PC Hardware / SSD & HDD
How to Check if Your SSD or HDD Is Failing
Quick answer
Copy important files off first if the drive is acting strangely. Then look at free space, Windows' own error checking, and the drive's health status if Windows shows one. A clean check is not a lifetime guarantee. Clicking, vanishing drives, and "backup now" messages are strong indications to stop experimenting and save data.
Quick diagnosis
If several of these match what you see, you are in the right guide.
- The PC freezes for seconds, especially when opening files
- A drive disappears and comes back, or asks to be formatted
- Unusual clicking from a spinning hard disk
- Windows reports the disk is failing or has errors
- Copying files is suddenly far slower than it used to be
Possible causes
- A mechanical hard disk that is wearing out
- An SSD that is running out of spare space internally or reporting health warnings
- A nearly full drive that feels "sick" but is not dying
- A loose cable (more common on desktops and external USB enclosures)
- File-system errors that software can sometimes repair, and sometimes cannot
What you need
- File Explorer
- Settings → System → Storage
- An external drive or cloud account you already use, if you need to copy files
What this problem usually means
An SSD (solid-state drive) has no spinning platters. An HDD (hard disk drive) does. Both can fail. Failure is not always a dramatic crash: it can be random stalls, files that will not copy, or a disk that works after a restart and then vanishes again.
Windows can hint. It cannot promise a drive is healthy. SMART is the drive's own diary of warning signs, useful, not a crystal ball. A drive can fail with a "Healthy" label; a "Warning" label is a reason to back up immediately, not to run a random "disk booster."
A drive that is almost full can make Windows feel frozen because it has no room to work. That is urgent cleanup, not the same as a dying disk. If an external USB disk is the one missing, also see external hard drive not showing up.
Before you start
Error checking and format prompts write to the disk. On a dying drive that can make recovery harder. Use another disk or a cloud account you already trust. Do not upload private files to an unknown "repair" website.
- Do not ignore repeated clicking from a spinning disk. Power down after the backup attempt and seek help rather than running overnight repairs.
- Skip disk "optimizer" and "SMART fixer" downloads from ads. Use Windows, then the drive maker's official tool if you still need a second opinion.
Quick fixes
1. Check that the drive is not simply full
- Open File Explorer → This PC.
- Look at the bar for Windows (C:) and any other disks.
- If a bar is red or only a few gigabytes remain, free space first: empty Recycle Bin, move videos, uninstall what you do not use.
A full disk can mimic a failing one (stutters, failed updates). It is still a real problem, but the fix is space, not a new SSD, unless the disk is also throwing health warnings.
2. Copy important folders if anything already feels "off"
Documents, photos, and browser bookmarks you care about should leave the suspect disk before you run repairs. If copies fail with I/O or cyclic redundancy errors, stop and treat that as a strong indication of hardware trouble.
Step-by-step troubleshooting
See how Windows describes the disk
- Open Settings → System → Storage.
- Open Advanced storage settings → Disks & volumes (wording can vary slightly by Windows 11 version).
- Select the disk and read size, type if shown, and any status Windows lists.
This screen is orientation, not a lab report. For a second built-in view, right-click Start → Windows Terminal or PowerShell and run the command below.
Get-PhysicalDisk- What this does
- Lists physical disks and a HealthStatus such as Healthy, Warning, or Unhealthy.
- Why run it
- It is a quick official hint from Windows' storage layer, without a third-party scanner.
- What you should see
- A small table. FriendlyName, MediaType (SSD or HDD), Size, and HealthStatus. "Healthy" means Windows has not been told of a problem, not that the drive cannot fail tomorrow.
- If it fails
- Type it in Windows PowerShell or Terminal, not in an old Command Prompt that does not understand the command. If no disks list, you may not have permission on a locked-down work PC, ask IT rather than downloading a disk tool.
Error checking in File Explorer (read the warning)
- In File Explorer, right-click the drive → Properties → Tools.
- Under Error checking, choose Check.
- If Windows offers to scan, start with a scan. Repair options write to the disk, skip them if you have not backed up and the drive is already clicking or vanishing.
A scan that finds no file-system errors does not prove the hardware is fine. It only means Windows did not see certain kinds of directory damage in that pass.
SMART, in plain language
SMART is a set of counters inside the drive: temperature, reallocated sectors, and similar notes. Windows may surface this only as Healthy/Warning. Drive makers sometimes offer an official utility that reads more detail, download that only from the maker's site (Samsung, WD, Seagate, Crucial, and so on), never from a "driver pack" ad.
Treat Warning or Unhealthy as a backup-now event. Treat Healthy as "no alarm right now," not a warranty.
External and USB enclosures
A disk can be fine while the USB bridge is not. If an internal clone in another enclosure works, the old box was the failure. If USB is not recognized when you plug the enclosure in, fix the USB path before you conclude the platters or NAND are dead.
Can Windows still see the files?
Choose an answer. The next question appears below, no account or download required.
Copy important files off now, then check free space and HealthStatus. Run error checking only after the copy, or skip repair if the drive clicks. Replacement is appropriate if warnings continue after space is freed.
Do not format. Try another cable or PC for externals. For internals, limit power cycles. Data recovery may need a specialist. Software "repair" is a later conversation after you decide the files are expendable.
How to know the problem is fixed
- Important files exist on a second disk or in your usual cloud, if the original drive was suspect.
- You know whether Windows labeled the disk Healthy, Warning, or Unhealthy, and you have not treated Healthy as a guarantee.
- Free space is no longer critically low, or you have a plan to replace a disk that stays unhappy after cleanup.
If the problem continues
If HealthStatus is Warning/Unhealthy, or copies keep failing, plan replacement. Clone only with tools you already trust, and never from a bundled adware ISO. A PC shop can image a dying disk more safely than repeated CHKDSK loops. If the PC is also running slowly with a full C: drive, free space and a health check belong together.
When this may be hardware failure
Clicking HDDs, SSDs that drop to 0 bytes, SMART warnings, and I/O errors on several cables are strong indications of hardware. Confirmed failure is usually "it does this on another controller/PC" or a professional's test. Until then, talk in likelihoods and get the data off.
Common mistakes to avoid
- Formatting to "see if it comes back."
- Running aggressive repair on a clicking drive as step one.
- Trusting a single Healthy label as proof the disk will last years.
- Ignoring a full C: drive and replacing the SSD anyway without checking space.
- Downloading a SMART tool from a banner ad.
Frequently asked questions
My SSD has no moving parts. Can it still fail?
Yes. SSDs fail more quietly than clicking disks: sudden disconnects, failed writes, or a computer that will not boot. Lack of noise is not a health certificate.
Is a slow PC always a dying disk?
No. Full disks, low RAM, and heat also slow a machine. Use this guide when the disk-specific signs are present, not as the only explanation for slowness.
Should I defragment an SSD?
Windows Optimize Drives already treats SSDs differently (trim). Do not run old weekly HDD defrag advice on an SSD as a "fix" for failure. It will not reverse hardware wear.
Written by Practical PC editorial team. We write practical Windows and PC troubleshooting guides for home users, students, and office workers. Guides are researched from official documentation and widely observed support patterns, then reviewed for safety and plain language. We do not invent lab tests, certifications, or first-hand repair experience we do not have.