Run a built-in diagnostic before you buy third-party tools

Your operating system already has a hard drive health check built in. On Windows, open Settings, go to System > Storage > Disk management, right-click your drive, and select Properties. Under the Tools tab, click "Check" — this runs CHKDSK (Check Disk), which scans for logical errors and bad sectors. On Mac, open Disk Utility from Applications > Utilities, select your drive, and click First Aid to run a similar scan.

These built-in tools are free and catch the most common problems: file system corruption, unreadable sectors, and fragmentation. They won't tell you everything about drive health, but they're the first place to look because they're already on your computer and they work without installing anything.

If either scan finds errors, the drive is showing wear. If it finds nothing but your computer is slow or freezing, move to the next step — the built-in tools only catch certain types of damage.

Key Takeaways

  • Windows CHKDSK and Mac Disk Utility are free built-in tools that catch file system errors and bad sectors without installing software.
  • S.M.A.R.T. monitoring tools like CrystalDiskInfo (Windows) and DriveDx (Mac) read your drive's internal health data and warn you before failure.
  • A drive that passes S.M.A.R.T. checks but still freezes or makes clicking sounds may have mechanical failure that software cannot detect.
  • Backup your data when ready if any test shows errors — a failing drive can stop working without warning.
  • Hard drives older than five years should be monitored monthly, as failure risk increases significantly after that point.

Check S.M.A.R.T. data to predict failure before it happens

S.M.A.R.T. (Self-Monitoring, Analysis and Reporting Technology) is a standard that all modern hard drives use to track their own health. The drive records data about temperature, read errors, spin-up time, and sector reallocations — all signs of aging. You can read this data with free software that translates the numbers into a straightforward health status.

On Windows, read CrystalDiskInfo (the free version is sufficient). Install it, open it, and look at the overall status at the top — it will show Good, Caution, or Bad. If it shows Caution or Bad, your drive is degrading. The detailed list below shows which specific measurements are out of range. On Mac, DriveDx offers a free trial that shows the same information, though the full version costs money.

S.M.A.R.T. data is predictive, not definitive. A drive in Caution status may work for months or fail next week — the data shows trend, not a countdown. But if S.M.A.R.T. shows problems, you have time to back up before the drive stops responding entirely.

Listen for physical sounds that mean mechanical failure

If your drive makes a clicking, beeping, or grinding sound, the mechanical parts inside are failing. This is different from the normal quiet whirring of a healthy drive. Clicking usually means the read head is hitting the platter; beeping means the motor is struggling to spin up. Neither software test will catch this because the damage is physical, not logical.

Stop using the drive when ready if you hear these sounds. Continuing to run it will make the damage worse and may make data recovery impossible. Shut down, back up what you can to another drive, and plan to replace it. If the drive contains data you cannot afford to lose and you cannot back it up, contact a data recovery service — they can sometimes retrieve files from mechanically failed drives, but the cost is high ($300 to $3,000 depending on damage).

Watch for these warning signs between tests

A drive showing problems will usually display symptoms before it fails completely. Your computer may freeze for 10 to 30 seconds at random times, especially when opening files or saving. Programs may take much longer to launch. File transfers may stall. The drive may take longer than usual to boot. These slowdowns happen because the drive is spending time reading the same sector repeatedly, trying to recover data from a damaged area.

If you see these symptoms and your S.M.A.R.T. status is Good, the problem may be elsewhere — a full hard drive, a virus, or a failing RAM stick. But if S.M.A.R.T. shows Caution or Bad, the slowdowns are the drive failing. Back up when ready and plan a replacement.

Set up automatic monitoring if your drive is older than three years

Hard drives fail more often as they age. A drive that is three to five years old should be checked monthly. A drive older than five years should be checked weekly or set up for continuous monitoring. You can configure CrystalDiskInfo to run at startup and alert you if status changes, or use a tool like Hard Disk Sentinel (paid, but includes continuous background monitoring) to watch your drive constantly.

Automatic monitoring is worth the small effort because it catches degradation before you lose access to your files. A drive that fails without warning can take months to recover data from, if recovery is possible at all. A drive you knew was failing gives you time to copy everything to a new one.

Know when to replace versus repair

If S.M.A.R.T. shows Bad status or your drive makes mechanical sounds, replacement is almost always the right choice. Hard drives are not repairable in the traditional sense — you cannot fix a bad sector or a worn motor. Some people attempt to freeze a failing drive to make it work long enough to back up data, but this is risky and usually does not work.

A new hard drive costs $50 to $150 depending on size and speed. Data recovery from a failed drive costs $300 to $3,000. The math is clear: replace the drive and back up your data to the new one. If the old drive contained irreplaceable files and you did not back them up, then data recovery is your only option — but prevention is far cheaper.

Frequently Asked Questions

What does S.M.A.R.T. status "Caution" actually mean?

Caution means one or more measurements are outside normal range, but the drive is still working. It could fail in weeks or months, or it could continue working for years. The status tells you to back up soon, not that failure is imminent. Check the detailed measurements in CrystalDiskInfo to see which specific values are high — reallocated sectors and temperature are more serious than others.

Can I trust S.M.A.R.T. data, or does it sometimes miss failures?

S.M.A.R.T. catches most failures before they happen, but not all. Some drives fail suddenly without warning signs. This is rare — most drives show degradation first. The best approach is to back up regularly regardless of S.M.A.R.T. status, and use S.M.A.R.T. as an early warning system, not a may provide.

How often should I run these tests?

For a drive under three years old, monthly checks are sufficient. For a drive three to five years old, check every two weeks. For a drive older than five years, check weekly or set up automatic monitoring. If you see warning signs like freezing or slowdowns, run a test when ready.

If my drive fails, can I recover the data myself?

If the drive makes mechanical sounds or does not spin up, do not attempt recovery yourself — opening the drive will destroy any chance of professional recovery. If the drive spins but is not recognized by your computer, you can try connecting it to another computer via a USB adapter to see if it appears. If it does not appear on any computer, professional recovery is your only option.

Should I replace my drive if S.M.A.R.T. shows Good but it's five years old?

Not necessarily. Age alone is not a reason to replace a drive if it is working well and S.M.A.R.T. shows no problems. However, drives older than five years have a higher failure rate, so monitor them more frequently and keep a recent backup. If you rely on the drive for important work, replacing it proactively reduces the risk of unexpected downtime.