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.
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.
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.
Recovery-first fix
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Scan the disk → 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
Recover Your Files With Disk Drill Before Repairing the Drive
Safest first move when the unreadable disk contains files you cannot replace
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.
- Stop saving files to the affected disk. If it makes unusual clicking or grinding sounds, disconnect it instead of scanning it.
- Download Disk Drill from the official website, then install it on a healthy disk rather than the corrupted one.
- Connect the problem drive, open Disk Drill, select the physical device, then click Search for lost data.
- Review the scan results. Use previews, file-type filters, or the search box to check whether the files are intact.
- Select the files you need, click Recover, then save them to a different physical drive.
- Open several recovered photos, documents, or videos to verify them before attempting any repair.
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
Check the Cable, USB Port, and Drive Enclosure
Quick diagnosis for external disks that disconnect or fail on one computer
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.
- Shut down any program that may be using the drive, then eject it if Windows still offers that option.
- Disconnect the drive for 30 seconds. Reconnect it directly to the computer instead of through a hub or dock.
- Try another USB port. Use a rear motherboard port on a desktop PC when possible.
- Replace the data cable with a known-good cable of the same type.
- Test the drive on another computer without accepting any prompt to format or initialize it.
- 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
Repair the File System With CHKDSK
Useful after your files are backed up or recovered
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.
- Confirm the affected drive letter in File Explorer or Disk Management. Do not guess, since the command will modify the chosen volume.
- Open Start, type Terminal, then choose Run as administrator.
- Run
chkdsk E: /f, replacingE:with the corrupted volume's actual letter. - If Windows reports bad sectors or read errors, run
chkdsk E: /r. Expect this deeper check to take much longer. - Allow the command to finish without disconnecting the disk or restarting the computer.
- 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
Reinstall the Disk and USB Drivers
Worth trying when the drive works elsewhere but not on this Windows PC
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.
- Right-click Start, then open Device Manager.
- Expand Disk drives, locate the affected device, then confirm its model before making changes.
- Right-click that device, choose Uninstall device, then approve the removal. Do not select any option that refers to erasing disk data.
- 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.
- Restart the computer so Windows reloads the standard drivers.
- 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
Format or Recreate the Damaged Volume
Final software fix once your files are safe or no longer needed
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.
- Recover or restore every needed file to another physical disk.
- Press Windows key + X, then open Disk Management.
- Find the affected disk by its capacity plus model. Double-check that you have selected the correct device.
- If its partition is present, right-click the volume, choose Format, then select NTFS for Windows-only use or exFAT for broad device compatibility.
- If the space is unallocated, right-click it, choose New Simple Volume, then follow the wizard.
- 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
How do I fix “The disk structure is corrupted and unreadable” without losing files?
Stop using the drive right away so nothing gets overwritten. Then try a different USB port, cable, or PC before running a repair tool, since a simple connection issue can trigger this error.
What is the first thing I should do when Windows says the disk is corrupted and unreadable?
Disconnect the drive, restart your computer, then reconnect it only after the system is fully back up. If the drive makes clicking noises or disappears often, treat it as a possible hardware failure.
Can I run CHKDSK to repair a corrupted unreadable disk?
Yes, but only after you back up or recover any important files you still need. CHKDSK can repair file system errors, yet it can also make damaged data harder to recover if the drive is physically failing.
How do I open a corrupted external hard drive in File Explorer again?
Try another USB cable, another port, then another computer to rule out a bad connection. If Windows still refuses to open it, check Disk Management to see whether the drive has a healthy partition or shows as RAW.
Why does my USB drive say the disk structure is corrupted and unreadable?
Common causes include unsafe removal, power loss during file writes, bad sectors, or a damaged file system. A failing flash drive can show the same message even when the files were fine a moment earlier.
Should I format the drive to fix the error?
Only if you do not need any data on it, or after you have recovered everything important. Formatting usually removes the error, but it also erases access to the existing files.
How do I recover files before repairing a corrupted disk?
Use recovery software or a professional recovery service if the data matters a lot. Avoid copying new files onto the drive, since that can overwrite recoverable data.
What does it mean if the disk shows as RAW in Windows?
It usually means Windows cannot read the file system anymore. In that case, do not format it right away if you want the files back, since RAW often points to corruption rather than a total loss.
Can a bad USB port cause the unreadable disk error?
Absolutely. A loose port can interrupt reads or writes, which may make Windows think the disk structure is damaged, so testing a different port is one of the fastest fixes.
How do I repair a corrupted SD card that says unreadable?
Use a card reader on a different computer, then copy any recoverable files off it. If the card is still recognized, a file system repair may help, but SD cards that fail repeatedly are usually safer to replace.
Is it safe to use DiskPart or Disk Management on a corrupted drive?
It is safe for checking status, but be careful with commands that initialize, clean, or format the disk. Those steps can destroy the chance of recovery if you have not saved the data yet.
Why does the error keep coming back after I fix it?
That often means the drive itself is failing, not just the file system. If the problem returns after a repair, clone the disk or replace it instead of trusting it for important storage.
How do I tell if the hard drive is physically failing?
Watch for clicking, repeated disconnects, very slow access, or missing capacity in Windows. Those signs usually point to hardware trouble rather than a simple software issue.
Can I fix the error on an external hard drive that works on one computer but not another?
Yes, and the problem is often the cable, power source, or USB driver on the failing machine. Try the drive on the working computer first, then compare Disk Management results on both systems.
What should I do if CHKDSK says it cannot open the volume for direct access?
Make sure no other app is using the drive, then rerun the command from an elevated Command Prompt. If the disk is still inaccessible, the partition table or file system may be too damaged for CHKDSK alone.
Does reinstalling Windows fix a corrupted unreadable disk?
No, reinstalling Windows usually will not repair a bad external drive or data disk. The issue is usually on the storage device itself, so focus on the drive, not the operating system.
How can I prevent this error from happening again?
Always use Safely Remove Hardware before unplugging removable storage, especially after large file transfers. Keep backups of anything important so a sudden corruption does not turn into a data loss emergency.
What is the best alternative if my drive will not repair?
Your best option is to clone the drive, then recover files from the clone instead of the original. If the data is irreplaceable, a professional recovery lab is safer than repeated DIY repairs.
When should I stop trying to fix the disk myself?
Stop if the drive is clicking, overheating, not detected consistently, or making the same error after every attempt. At that point, repeated repair tries can reduce the odds of getting your files back.