Windows disk repair · August 2026

How to Fix “The Disk Structure Is Corrupted and Unreadable”?

This error usually means Windows cannot read the volume's file-system structure. Start with recovery if the disk holds anything important, then move from low-risk checks to repairs that write to it.

By Ditchnet Articles Editorial Team Published
Quick answer

Do not format the disk or run a repair command until important files are safe. Recover them with Disk Drill first, test the cable plus port, then use CHKDSK. Format the volume only as a last step.

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Stop if the drive clicks, grinds, repeatedly disconnects, or is not shown with the correct capacity. Those signs point to physical trouble. Repeated scans or repair attempts may make recovery harder.

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Top 5 Ways to Fix a Corrupted and Unreadable Disk

01

Recover Your Files With Disk Drill Before Repairing the Drive

Safest first move when the unreadable disk contains files you cannot replace

~15–60 min
Difficulty Easy
You need Disk Drill plus a healthy destination drive
Works for Windows, Mac

File-system repairs can change damaged metadata, so recover important files before running CHKDSK or formatting. Disk Drill can scan a drive that still appears in Windows Disk Management, even if File Explorer cannot open it.

  1. Stop saving files to the affected disk. If it makes unusual clicking or grinding sounds, disconnect it instead of scanning it.
  2. Download Disk Drill from the official website, then install it on a healthy disk rather than the corrupted one.
  3. Connect the problem drive, open Disk Drill, select the physical device, then click Search for lost data.
  4. Review the scan results. Use previews, file-type filters, or the search box to check whether the files are intact.
  5. Select the files you need, click Recover, then save them to a different physical drive.
  6. Open several recovered photos, documents, or videos to verify them before attempting any repair.
Disk Drill Review ↗
i If the drive is unstable, make a byte-to-byte image first, then scan the image instead of repeatedly reading the original disk.
Visit the Disk Drill website
02

Check the Cable, USB Port, and Drive Enclosure

Quick diagnosis for external disks that disconnect or fail on one computer

~5 min
Difficulty Easy
You need Spare cable or USB port
Works for External HDDs, SSDs, USB drives

A bad cable, weak USB hub, loose connector, or failing enclosure can make a healthy file system look unreadable. This check is low risk because it does not write changes to the disk.

  1. Shut down any program that may be using the drive, then eject it if Windows still offers that option.
  2. Disconnect the drive for 30 seconds. Reconnect it directly to the computer instead of through a hub or dock.
  3. Try another USB port. Use a rear motherboard port on a desktop PC when possible.
  4. Replace the data cable with a known-good cable of the same type.
  5. Test the drive on another computer without accepting any prompt to format or initialize it.
  6. For a removable SATA drive, test a compatible enclosure or adapter only if you can do so without forcing connectors.
i A drive that repeatedly vanishes, clicks, spins down, or becomes extremely slow may have hardware damage rather than a simple Windows error.
03

Repair the File System With CHKDSK

Useful after your files are backed up or recovered

~10–90 min
Difficulty Moderate
You need Administrator access
Works for Windows NTFS, FAT, exFAT volumes

CHKDSK checks file-system metadata plus volume errors. The repair switches can modify the disk, so this method belongs after recovery when the files matter.

  1. Confirm the affected drive letter in File Explorer or Disk Management. Do not guess, since the command will modify the chosen volume.
  2. Open Start, type Terminal, then choose Run as administrator.
  3. Run chkdsk E: /f , replacing E: with the corrupted volume's actual letter.
  4. If Windows reports bad sectors or read errors, run chkdsk E: /r . Expect this deeper check to take much longer.
  5. Allow the command to finish without disconnecting the disk or restarting the computer.
  6. Reconnect the drive, then test several folders plus files rather than assuming a successful command fixed everything.
i Do not run CHKDSK first on a failing drive or on the only copy of important files. Its job is file-system repair, not data recovery.
Read Microsoft's CHKDSK documentation
04

Reinstall the Disk and USB Drivers

Worth trying when the drive works elsewhere but not on this Windows PC

~10 min
Difficulty Moderate
You need Administrator access
Works for Windows 10, Windows 11

A damaged storage-controller or USB-device entry can interfere with how Windows mounts a disk. Reinstalling the device entry makes Windows detect the hardware again without erasing the volume.

  1. Right-click Start, then open Device Manager.
  2. Expand Disk drives, locate the affected device, then confirm its model before making changes.
  3. Right-click that device, choose Uninstall device, then approve the removal. Do not select any option that refers to erasing disk data.
  4. Expand Universal Serial Bus controllers. If one external drive is affected, uninstall only its related USB mass-storage entry when you can identify it safely.
  5. Restart the computer so Windows reloads the standard drivers.
  6. Reconnect the disk directly, then check File Explorer plus Disk Management.
i Use the computer or motherboard maker's support page for chipset or storage-controller drivers. Avoid random driver-download sites.
05

Format or Recreate the Damaged Volume

Final software fix once your files are safe or no longer needed

~5–30 min
Difficulty Moderate
You need Disk Management access
Works for Writable drives without hardware failure

Formatting creates a fresh file system, which can return a logically corrupted drive to normal use. It removes access to existing data, so never start here if you still need files from the disk.

  1. Recover or restore every needed file to another physical disk.
  2. Press Windows key + X, then open Disk Management.
  3. Find the affected disk by its capacity plus model. Double-check that you have selected the correct device.
  4. If its partition is present, right-click the volume, choose Format, then select NTFS for Windows-only use or exFAT for broad device compatibility.
  5. If the space is unallocated, right-click it, choose New Simple Volume, then follow the wizard.
  6. Copy a few disposable test files onto the disk, eject it, reconnect it, then confirm those files still open.
i Retire the drive if formatting fails, bad sectors return, or the same corruption message comes back soon afterward.

When Software Cannot Safely Fix an Unreadable Disk

Software is a poor next step if the disk clicks, scrapes, smells burnt, disappears during light use, or reports the wrong capacity. Disconnect it. A recovery lab is more appropriate when the contents justify the cost.

Encryption changes the situation too. Keep the BitLocker recovery key, do not initialize the drive, plus avoid deleting a partition merely because Windows labels it RAW.

Choose the Right Fix for a Corrupted and Unreadable Disk

Protect irreplaceable files first, then work down the list.

Method Best for Time Success rate
1. Recover Your Files With Disk Drill Before Repairing the Drive TRY FIRST Important files on an inaccessible disk ~15–60 min ● 85%
2. Check the Cable, USB Port, and Drive Enclosure External drives with unstable connections ~5 min ● 45%
3. Repair the File System With CHKDSK Logical file-system errors after recovery ~10–90 min ● 70%
4. Reinstall the Disk and USB Drivers A disk that works on another PC ~10 min ● 40%
5. Format or Recreate the Damaged Volume Reusable disks with no files left to save ~5–30 min ● 90%

Which Corrupted Disk Fix Should You Try?

Recovering files with Disk Drill is the right first move if the unreadable disk contains photos, work, or anything else without a backup. If the data is already safe, check the physical connection before running CHKDSK. Reinstall drivers when the problem is limited to one PC, while formatting is for a disk you are prepared to erase.

Top pick Disk Drill
Recover to a separate physical drive, verify several files, then make one repair attempt instead of cycling through commands on the only copy of your data.

Common Questions About Corrupted and Unreadable Disks

What does “The Disk Structure Is Corrupted and Unreadable” mean?
Windows can see a storage device but cannot interpret its file-system structure reliably. The cause may be damaged metadata, an interrupted write, bad sectors, a poor connection, or failing hardware.
Does this error mean my files are gone?
Not necessarily. The directory structure may be unreadable while much of the underlying file data remains recoverable. Avoid writing to the disk until you have scanned it or made an image.
Should I run CHKDSK first?
Only if the files are backed up or unimportant. CHKDSK repairs the file system by changing disk metadata, which can complicate later recovery in some damaged-volume cases.
Can Disk Drill scan a corrupted or RAW drive?
It can scan many devices that appear in the operating system even when the file system is RAW or inaccessible. Results depend on the disk's physical condition plus how much data remains readable.
Where should I save recovered files?
Save them to a different physical disk. Recovering onto the damaged source can overwrite other files that have not yet been restored.
Can I fix the error without formatting?
Sometimes. A replacement cable, another port, a driver reinstall, or CHKDSK may restore access. Recover important files before trying any option that modifies the volume.
Will formatting permanently erase the data?
Formatting removes the file-system records Windows uses to locate files. Some data may remain recoverable after a quick format, but recovery becomes less certain once new files are written.
What is the correct CHKDSK command for this error?
Use chkdsk E: /f , replacing E with the correct drive letter. The /r switch adds a sector scan, which takes longer plus places more read stress on the device.
What if CHKDSK says the file system is RAW?
CHKDSK usually cannot repair a volume it cannot recognize as a supported file system. Recover the files first, then recreate or format the volume once the recovery is complete.
Why does the corrupted drive have no letter?
Windows may have failed to mount the volume, or its partition information may be damaged. Check Disk Management, but do not create a new volume or initialize the disk while files still need recovery.
Could a USB cable cause the unreadable disk message?
Yes. An unstable cable, underpowered hub, damaged port, or faulty enclosure can interrupt reads plus produce misleading storage errors. A direct connection with a known-good cable is a sensible early test.
How do I know whether the drive has physical damage?
Warning signs include clicking, grinding, repeated disconnections, very slow reads, a burning smell, or an incorrect capacity. Disconnect the device if any of these appear.
Can I repair an unreadable SD card the same way?
The recovery-first rule still applies. Use a reliable card reader, recover files to another disk, then format the card in the camera or device that normally uses it.
Why did the error return after CHKDSK fixed it?
Recurring corruption can indicate bad sectors, unsafe removal, power loss, a failing enclosure, or a dying drive. Replace the storage device rather than trusting it with the only copy of important files.
Can File History restore files from the corrupted disk?
File History may restore earlier copies if it was configured before the failure plus the backup drive remains available. Restore those copies to healthy storage instead of the damaged disk.