데이터 손실 없이 손상된 USB 드라이브를 복구하는 방법
A corrupted USB drive may appear as RAW, become inaccessible, disappear from File Explorer, or show the message “You need to format the disk before you can use it.” If you are searching for how to fix corrupted USB drive problems without losing important files, the first step is to avoid formatting the drive or writing new data to it.
In many cases, USB corruption is caused by file system errors, unsafe removal, driver problems, or partition damage rather than complete hardware failure. If the drive still contains important files, you can use Magic Data Recovery to scan the corrupted USB and recover accessible data before attempting repairs.
This guide explains how to fix a corrupted USB drive in Windows 11/10 using safe methods for RAW drives, inaccessible USB devices, missing drive letters, driver errors, and USB drives that keep asking to be formatted. You can also explore more USB troubleshooting and recovery solutions in our USB 플래시 드라이브 솔루션.
Windows 7/8/10/11 및 Windows Server 지원
목차
손상된 USB 드라이브를 수정하는 방법을 알아야 하는 이유
In addition to hardware wear, software glitches often cause logical corruption. For instance, removing a drive without clicking “Safely Remove Hardware” frequently leads to file system errors. Because of this, Windows might mark the drive as RAW. If you identify USB corruption early, you can prevent permanent data loss and extend the lifespan of your hardware devices significantly.
Why Does a USB Drive Become Corrupted?
USB drive corruption can occur for several reasons. Some involve only the file system and can often be repaired with software, while others indicate that the flash memory or hardware itself is beginning to fail.
안전하지 않은 제거
Unplugging a USB drive while Windows is still writing data can interrupt file system updates. This may damage directory information, partition data, or individual files and leave the drive inaccessible the next time it is connected.
Interrupted File Transfers or Formatting
A sudden shutdown, power loss, system crash, or accidental disconnection during a file transfer or formatting operation can leave the file system in an inconsistent state.
파일 시스템 또는 파티션 오류
Damage to FAT32, exFAT, or NTFS structures can cause Windows to report the USB drive as RAW, inaccessible, or in need of formatting. Partition table problems can also prevent the volume from mounting correctly.
바이러스 또는 멀웨어 감염
Malware can hide files, change file attributes, delete data, or damage file system structures. In some cases, the USB may appear empty even though the files still physically exist on the drive.
File System Compatibility Issues
A USB drive formatted with a file system that is not fully supported by the connected operating system or device may appear unreadable. This does not always mean the drive is corrupted, so test it on a compatible system before attempting repairs.
Aging Flash Memory or Bad Blocks
USB flash memory has a limited number of write cycles. As NAND cells wear out, the drive may develop unreadable blocks, become read-only, disconnect unexpectedly, or repeatedly corrupt stored files.
물리 피해
A bent USB connector, damaged circuit board, failed controller, or electrical damage can prevent the drive from being detected correctly. Software repair methods cannot fix this type of physical failure.
How to Choose the Right Fix for a Corrupted USB Drive
| USB symptom | 가능성 있는 문제 | 가장 좋은 첫 번째 조치 |
|---|---|---|
| USB opens but files show errors | Minor file system corruption | Back up files, then run Error Checking/CHKDSK |
| USB shows RAW | 파일 시스템 손상 | Recover data first; do not format immediately |
| “디스크를 포맷해야 합니다” | File system/partition corruption | Cancel formatting and recover files first |
| USB appears in Disk Management but not Explorer | Missing/conflicting drive letter | 새 드라이브 문자 할당 |
| USB shows “Access denied” | Permission/file system issue | Check access and file system status |
| USB is not recognized | Driver, USB port, controller, or hardware issue | Try another port/PC, then reinstall driver |
| USB shows 0 bytes/No Media | Controller/NAND failure possible | Avoid repeated software repairs |
| USB disconnects repeatedly | Connection or physical failure | Stop using it and check hardware |
Before You Repair a Corrupted USB Drive: Protect Your Data First
If the USB drive contains files you cannot afford to lose, recover or copy them before attempting repairs whenever possible.
Some Windows repair tools modify the file system while correcting errors. Formatting goes further by creating a new file system. For this reason, the safest workflow is:
Recover important files → Repair the USB drive → Reformat only if necessary
If Windows can still detect the physical USB device but the partition is RAW, inaccessible, or asking to be formatted, Magic Data Recovery can scan the drive for recoverable files without requiring you to format it first.
Save recovered files to your computer or another storage device rather than back to the damaged USB drive.
How to Recover Data from a Corrupted USB Drive Before Repair
If your corrupted USB drive contains important files, recovering them before running major repairs is usually the safest approach. This is especially important when the drive appears as RAW, asks to be formatted, becomes inaccessible, or suddenly loses files.
Magic Data Recovery can scan USB flash drives affected by file system corruption, accidental formatting, deleted files, missing partitions, and other logical data loss problems. It supports more than 5,000 file types, including documents, photos, videos, audio files, archives, and more.
Windows 7/8/10/11 및 Windows Server 지원
Step 1: Connect the Corrupted USB Drive
Connect the USB drive to your Windows computer. If Windows can still detect the physical device, even if the partition is RAW or inaccessible, launch Magic Data Recovery.
Step 2: Select the USB Drive and Start Scanning
Locate the affected USB drive in the device list and start the scan. The software searches the drive for existing files as well as data that is no longer accessible through File Explorer.
Step 3: Preview the Recoverable Files
After scanning, browse the detected folders or use the file type and search filters to locate important files. Preview supported files when possible to verify that they are intact before recovery.
Step 4: Recover Files to Another Drive
Select the files you need and save them to your computer’s internal drive or another healthy storage device.
Do not save recovered files back to the corrupted USB drive because writing new data to the same device may overwrite other recoverable files.
Once your important files are safely stored elsewhere, you can continue with CHKDSK, formatting, or other repair methods without putting the original data at unnecessary risk.
How to Fix a Corrupted USB Drive: 6 Methods
방법 1: 다른 USB 포트나 컴퓨터를 사용해 보세요
Before changing the file system or running repair commands, rule out a simple connection problem. A faulty USB port, unstable USB hub, or temporary Windows issue can sometimes make a healthy flash drive appear corrupted or inaccessible.
Try these quick checks first:
Disconnect the USB drive and connect it to another USB port.
If you are using a USB hub, connect the drive directly to the computer.
Restart Windows and reconnect the USB drive.
Test the USB drive on another computer if possible.
If the drive works normally on another PC, the problem is more likely related to the original computer’s USB port, driver, or Windows configuration. If the same errors occur on multiple computers, continue with the methods below to check the USB drive itself.
Method 2: Run Windows Error Checking for Minor USB Errors
무엇보다도 가장 신뢰할 수 있는 내부 도구는 CHKDSK 유틸리티를 사용하세요. Windows는 논리 오류를 검사하고 복구하기 위해 특별히 이 명령줄 도구를 제공합니다. 시작하려면 다음 단계를 따르세요:
- Windows 검색창에 “cmd”를 입력하고 관리자 권한으로 실행합니다.
- 다음 명령을 입력합니다.
chkdsk X: /f(X를 USB 드라이브 문자로 바꿉니다). - Enter 키를 누르고 프로세스가 완료될 때까지 기다립니다.
As a result, this process often resolves minor corruption. Therefore, it can resolve minor file system errors and restore normal access to the drive.
Method 3: Reinstall the USB Driver When the Drive Is Not Recognized
Win + X → Device Manager → Disk drives → USB device → Uninstall device → disconnect USB → restart PC → reconnect
If the USB works on another computer, the problem is more likely related to your Windows configuration, USB controller, or driver than to the flash drive itself.
Method 4: Assign a New Drive Letter in Disk Management
Win + X → Disk Management → right-click USB partition → Change Drive Letter and Paths → Change/Add → choose an unused letter → OK
Use this method when the USB appears in Disk Management but does not appear correctly in File Explorer.
Method 5: Fix a RAW USB Drive Without Losing Data
If your USB drive appears as RAW instead of NTFS, FAT32, or exFAT, Windows can detect the device but cannot recognize its file system. You may also see an error such as “You need to format the disk before you can use it.”
Do not format the USB immediately if it contains important files.
First, check the drive in Disk Management:
- 프레스 승리 + X 을 클릭하고 디스크 관리.
- Locate your USB drive by checking its capacity and drive letter.
- 이것을 보세요 파일 시스템 column. If it shows RAW, the file system is damaged or unreadable.
- If important files are still on the drive, recover them before formatting or making major changes to the partition.
다음을 사용할 수 있습니다. Magic Data Recovery to scan a RAW or corrupted USB drive and save recoverable files to another storage device.
After your files are safe, right-click the RAW partition in Disk Management, select 형식, and create a new NTFS, FAT32, or exFAT file system.
중요: If the USB drive shows “No Media,” reports an incorrect capacity such as 0 bytes, or repeatedly disconnects from the computer, the problem may involve hardware rather than ordinary file system corruption.
Method 6: Format the USB Drive After Recovering Your Files
If the methods above cannot restore normal access to the USB drive, formatting can rebuild the file system and resolve persistent logical corruption.
However, formatting should be your last resort when important files are still stored on the USB drive. Recover or back up your data first whenever possible.
To format the USB drive in Windows:
열기 파일 탐색기 를 클릭하고 USB 드라이브를 마우스 오른쪽 버튼으로 클릭합니다.
선택 형식.
Choose an appropriate file system:
FAT32: Best for broad compatibility with older computers, cameras, game consoles, and other devices. Individual files cannot exceed 4 GB.
exFAT: Recommended when you need compatibility between Windows and macOS and want to store files larger than 4 GB.
NTFS: Suitable mainly for Windows environments and supports large files, permissions, and other Windows features.
Leave 빠른 포맷 selected for normal logical corruption.
클릭 시작 and confirm the operation.
After formatting is complete, reconnect the drive and test whether you can create, copy, open, and delete files normally.
Keep in mind that formatting repairs the logical file system. It cannot repair failing NAND memory, a damaged USB controller, or a physically broken connector. If the USB continues to disconnect, becomes read-only again, or develops new errors after formatting, replacing the drive is usually safer than continuing to store important data on it.
How to Prevent USB Drive Corruption
- Eject the USB safely: Always use “Eject” or “Safely Remove Hardware” before unplugging the drive.
- Avoid interrupting file transfers: Do not remove the USB or shut down the computer while files are being copied.
- Keep backups of important files: Do not rely on a USB drive as the only storage location.
- Scan for malware regularly: Use updated antivirus software, especially if the USB is used on multiple computers.
- Replace unstable drives: If the USB frequently disconnects, becomes read-only, or repeatedly shows errors, back up the data and replace it.
These habits can reduce the risk of USB corruption and unexpected data loss.
결론
알기 how to fix corrupted USB drive problems starts with identifying the type of failure. If the issue is caused by a USB port, driver, missing drive letter, or minor file system error, Windows tools may be enough to restore access. RAW partitions and drives that repeatedly ask to be formatted require more caution, especially when important files are still stored on the device.
If data matters, recover it before formatting or making major changes to the file system. Magic Data Recovery can scan corrupted, RAW, formatted, or inaccessible USB drives and recover files to another safe location.
After your files are protected, you can repair or reformat the USB drive as needed. If the device continues to disconnect, reports incorrect capacity, or is not detected by Disk Management, consider the possibility of physical hardware failure.
For more troubleshooting, repair, and recovery guides, visit our USB 플래시 드라이브 솔루션.
Windows 7/8/10/11 및 Windows Server 지원
자주 묻는 질문
Can a corrupted USB drive be fixed without losing data?
How do I fix a corrupted USB drive without formatting?
How do I fix a RAW USB drive?
Why does Windows say my USB drive needs to be formatted?
Does CHKDSK fix a corrupted USB drive?
Can I recover files before repairing a corrupted USB drive?
Can software repair a physically damaged USB drive?
Can I reuse a corrupted USB drive after repairing it?
