Corrupted USB Recovery: How to Recover Files From a Corrupted Flash Drive
Do you suspect that your USB drive has become corrupted but still has important files on it? Corruption isn’t always easy to recognize because a corrupted USB can show up in several ways: your files may suddenly become inaccessible, the drive may appear as RAW, or Windows may ask you to format it before you can use it, and so on.
While it’s often possible to recover files from a corrupted flash drive, what you do next matters – formatting the USB, attempting repairs, or continuing to use it can reduce your chances of getting the data back. In this guide, we’ll show you how to safely recover your files first and then repair the USB afterward.
Is It Possible to Recover Important Files From a Corrupt Flash Drive?
Yes, it may be possible to recover files from a corrupted USB, depending on the type and severity of the damage. The most important thing you can do if you discover that you have a corrupted USB flash drive is to stop using the device immediately. This gives you the best chance of successfully recovering the missing data from the device. Continued use of the drive can cause further corruption or overwrite data that could otherwise be recovered. Stop using the USB immediately to maximize your chances of recovering the files.
Data loss can strike at any time. It’s never a pleasant experience and can be devastating depending on what kind of data is lost. You may have just lost the only videos of your child’s first steps or some files that contain other irreplaceable memories. If you use portable storage devices, the time may come when you have to retrieve files from a corrupted flash drive. Remain calm, stop using the drive, and assess its condition before attempting recovery. In many cases, lost data can still be recovered.
| Possible Cause / Condition | Recovery Chances | Recommended Recovery Method |
| File system corruption, but the USB is still detected with the correct capacity | High | Create a byte-to-byte backup, then scan the image or USB with data recovery software. |
| USB appears as RAW or Windows asks to format it | Medium-High | Do not format it. Create an image first, then use data recovery software to recover the files. |
| Files are missing or hidden, but the USB opens normally | High | Check hidden-file attributes, malware-related changes, and use ATTRIB if appropriate. |
| Partition is damaged, lost, or shown as Unallocated, but the USB is detected with the correct capacity | Medium-High | Recover files with data recovery software first; partition-repair tools such as TestDisk can be considered afterward. |
| Minor file-system errors, such as those that can occur after unsafe removal or interrupted writes | Medium-High | Recover or image the data first, then repair the file system with CHKDSK or other repair tools. |
| USB has unreadable areas or becomes unstable during access | Medium-Low | Create a byte-to-byte image if the drive remains stable enough to read. Avoid repeated scans of the original device. |
| USB reports 0 bytes, No Media, or an obviously incorrect capacity | Low | Software recovery is unlikely to work; professional data recovery may be required. |
| USB connector or PCB is physically damaged | Low | Stop using the device and consider a professional recovery service. |
| USB controller or NAND memory is failing | Low-Very Low | Professional recovery may be required, especially for important data. |
| Files have been overwritten after corruption or deletion | Very Low- Impossible | Overwritten data generally cannot be recovered; check backups or cloud copies instead. |
| USB was quick-formatted after the corruption occurred | Medium-Low | Recovery software may still find data, provided the data has not been overwritten. |
What to Do Before Recovering Data From a Corrupted USB
Before you start corrupted USB recovery, there are a few precautions worth taking. What you do at this stage can affect how much data you’ll be able to recover from the USB stick or flash drive, so avoid making any changes to the device until your important files are safe.
- Stop using the USB immediately. Don’t copy, save, or create any new files on it. New data can overwrite deleted or otherwise recoverable files.
- Don’t format, initialize, or repair the drive yet. In particular, avoid running CHKDSK before recovery. These operations modify the file system and can make some data harder to recover. Leave any repair attempts until after you’ve recovered the files you need.
- Avoid repeatedly reconnecting an unstable USB. If the flash drive keeps disconnecting, freezing, or behaving inconsistently, repeated attempts to access it can put additional stress on a failing device.
- Rule out a simple connection problem. Try another USB port and, if possible, another computer. This can help determine whether the problem is with the USB itself or the connection.
- Check the drive in Disk Management. Right-click Start and select Disk Management, then check whether the USB appears and whether Windows reports its correct capacity. This can also show whether its partition is recognized, RAW, or Unallocated.
- Create a byte-to-byte backup if the drive is unstable but still readable. A sector-by-sector image gives you a copy to scan instead of repeatedly reading from the original flash drive.
- Recover files to another physical drive. Never save recovered data back to the corrupted USB stick. Use your computer’s internal storage or another external drive instead.
How to Recover a Corrupted USB Flash Drive
When a corrupted USB is still detected by Windows, data recovery software may be able to retrieve files even when the drive itself is inaccessible. This applies to many cases of logical corruption, including USB drives that appear as RAW or prompt you to format them.
When it comes to USB recovery software, Disk Drill is usually our go-to choice. It can scan a corrupted USB even if it is not shown in File Explorer, as long as Windows can still detect the device. It also supports RAW USB drives and flash drives that ask to be formatted. In this section, we’ll take a closer look at how to use Disk Drill to retrieve files from a corrupted USB drive.
To recover files from a corrupted flash drive you need to:
- Download and install Disk Drill for Windows.
- Connect the corrupted thumb drive to your computer and launch the application.
- Select the USB drive from the list of disks in the app’s window.
- Click Search for lost data to start scanning the flash drive.
- Select Universal Scan when Disk Drill asks you to choose a scanning method.
- Preview the files that Disk Drill can recover.
- Choose the files you want to restore and click Recover.
- Choose a recovery location on a different drive, then click Next to recover the selected files.
These simple steps enable you to recover corrupted flash drive files like your valuable photos and videos. Recovering the data does not itself repair the corrupted drive. Once your files are safe, you can attempt to repair or reformat the USB separately.
Data recovery software is often useful when a logically corrupted USB remains detectable and no usable backup is available. If no backup or other intact copy exists, data recovery software may be necessary to retrieve files that were actually deleted or lost. When faced with the prospect of losing important or personally valuable files, data recovery software is a cost-effective alternative to sending the disk to a professional recovery service.
Disk Drill is a data recovery and protection application that can recover files from many logically corrupted flash drives. It does not repair the USB simply by recovering its data. It uses sophisticated scanning techniques that can efficiently recover files in over 400 different formats. This includes hundreds of common audio, video, image, document, and other file formats. In addition to helping you restore files from flash drives, Disk Drill can recover data from many types of storage devices, including internal and external drives, USB flash drives, and memory cards.
There are additional data protection features provided at no cost by Disk Drill’s developers. Recovery Vault can monitor a selected drive or partition and retain metadata about deleted files, making accidental-deletion recovery easier when the feature was enabled beforehand. Disk Drill can also create byte-to-byte image, allowing subsequent recovery attempts to be performed on the image instead of repeatedly scanning the original device.
Disk Drill supports a wide range of logical data-loss scenarios, from accidentally deleted files to formatted or corrupted storage devices. It’s a versatile recovery tool that deserves to be in your software toolbox.
Identifying and Debugging Common USB Flash Drive Problems
Here are some issues that you may face when using USB flash drives along with a solution that might help you resolve the problems.
1. No power to the USB: Broken Stems, Connectors & Dead Drives
If your USB shows no signs of power and isn’t detected by Windows, the problem may be with the USB port or the drive itself. A damaged connector, broken PCB, failed controller, or other hardware issue can prevent the USB from establishing a connection with the computer.
Solution: Test another known-working port or computer first. If the connector is loose or physically damaged, avoid moving or wiggling it repeatedly. For important data, stop using the device and consider professional recovery.
2. “Please Insert Disk into Removable Disk” Error
Solution: There are a couple of ways to troubleshoot this issue. Try the USB drive in another port or computer to determine whether the problem is specific to the original system or the USB itself. In some cases, assigning or changing the USB drive letter can restore access when the existing drive-letter assignment is missing or conflicting. If the volume is healthy but has a missing or conflicting drive letter, assigning another letter may resolve the issue. If Disk Management shows No Media or 0 bytes, changing the drive letter is unlikely to help.
3. Undetectable USB Flash Drive Error
Solution: This is another case where you should try connecting the drive to a port that you know is operating correctly. You might have a damaged drive that will not work no matter where it is plugged in. Open Device Manager and check whether the USB appears there. If it is disabled, enable it; otherwise, check its device status/error code and troubleshoot accordingly. If Disk Management shows a healthy USB volume without a drive letter, assign it an unused drive letter.
4. USB Flash Drive File System Errors
File system corruption can prevent Windows from working with a USB flash drive normally even when the device itself is still detected. You may encounter errors when opening files, notice that some folders are inaccessible, or experience other problems while reading data from the drive. If the file system is still recognized by Windows, CHKDSK may be able to repair these logical errors.
Solution: Before you run CHKDSK, recover any important files from the USB flash drive, since the command makes changes to the file system during repair. Once your data is safe, open Command Prompt as administrator and enter chkdsk H: /f, replacing H with the drive letter of your USB. CHKDSK will scan the file system for errors and attempt to fix the problems it finds. Do not run it if the USB is shown as RAW, since CHKDSK requires a file system that Windows recognizes.
5. USB Drive Shows as RAW
A USB drive may appear as RAW when Windows can detect the device but can no longer recognize its existing file system. In this case, Windows may ask you to format the drive when you connect it, your files may become inaccessible, or Disk Management may list the USB partition as RAW. If the drive still contains important data, don’t accept the format prompt. CHKDSK generally won’t help in this situation either, since it can’t operate normally on a volume Windows recognizes as RAW.
Solution: Recover or image the USB drive first using data recovery software, and save the recovered files to another drive. Once you’ve secured the data you need, you can format the USB to create a new file system and make the drive usable again. You can do this through File Explorer or Disk Management.
6. USB Drive Shows as Unallocated
If your USB appears as Unallocated in Disk Management, Windows can detect the physical device but can’t see a usable partition on that space. This may happen because of partition-table corruption, accidental partition deletion, or other logical damage.
Solution: Don’t create a New Simple Volume or format the USB before recovery, as this writes new partition and file-system information to the drive. Instead, scan the physical USB or a byte-to-byte image with data recovery software and save the recovered files elsewhere. After recovery, you can create a New Simple Volume in Disk Management and format the new partition if the USB is otherwise healthy.
7. “You Need to Format the Disk Before You Can Use It” Error
The “You need to format the disk before you can use it” message usually means Windows detects the USB but can’t correctly read its file system. The underlying problem can vary, so the drive may appear as RAW, Unallocated, or show another abnormal state in Disk Management.
Solution: Click Cancel rather than Format disk, then check the USB in Disk Management. Recover your files before attempting any repair or formatting, and create a byte-to-byte image first if the drive is unstable. Once the data is safe, you can format the USB if necessary.
8. USB Drive Is Write-Protected
When a USB drive becomes write-protected, you may still be able to open and copy existing files, but Windows won’t let you modify or delete them, add new files, or format the drive. Some USB devices have a physical write-protection switch, while unexpected permanent write protection can also indicate controller or NAND flash failure.
Solution: Check for a physical write-protection switch first, then verify whether Windows reports the disk or volume as read-only. If the protection appeared unexpectedly and can’t be removed, copy or recover your important files while the USB is still readable. Persistent write protection can indicate hardware failure, in which case replacing the drive is safer than continuing to use it.
9. USB Shows 0 Bytes, “No Media,” or the Wrong Capacity
A USB that reports 0 bytes, No Media, or a capacity dramatically different from its actual size may have a more serious problem than ordinary file-system corruption. These symptoms can indicate failure of the USB controller, NAND flash memory, or other hardware that prevents Windows and recovery software from accessing the underlying storage.
Solution: Try another USB port and another computer, then check the device and its reported capacity in Disk Management. If it continues to show 0 bytes, No Media, or an incorrect capacity, don’t format, initialize, or repeatedly scan it. If the underlying storage remains inaccessible and the files are important, contact a professional data recovery service.
10. USB Keeps Disconnecting and Reconnecting
Repeated disconnects can point to several problems, including a damaged connector, unstable USB controller, insufficient power, or failing flash memory. An unstable USB is particularly risky for data recovery because every new scan requires the original device to remain connected and readable.
Solution: Connect the USB directly to another port on the computer instead of using a hub, then test it on another computer. Inspect the connector for dirt or visible damage and clean it carefully if necessary. If the USB itself remains unstable but stays readable long enough, create a byte-to-byte backup as soon as possible and scan the image instead. Stop using the device if it becomes hot or causes Windows to freeze; for important data, consider professional recovery.
11. “USB Device Not Recognized” Error
Windows may display “USB device not recognized” when it has trouble communicating with the USB device. The cause can be a Windows driver or device configuration issue, but the same message can also appear when the USB itself has a hardware problem.
Solution: Try another USB port and computer first. If the error remains, open Device Manager, locate the problematic device (often marked with a warning icon), and open Properties > Device status to check its error code. Troubleshoot that specific error, which may include reinstalling or updating the device driver. If Windows still can’t detect the underlying storage, treat it as a possible hardware failure and consider professional recovery for important data.
12. USB Is Detected but Does Not Appear in File Explorer
Sometimes Windows detects a USB drive, but it doesn’t appear in File Explorer because its partition has no drive letter assigned. However, a missing drive letter isn’t always the cause. The drive may instead have a damaged file system or partition and appear as RAW or Unallocated in Disk Management.
Solution: Open Disk Management and locate your USB. If it has a healthy partition but no drive letter, right-click the partition, select Change Drive Letter and Paths, and assign an unused letter. If the USB appears as RAW or Unallocated, don’t try to solve the problem by assigning a drive letter. Recover the data first and follow the appropriate RAW or Unallocated recovery procedure described above.
13. Files and Folders Disappeared but the USB Still Shows Used Space
If your USB still shows used space but some or all files and folders have disappeared, they may have been marked as Hidden or System, potentially because of malware. First, open the USB in File Explorer and select View > Show > Hidden items to see if the missing files become visible.
Solution: If the files appear after enabling hidden items, check their attributes. You can also use the attrib -h -r -s H:\*.* /s /d command in Command Prompt, replacing H: with your USB drive letter, to remove Hidden, Read-only, and System attributes from existing files and folders. Then scan both the USB and your computer for malware. If the files are still missing, stop using the drive and use data recovery software to see if they can be recovered.
Tips to Protect Your USB Flash Drive From Future Damage
Taking proper precautions can minimize the risk of data loss from your flash drives. USB flash drives can be damaged by physical stress, excessive heat, moisture, connector damage, or electrical problems, so they should be handled carefully. Here are some tricks that can help you preserve your USB flash drives and the data they contain.
- Store your flash drives in a container to protect them from being dropped or broken in your pocket or bag.
- Avoid extreme heat or moisture as both of these conditions can lead to drive failure or data corruption.
- Remove the drive from your computer or mobile device when not in use and cap it or close it to protect the connector and contacts.
- Eject the drive to safely remove it from your computer. Do not simply pull it out of the USB port.
- Reduce malware risk by connecting the USB only to computers you trust and that are protected against malicious software.
- Avoid keeping the only copy of important files on a USB drive, and do not disconnect the drive while files are being written or modified. Do not manually defragment a USB flash drive. Flash storage does not benefit from traditional defragmentation in the same way as an HDD, and unnecessary writes contribute to flash-memory wear.
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Jeff Cochin is a data management and recovery professional, who has been with Pandora Data Recovery Mentor for nine years and has always been an essential part of the team. Jeff also works as a technical writer at Macgasm, being a first hand in testing, trying and writing about big and small tech software.
- Frisco, Texas, United States
Yevgeniy Tolkunov is Hardware Engineer at ACE Data Recovery. Yevgeniy has a Master's Degree in Physics, Information Technology; 15+ years of experience.