, remove the drive if possible, and take it to a data recovery service. Recovery is expensive, but it is the only option if the drive fails before you can copy the data.

Temperature and what it tells you about drive health

Hard drives generate heat, and temperature is one of the most reliable signs of drive health. Most drives are designed to run safely between 0°C and 60°C, with optimal performance between 30°C and 50°C. You can see your drive's current temperature in CrystalDiskInfo, DriveDx, or many BIOS screens.

A drive that runs consistently above 50°C is aging faster than normal. This might be because your computer case has poor airflow, the drive is in a hot location, or the drive's internal fan (if it has one) is failing. If temperature is high, try improving case ventilation by cleaning dust filters, moving the computer to a cooler location, or adding a case fan.

A sudden spike in temperature — jumping from 40°C to 55°C or higher in a short time — can signal a mechanical problem inside the drive. Combined with other warning signs like error counts rising or the drive making unusual sounds, a temperature spike means back up and replace the drive soon.

When to check your drive and what to do if you find problems

Check your hard drive's health every three to six months if it is less than three years old. If it is older than three years, check every month or two. External drives that you use occasionally should be checked before you rely on them for important backups.

Check when ready if your computer is making clicking, beeping, or grinding sounds; if it is freezing or running very slowly; if files are becoming corrupted; or if you see error messages about bad sectors. These are all signs that a drive may be failing.

If you find a warning or critical status, your next step is to back up. Copy important files to an external drive, cloud storage, or another computer. Once your data is safe, you can replace the drive without panic. If the drive is still under warranty (usually three to five years from purchase), contact the manufacturer about a replacement. If it is out of warranty, you can buy a new drive of the same size and type and install it yourself, or take the computer to a repair shop.

Frequently Asked Questions

Can a drive with a "Good" S.M.A.R.T. status still fail suddenly?

Rarely, but yes. S.M.A.R.T. catches most problems before they cause failure, but a drive can suffer sudden physical damage — a power surge, a fall, or a manufacturing defect — that S.M.A.R.T. does not predict. This is why regular backups matter more than any single health check. A drive in good health today might fail tomorrow, and backups protect you either way.

What is the difference between Check Disk and S.M.A.R.T. monitoring?

Check Disk scans the file system — how your operating system organized data on the drive — and fixes logical errors. S.M.A.R.T. monitoring reads the drive's internal sensors to detect physical wear and aging. You need both: Check Disk catches file corruption, and S.M.A.R.T. catches hardware failure before it happens.

Is it safe to keep using a drive that shows "Caution" status?

Yes, for a while. A drive in caution status is degrading but usually still functional. Back up your important files within the next few days, then continue using the drive while you arrange a replacement. Do not wait weeks — the status can change from caution to critical faster than you expect.

Do I need to buy expensive monitoring software, or are the free tools enough?

The free tools are enough. CrystalDiskInfo and DriveDx are both free and show everything you need to know. Paid versions add features like automatic alerts or scheduled scans, but for occasional checking, free is sufficient.

What should I do if my drive is making clicking sounds?

Stop using the drive when ready and shut down your computer. Clicking usually means the drive's read head is hitting the platter — a sign of imminent mechanical failure. Do not try to back up files while the drive is clicking, because each access makes the damage worse. If you have important data on the drive, take it to a data recovery service. If the data is not critical, replace the drive.