Storage drives don't usually fail without warning — most give off signs for days, weeks, or even months before they finally give up. Catching those signs early can mean the difference between a quick backup and a costly, sometimes impossible, data recovery job. This guide covers how to recognise the symptoms of a failing hard drive or SSD, how to check drive health properly, and what steps to take next.

Symptoms of a Failing Hard Drive (HDD)

  • Clicking, grinding, or repetitive knocking noises from inside the case
  • Slow file transfers or long delays opening folders and applications
  • Frequent freezing, especially when accessing files
  • Files or folders that become corrupted or disappear unexpectedly
  • The drive taking longer than usual to spin up, or a delay before Windows detects it
  • Blue screens referencing storage-related errors (e.g. related to NTFS or disk drivers)
  • Windows reporting bad sectors or prompting a disk check (chkdsk) more frequently than normal

Safety warning: If you hear clicking or grinding from a hard drive, power it down immediately and stop using it. Continuing to run a mechanically failing HDD significantly increases the risk of permanent data loss. Back up or attempt recovery before further use, or consult a data recovery specialist if the data is critical.

Symptoms of a Failing SSD

SSDs fail differently from HDDs — there are no moving parts, so there's no clicking or grinding, but warning signs still exist:

  • The drive becoming read-only unexpectedly, blocking new writes but still allowing reads
  • Frequent freezes or the system becoming unresponsive under disk activity
  • Files failing to save or becoming corrupted without an obvious cause
  • The drive disappearing from BIOS/UEFI or File Explorer intermittently, then reappearing after a restart
  • A noticeable, unexplained drop in read/write speeds compared to when the drive was new
  • Repeated crashes during Windows updates or large file operations

Step 1: Check Drive Health With Built-In Tools

Using Windows

  1. Open File Explorer, right-click your drive, and select Properties > Tools > Check (or Error checking) to scan for file system errors.
  2. Open Command Prompt as administrator and run wmic diskdrive get status — a result other than "OK" indicates a detected problem.
  3. Run chkdsk C: /f /r (replacing C: with the relevant drive letter) to scan for and attempt to repair bad sectors — note this requires a restart if run on your system drive.

Checking S.M.A.R.T. Data

S.M.A.R.T. (Self-Monitoring, Analysis and Reporting Technology) is built into almost all modern drives and tracks dozens of health indicators.

  1. Download a free tool such as CrystalDiskInfo, GSmartControl, or HD Sentinel.
  2. Open the tool and look at the overall health status, typically shown as Good, Caution, or Bad.
  3. Pay particular attention to these key S.M.A.R.T. attributes: - Reallocated Sectors Count: Rising numbers indicate the drive is retiring damaged sectors — a strong warning sign - Pending Sector Count: Sectors flagged as unstable, awaiting reallocation - Uncorrectable Sector Count: Sectors that could not be read or repaired at all - Power-On Hours: Useful context — very high hours on an older HDD raises the likelihood of mechanical wear - SSD-specific: Wear Levelling Count / Media Wearout Indicator: Shows how much of the SSD's rated write endurance has been used

Pro tip: A single reallocated sector isn't necessarily an emergency, but a count that's steadily climbing over successive checks is a clear signal to back up immediately and plan a replacement.

Step 2: Run a Manufacturer Diagnostic Tool

Most drive manufacturers provide free diagnostic software that runs deeper tests than generic tools:

  • Western Digital: WD Dashboard
  • Seagate: SeaTools
  • Samsung: Samsung Magician
  • Crucial: Crucial Storage Executive
  • Kingston: SSD Manager
  1. Identify your drive's manufacturer and model (visible in Device Manager or on the physical label).
  2. Download the matching tool from the manufacturer's official website.
  3. Run both a short/quick test and, if time allows, a full extended test — the extended test reads every sector and can take several hours on large HDDs.
  4. Note any errors reported and whether the tool recommends replacement.

Step 3: Listen and Watch for Physical Signs (HDDs Only)

  1. With the case open and the PC powered on, listen closely to the suspect drive.
  2. A healthy HDD produces a faint whirring hum and occasional soft clicks during normal read/write activity.
  3. Repetitive loud clicking (sometimes called the "click of death"), grinding, or a burning smell are signs of imminent or active mechanical failure — stop use immediately.

Step 4: Test in Another System (If Possible)

If you suspect the issue might be the SATA cable, port, or power connector rather than the drive itself:

  1. Power down and swap the SATA data cable for a known-good one.
  2. Try a different SATA port on the motherboard, and a different power connector from the PSU if using a splitter.
  3. If possible, test the drive in another PC (as a secondary drive, not booting from it) to see if the same symptoms persist — if they do, the drive itself is the likely culprit.

Step 5: Back Up Immediately If Any Warning Signs Appear

Once you've identified any of the above symptoms, prioritise backing up over further diagnosis.

  1. Back up the most critical files first — documents, photos, project files — to an external drive or cloud storage.
  2. If the drive is still readable but unstable, consider using a cloning tool to create a full image before it degrades further (see our guide on cloning a drive to a new SSD).
  3. Avoid running disk-intensive tasks like defragmentation on a suspected failing drive, as this generates additional read/write stress that can accelerate failure.

Understanding Drive Lifespan

  • HDDs typically last 3–6 years under normal home use, though many run well beyond that; mechanical wear increases sharply after 5+ years of near-constant power-on time.
  • SSDs are rated by total bytes written (TBW) rather than just age, and most consumer SSDs comfortably outlast their warranty period under typical home use, though budget models with lower TBW ratings can wear out sooner under heavy write workloads.

When to Call a Professional

If your drive contains irreplaceable data and shows signs of serious mechanical failure — clicking, grinding, or refusing to be detected — stop trying to fix it yourself. Repeated power cycling or DIY recovery attempts on a mechanically damaged HDD can make professional data recovery more difficult or impossible. A specialist data recovery service, ideally one with a certified cleanroom facility, is the safest route when the data matters more than the cost of recovery. For drives showing early S.M.A.R.T. warnings but still functioning normally, back up promptly and plan a straightforward replacement before it becomes an emergency.

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