The 7 signs of a failing hard drive (and what to do)

The hard drive is the most fragile component in a computer, and one of the most critical. It's where all your data lives: photos, documents, videos, emails, apps. When it fails, it can take years of memories and work with it.

The good news: a hard drive almost never fails without warning. It sends out alarm signals for weeks, sometimes months, before total failure. You just have to know how to recognise them.

The 7 warning signs not to ignore#

1. Abnormal noises (clicking, grinding, scraping)#

A mechanical hard drive (HDD) naturally makes a slight rotation noise. On the other hand, if you hear repeated clicking, grinding or a scraping sound, that's a sign the read head is catching or the platters are damaged.

This phenomenon, called the "click of death" in the trade, often indicates imminent mechanical failure. An SSD, on the other hand, is silent: any unusual noise from an SSD is suspicious and warrants investigation.

What to do: back up everything immediately and consult a technician.

2. Unusual, sudden slowness#

A PC that was smooth and suddenly becomes very slow, without you installing any new software or running an update, can be a sign of a struggling drive.

When a sector on a hard drive starts having trouble reading, the system multiplies its read attempts, which results in momentary freezes (sometimes lasting several seconds) when opening files or apps. That's not normal, even on an old PC.

3. SMART errors detected#

Modern hard drives embed a self-diagnostic system called SMART (Self-Monitoring, Analysis and Reporting Technology). This system continuously monitors dozens of parameters: bad sectors, read errors, temperature, power-on cycle count…

Windows may sometimes display a SMART warning at startup, but not always. Free software like CrystalDiskInfo reads this data in real time and gives you a clear status: Good, Caution or Bad.

A "Caution" or "Bad" status means the drive should be replaced without delay.

4. Corrupted files or files that won't open#

You open a Word document or a photo and get an error message, when the file opened perfectly yesterday? Or a downloaded file is systematically corrupted?

This symptom indicates the drive is having trouble reading or writing data reliably. Bad sectors are piling up, and the files stored there become unreadable. The longer it goes on, the faster the spread.

5. Recurring freezes and lock-ups#

Your PC freezes for several seconds, even minutes, then carries on as if nothing happened? Or it becomes completely unresponsive to keyboard and mouse, forcing a hard restart?

These lock-ups are often caused by a drive that takes an abnormally long time to answer the operating system's requests. The system waits… and waits. It's different from a lack of RAM or overheating: drive-related freezes tend to occur during file access (opening software, saving a document).

6. Blue screens (BSOD) with storage-related error codes#

Blue Screens of Death (BSOD) have many causes, but some codes point directly to a storage problem:

• CRITICAL_PROCESS_DIED
• NTFS_FILE_SYSTEM
• INACCESSIBLE_BOOT_DEVICE
• BAD_SYSTEM_CONFIG_INFO
• DISK_BOOT_FAILURE

If these blue screens occur repeatedly, particularly at startup or during file operations, the drive is the first suspect to check.

7. Disk space disappearing mysteriously#

You haven't installed anything, haven't downloaded anything, and yet your free space is dropping inexplicably? Or Windows reports the drive as full when you've just checked the folders?

This can indicate that Windows is generating error files in bulk (memory dumps, event logs), a sign something is wrong with the storage. It's an indirect signal not to ignore.

How to check your drive's condition#

CrystalDiskInfo (Windows, free)#

This is the reference tool for reading a drive's SMART data. It shows at a glance the status of each drive (Good, Caution, Bad) and detailed parameters such as the number of reallocated sectors, uncorrected read errors or total operating time.

Downloadable from crystalmark.info.

HD Tune (Windows, free version available)#

HD Tune runs a full surface scan of the drive and visually spots bad sectors (displayed in red). A healthy drive should have an entirely green scan. It also measures read performance in real time, a sudden drop in throughput is a bad sign.

The SMART command line#

For users comfortable with the terminal, the following command in PowerShell (as administrator) gives a quick summary:

wmic diskdrive get status

A result of OK for each drive is reassuring. A result of Pred Fail (Predicted Failure) means SMART has detected imminent failure.

1. 1
   Download and launch CrystalDiskInfo, note the displayed status for each drive (blue icon = Good, yellow = Caution, red = Bad).
2. 2
   If the status is Caution or Bad, immediately plug in an external drive or USB stick and copy your important documents, photos and critical files.
3. 3
   Run HD Tune to perform a surface scan, wait for the test to finish (20–60 min depending on drive size) and note the number of bad sectors.
4. 4
   If bad sectors are detected or the SMART status is degraded, book an appointment with a technician to replace the drive before total failure.

What to do if your drive is failing#

Step 1: emergency backup#

Before any action, back up what you can. If the PC still boots, copy as a priority:

• Your documents (Desktop, My Documents)
• Your photos
• Your emails (if you use a client like Outlook or Thunderbird)
• Your passwords and browser bookmarks

A failing drive can become completely unreadable from one day to the next. Every hour counts.

Step 2: replacement with an SSD#

The recommended fix is to replace the failing drive with an SSD (not another mechanical HDD). An SSD is faster, quieter, more shock-resistant, uses less power, and crucially, has no mechanical parts liable to wear out.

At L'Atelier de Sam, the replacement includes:

• Cloning your old drive to the new one (when it's still possible)
• Or a clean reinstall of Windows with data recovery
• Migration of your settings and software

Step 3: data recovery if the drive is already dead#

If the drive no longer responds at all, recovery software like Recuva (free) or Disk Drill can sometimes recover files from a partially readable drive. In case of severe mechanical failure (damaged platters, broken read head), a specialist cleanroom is needed, an expensive service (€300 to €1,500) that remains the last resort.

How much does replacing a failing drive cost?#

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In summary#

A hard drive can be replaced quickly and cheaply if you act before total failure. The classic mistake is to wait until the PC won't boot, by then, data is often unrecoverable without expensive specialist work.