Safe HDD repair steps · September 2026

How to Fix HDD Bad Sectors in 2026?

You cannot physically heal a damaged platter with software. You can rescue readable data, rule out connection trouble, mark unusable clusters, then decide if the HDD is safe to reuse.

By Clarkconnect Stories Editorial Team Published · Updated
Quick answer

Back up or image the HDD before trying to repair bad sectors. Use Disk Drill to create a byte-to-byte image, recover important files from that image, then inspect SMART data. Run chkdsk /r only if the drive remains stable.

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Stop using the HDD if it clicks, scrapes, disconnects, or contains irreplaceable files. Repair scans can place sustained load on weak hardware. Do not initialize, format, defragment, or erase the disk before recovery.

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★ Editorial pick ★ 4.4 / 5

Protect Data Before Repair → Disk Drill

Creates byte-to-byte disk images · Scans images instead of repeatedly reading the original HDD · Windows plus macOS

✓ Windows plus macOS ✓ Byte-to-byte backup ✓ File preview before recovery
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Top 5 Methods to Handle HDD Bad Sectors

01

Image the HDD With Disk Drill

Safest first move when files matter more than keeping the old drive in service

~10 min setup
Difficulty Easy
You need Disk Drill plus a healthy destination drive
Works for Windows, Mac

Bad sectors often signal media trouble, so protect the readable data before attempting repairs. Disk Drill can create a byte-to-byte image that you scan without repeatedly stressing the original HDD. (disk-drill.com)

  1. Stop copying files to the affected HDD, then close any apps using it.
  2. Connect a healthy drive with enough free space for an image of the entire problem disk.
  3. Open Disk Drill, select Byte-to-byte Backup, then choose the affected physical HDD.
  4. Save the disk image to the healthy drive. Do not save it on the damaged HDD.
  5. Mount or add the completed image in Disk Drill, scan it, preview key files, then recover them to a separate healthy disk.
Disk Drill Review ↗
i If imaging stalls, the drive disconnects, or new mechanical noises appear, stop rather than forcing repeated reads.
Visit the Disk Drill website
02

Check SMART Data, Cables, Plus Ports

Useful for separating real media damage from a flaky connection

~10 min
Difficulty Easy
You need SMART utility plus a spare cable
Works for Internal or external HDDs

A loose SATA lead, weak USB bridge, or failing power adapter can produce read errors that resemble bad sectors. SMART data also helps show whether the disk is reallocating sectors or waiting to retest unstable ones.

  1. Save a screenshot of the current SMART report before changing anything.
  2. Check Reallocated Sector Count, Current Pending Sector Count, plus Offline Uncorrectable. Raw values above zero deserve caution.
  3. Shut down the computer, then reseat the data cable plus power cable.
  4. For an external HDD, try a short known-good USB cable, another direct USB port, plus the original power supply if one exists.
  5. Read the SMART report again after copying essential data. Rising raw counts point toward a degrading drive, not a one-time Windows error.
i SMART labels differ by drive maker. A passing overall status does not guarantee that every sector is healthy.
03

Run CHKDSK With the Recovery Switch

Reasonable for a stable Windows volume after important files are secured

1–12+ hr
Difficulty Moderate
You need Administrator access
Works for Windows NTFS, FAT, exFAT volumes

CHKDSK can locate unreadable clusters, recover readable information where possible, then keep Windows from using marked clusters. The /r scan reads the full volume, so large HDDs may take many hours. (learn.microsoft.com)

  1. Confirm that important files are backed up or recoverable from the image made in Method 1.
  2. Open Windows Terminal or Command Prompt as administrator.
  3. Run chkdsk E: /r , replacing E: with the correct volume letter.
  4. If Windows says the volume is in use, approve a scan at restart or unmount the non-system volume safely.
  5. Let the scan finish without powering off the PC, then review the summary for bad clusters or unreadable records.
  6. Check SMART data again. Replace the HDD if pending, reallocated, or uncorrectable counts continue climbing.
i CHKDSK repairs file-system records plus marks unusable clusters. It cannot restore damaged magnetic material.
04

Run a Destructive Full-Surface Test

A last test for an empty drive you are willing to erase completely

3–24+ hr
Difficulty Advanced
You need Verified backup plus vendor diagnostic
Works for Empty non-system HDDs

A full write-read test may prompt the HDD firmware to remap weak sectors. This does not heal platter damage, plus it destroys every partition, file, recovery trace, plus backup stored on that disk.

  1. Verify recovered files by opening several documents, photos, archives, plus videos from the destination drive.
  2. Disconnect other storage disks where practical, reducing the chance of erasing the wrong device.
  3. Download the HDD maker's official diagnostic utility, then confirm the affected drive by model plus serial number.
  4. Choose the tool's extended, full erase, or write-read test only after confirming that no data is needed from the disk.
  5. After the test, power-cycle the HDD, inspect SMART raw values, then run another extended read test.
  6. Retire the drive if errors return, SMART counts rise, or the vendor utility reports failure.
i Do not use this method on a drive that still contains the only copy of important files.
05

Replace the HDD or Use a Recovery Lab

The right choice for clicking, repeated disconnects, or worsening sector counts

Varies
Difficulty Easy decision
You need Replacement HDD or recovery service
Works for Physically unstable drives

Some drives are too unstable for software repair. Clicking, scraping, failed spin-up, severe slowness, disappearing capacity, or repeated disconnects are reasons to stop DIY work.

  1. Power down the HDD if it clicks, scrapes, vanishes during reads, or prevents the computer from booting normally.
  2. Write down the model, serial number, symptoms, plus every repair or scan already attempted.
  3. If the files are replaceable, install a new drive, restore your backup, then recycle or securely dispose of the failed unit.
  4. If the files are unique, contact a specialist that performs hardware imaging plus clean-room work where required.
  5. Ask for a written evaluation, expected cost range, return-media policy, plus terms for unsuccessful recovery before authorizing work.
i Repeated power cycles or full scans can reduce the remaining recovery window on a mechanically failing HDD.

When Software Should Not Touch a Failing HDD

Software is the wrong first move if the HDD clicks, scrapes, spins down unexpectedly, reports the wrong capacity, or disappears from BIOS. Power it off. If the files are valuable, preserve its current condition for a recovery specialist.

A slow but steady disk may still be imageable. A disk that repeatedly resets during reads is a different problem, since each retry places more strain on weak hardware.

Choose the Right Method for HDD Bad Sectors

Start with data protection, then move toward repair or replacement.

Method Best for Time Success rate
1. Image the HDD With Disk Drill TRY FIRST Protecting readable files before repair ~10 min setup ● 90%
2. Check SMART Data, Cables, Plus Ports Diagnosing false errors or early failure ~10 min ● 75%
3. Run CHKDSK With the Recovery Switch Stable drives with file-system damage 1–12+ hr ● 70%
4. Run a Destructive Full-Surface Test Testing an empty HDD after recovery 3–24+ hr ● 45%
5. Replace the HDD or Use a Recovery Lab Mechanical failure or recurring errors Varies ● 95%

Which HDD Bad-Sector Method Should You Use?

Start by imaging the affected HDD with Disk Drill if the files have any value. A stable drive with a few logical errors may be suitable for SMART checks followed by CHKDSK, while recurring sector errors usually justify replacement.

Skip repair utilities if the HDD makes unusual sounds, drops offline, or becomes slower with every attempt. Those symptoms make a recovery lab the safer route.

Top pick Disk Drill
Recover first, verify the recovered files on another disk, then test or erase the old HDD. Never reverse that order.

HDD Bad-Sector Questions, Answered

How do I check whether my HDD really has bad sectors in Windows 11?
Open File Explorer, right-click the drive, then open Properties, Tools, and Error checking. For a deeper check, run Command Prompt as administrator and use chkdsk with the /r option so Windows scans for readable problems, maps out damaged areas, then tries recovery.
Can bad sectors on an HDD be fixed permanently?
Sometimes a sector is only temporarily unreadable because of file system corruption, weak magnetic areas, or a flaky cable, so a scan can recover it. If the drive has true physical damage, the sector is usually only marked unusable, not repaired in the literal sense.
What is the safest way to repair bad sectors without losing data?
Back up the drive first, then run a read-only health check if possible, followed by a full surface scan. If the disk is still usable, repair tools like CHKDSK can isolate damaged areas while keeping the rest of the volume accessible.
Should I use CHKDSK /f or CHKDSK /r for bad sectors?
Use /f for file system errors, since it fixes directory and metadata problems. Use /r when you suspect bad sectors because it searches the surface for unreadable blocks, then attempts data recovery.
Why does my HDD keep developing new bad sectors after every scan?
That usually means the drive is physically degrading. A one-time scan can help, but repeated growth in bad sectors is a strong sign to clone the disk, replace it, then stop trusting it for important files.
Is it worth running a low-level format to fix bad sectors on an HDD?
Not usually. True low-level formatting is not something normal users can do on modern drives, and full overwrite utilities only remap weak sectors if the drive firmware still has spare blocks.
How long does a full bad sector scan take on a 2TB hard drive?
It can take many hours, especially on older drives or disks with lots of retries. A surface scan that reads every block is much slower than a quick file check, so plan for an overnight job.
Can I fix bad sectors with BIOS tools before Windows starts?
Some vendors include diagnostics that can trigger a full surface test, which is useful when Windows cannot read the disk well. These tools are good for confirming failure, but they rarely perform a magical repair beyond what the drive firmware already supports.
What should I do first if my HDD makes clicking noises plus bad sectors?
Stop writing to the drive right away, then copy the most important files off it if it still mounts. Clicking plus bad sectors often points to mechanical trouble, so extra scanning can make the situation worse.
How can I tell the difference between logical bad sectors plus physical bad sectors?
Logical problems often appear after an improper shutdown, malware, or a corrupted file system, then may disappear after repair. Physical bad sectors tend to return, expand, or show up in SMART health data even after multiple scans.
Does formatting an HDD remove bad sectors?
A quick format will not fix surface damage. A full format may force the drive to read every area, which can expose weak blocks, but it still cannot heal a worn platter.
What SMART values should I watch for when fixing bad sectors?
Pay attention to Reallocated Sector Count, Current Pending Sector Count, plus Uncorrectable Sector Count. If those numbers are rising, the drive is not recovering well, even if it still opens today.
Can I use third-party disk repair software instead of Windows tools?
Yes, but choose tools that actually read the drive surface instead of just marketing themselves as repair apps. For home use, a trusted diagnostic utility from the drive maker is usually the best first step.
How do I clone an HDD with bad sectors before it dies?
Use a cloning tool that supports retries, skipping unreadable blocks, then image the source disk to a healthy replacement drive. Keep the copy process as gentle as possible because aggressive retries can stress an already unstable disk.
What file recovery method works best when bad sectors block my documents?
Recover the disk image first, not the individual files, if the drive is unstable. After that, run recovery software on the image so every scan happens against a safer copy instead of the failing hardware.
Are bad sectors covered under hard drive warranty in 2026?
Often yes, if the drive is still within warranty terms plus the SMART data shows failure. Check the manufacturer RMA policy, since they usually require diagnostic proof before approving a replacement.
Can I keep using an HDD with a few bad sectors for noncritical storage?
Only if the bad sector count is stable, the data is backed up elsewhere, then the disk passes repeated checks. Even then, use it for temporary or replaceable files, not anything you cannot afford to lose.
What is the best alternative if my HDD is too damaged to repair?
Replace it with a new SSD or HDD, then restore from backup or clone image. If the old drive is making unusual noises or losing sectors fast, replacement is safer than chasing more repairs.
How do I prevent bad sectors from coming back on a new hard drive?
Keep the drive cool, avoid sudden power loss, then shut down the system cleanly. A good surge protector plus regular backups matters more than any repair utility once the disk starts aging.