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Stop using the USB drive and do not format it if the files matter. Disconnect it, avoid copying anything to it, and recover files to a different physical drive. “Won’t open” can mean deleted files, a damaged file system, an incompatibility, or a failing USB device; the safest recovery method depends on which situation you have.
What “won’t open” can mean
A USB flash drive that fails to open in File Explorer or Finder is not automatically a single type of problem. The same symptom can come from several very different causes:
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- Deleted files: The drive is readable, but files were removed. New writing can occupy the space those files still use.
- File-system corruption: The computer sees the device, but its directory or formatting information is damaged. You may see an “insert a disk” message, an incorrect capacity, or a prompt to format.
- Compatibility or access trouble: A different operating system, port, adapter, or permission issue prevents normal access.
- Physical or controller failure: The USB disconnects, reports wildly incorrect capacity, is not detected at all, or repeatedly becomes unavailable.
These categories overlap. A format prompt, for example, can appear when a file system is unreadable, but it does not prove that formatting is safe or that the files are gone. Treat the files as recoverable until you have deliberately decided otherwise.
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Stop all writes
Disconnect the drive if you do not need to inspect it immediately. Do not copy new files onto it, install software on it, create a new partition, or save recovered files back to it. Deleted data can be overwritten when the operating system reuses space marked as free. Minimizing computer use also reduces the chance that automatic processes write to the source.
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Do not accept a format or erase prompt
Choose Cancel, Eject, or the equivalent option when the operating system says the disk must be formatted or initialized. Formatting may replace file-system structures that recovery software needs. Preserve the source first; reformat only after the important files have been recovered or you have accepted that the data is no longer needed.
Prepare a separate destination
Recovered files need another physical storage device, such as an internal drive or an external hard drive with enough free space. A second partition on the same USB is not a safe destination: it is still part of the source device and can be affected by the same failure. Microsoft’s Windows File Recovery instructions require different source and destination drives, and CGSecurity gives the same preservation advice for TestDisk and PhotoRec.
Avoid repeated attempts on an unstable device
If the USB becomes unusually hot, disconnects when touched, makes repeated connection sounds, shows zero bytes or an implausible capacity, or appears and disappears, stop testing it. Repeated power cycles and scans can make a failing controller or memory chip less accessible. For irreplaceable data, a professional recovery service is safer than experimenting with repair commands.
Perform only non-writing checks
These checks are intended to identify the situation without changing the USB. Do not run a repair operation during diagnosis.
- Try one known-good USB port directly on the computer. Avoid unpowered hubs and questionable adapters.
- Check whether the device appears in the operating system’s disk-management utility, even if it is missing from File Explorer or Finder. Note whether the reported capacity is plausible and whether a volume is present.
- If the drive is recognized, record its assigned drive letter on Windows or its volume name on macOS. Do not guess these values when entering a recovery command.
- Try the drive on another computer only if the data is important and the device is stable. Do not repeatedly reconnect a drive that is disconnecting or showing physical symptoms.
A device that is not detected at all, has the wrong capacity, or is reported as failing may have a hardware or controller problem. The procedures below cannot repair failed flash memory. If the data has high value, stop after these observations and seek professional help.
Recover files on Windows with Windows File Recovery
Microsoft’s Windows File Recovery is a command-line app for Windows 10 and Windows 11. It can attempt recovery from local storage, including USB devices. It does not recover from cloud storage or network shares. Windows 10 support ended on October 14, 2025, but the recovery guidance still identifies Windows 10 and Windows 11 as supported operating systems; use the current version available for your system.
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Install and identify the two drives
- Install Windows File Recovery from Microsoft’s official source on the computer’s system drive, not on the damaged USB.
- Connect the USB and identify its source letter in File Explorer or Disk Management. In the examples below,
E:is the USB source. - Connect a different physical drive with sufficient free space and identify its destination letter. The examples use
D:. Make sureD:is not another partition on the USB. - Close applications that might write to the source and keep normal computer use to a minimum.
Choose the recovery mode
Microsoft maps the mode to both the file system and the type of loss:
| Situation | Mode to try | Reason |
|---|---|---|
| Recently deleted files on a healthy NTFS volume | /regular |
Designed for recent deletion on NTFS. |
| FAT or exFAT USB volume | /extensive |
Microsoft recommends Extensive for FAT and exFAT. |
| Formatted or corrupted NTFS volume | /extensive |
Extensive is the recommended attempt for these cases. |
| Unclear condition or a failed Regular scan | /extensive |
It performs a deeper signature-oriented attempt, although it may take longer and produce less original folder information. |
Run a targeted command first
The general syntax is:
winfr source-drive: destination-drive: /mode /switches
For example, to search an exFAT USB in E: for Word documents and save results to the separate drive D:, open Windows File Recovery and run:
winfr E: D: /extensive /n *.docx
For photographs, you could target common extensions:
winfr E: D: /extensive /n *.jpg /n *.jpeg /n *.png
For recently deleted files on a known healthy NTFS volume, the corresponding first attempt could be:
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Replace the letters and file patterns with values that match your case. Verify them immediately before pressing Enter: reversing source and destination can overwrite the evidence you are trying to preserve. If you need a broad search, omit the /n filter, but expect more output and a longer scan.
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Review the results safely
Windows File Recovery creates a recovery folder on the destination drive. Inspect and open recovered copies from that destination, never from the source USB. Expect that some files may be incomplete, have generic names, or be placed in reconstructed folders. If the first mode finds nothing, do not write anything to the USB; try an Extensive scan with narrower file filters or move to a different recovery method.
Use TestDisk when file-system metadata may still be usable
CGSecurity’s TestDisk is a free, open-source utility. Its undelete procedure supports FAT12, FAT16, FAT32, exFAT, NTFS, and ext2 cases when the deleted data has not been overwritten. TestDisk works with file-system structures and metadata, so it can sometimes preserve original names and directory organization better than a signature-only scan.
Safe operating rules
- Download TestDisk only from the official CGSecurity project documentation.
- Run it against the affected USB, but save every recovered file to a different physical drive and, preferably, a different file system.
- Do not choose options that write a new partition table, repair the file system, or alter boot sectors while your priority is file recovery.
- Use read-only inspection first and stop if the drive begins disconnecting or behaving erratically.
When TestDisk is the better first attempt
Choose TestDisk’s undelete route when the USB is detected with a plausible capacity, you know its file-system type, and the files were deleted or the directory structure is damaged but still partly visible. Its method depends on supported file-system metadata; it is not a guarantee that every file or name will be restored.
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PhotoRec, included in the CGSecurity documentation set, uses file signatures rather than relying on a functioning directory structure. That makes it useful when the file system is unsupported, severely corrupted, or when TestDisk cannot find the desired files.
What to expect
- PhotoRec can recover recognizable content even when folders and directory entries are unavailable.
- Recovered files commonly receive generic names and may not retain their original folder paths.
- You must choose a destination on another physical drive; never select the damaged USB as the output location.
- Filter the file types before scanning when possible. A narrower selection reduces scan time and the amount of irrelevant output.
PhotoRec is not a promise of intact files. A file whose occupied blocks were overwritten may be truncated or unrecoverable, and fragmented files can be harder to reconstruct. Use it as an alternative when a metadata-based approach is insufficient, not as a reason to keep retrying a failing device.
Mac: use Disk Utility First Aid cautiously
Apple’s Disk Utility can check and fix certain formatting and directory-structure errors. First Aid is a repair function, not a file-recovery method, and Apple says it cannot detect or repair every problem.
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- This USB drive provides plug and play simplicity with the included 18 inch USB 3.0 cable
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Run First Aid only after preserving what you can
- Open Applications > Utilities > Disk Utility.
- Choose View > Show All Devices so volumes, containers, and the physical device are visible.
- Select the USB volume and click First Aid, then run it on the relevant container and finally on the physical storage device, following Apple’s order.
- Read the result. If First Aid reports an error it cannot repair, do not repeatedly run it while valuable data remains inaccessible.
If the volume mounts after First Aid, copy important files to another drive immediately. If Disk Utility reports that the disk is about to fail, Apple says it cannot be repaired; back up whatever remains accessible and replace the device. Do not treat a successful First Aid message as proof that deleted files can be recovered.
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A prompt such as “You need to format the disk before you can use it” means the operating system cannot currently read the volume structure. It does not establish whether the files are recoverable. Click Cancel, preserve the USB, and use a recovery method that reads the source without formatting it. Formatting is appropriate only after recovery is complete or the data is no longer required.
If the USB opens on one computer but not another, copy the files to a safe destination while it is readable. Do not use the temporary success as an excuse to continue editing files on the USB; flash storage that is intermittently readable can fail again without warning.
Recognize signs that home recovery is unsafe
Stop software experiments and consider a professional service when any of these conditions apply:
- The USB is absent from every computer or appears with zero capacity.
- Its reported capacity changes between connections or is far smaller than the labeled size.
- It repeatedly disconnects during a scan, becomes hot, or has visible physical damage.
- The files are legally, financially, medically, or otherwise irreplaceable.
- Multiple read-only recovery attempts produce errors while the device’s condition worsens.
No general recovery percentage can be responsibly promised. Success depends on whether the memory cells remain readable, whether the file-system structures survived, and whether deleted blocks were overwritten. A professional service may have hardware-level tools, but availability, price, and outcome vary; obtain a clear assessment before authorizing work.
Common mistakes that reduce recovery chances
Running repair commands before copying data
Repair utilities can change directory structures or other metadata. If the files matter, attempt read-only recovery first and keep an untouched source whenever possible.
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Saving output to the same USB
Even a successful recovery can destroy files that have not yet been scanned if output is written to the source. Use a separate physical destination with enough capacity for the expected results.
Guessing drive letters
Windows drive letters can change when devices are connected or removed. Confirm the source and destination immediately before each winfr command.
Assuming filenames prove success
A recovered directory entry or filename does not prove that the file’s contents are intact. Open copies from the destination and check important documents, photographs, archives, and media before deleting anything from the source.
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Continuing after physical warning signs
Repeated scans, reconnects, or improvised disassembly can turn a marginal device into one that is no longer readable. Stop early when the drive is unstable.
A practical recovery decision path
| What you observe | Safest next step | What not to do |
|---|---|---|
| USB is readable and files were recently deleted | Stop using it, then try Windows File Recovery Regular mode for NTFS or TestDisk undelete. | Do not save new files to the USB. |
| USB uses FAT/exFAT or its file system is corrupted | Use Windows File Recovery Extensive mode or TestDisk; save output elsewhere. | Do not accept a format prompt. |
| File system is unsupported or metadata scans find nothing | Try PhotoRec with file-type filters and a separate destination. | Do not expect original names or folders. |
| Mac recognizes the device but reports directory errors | Copy any accessible files, then use Disk Utility First Aid cautiously. | Do not mistake First Aid for undelete software. |
| Device is absent, unstable, or reports imminent failure | Stop and consider professional recovery for important data. | Do not keep power-cycling or running scans. |
After recovery: make the USB usable again
Only after confirming that the needed files open correctly should you decide whether to erase and reformat the USB. Reformatting removes the existing file-system structures and will not restore files that were missed. If the device showed instability, replace it rather than trusting it with the only copy of important data.
Keep at least one additional backup of important files on a different device or service. A USB flash drive is convenient for transport, but it should not be the sole location for irreplaceable data. Safely eject it from the operating system, protect it from heat and physical damage, and periodically verify that backup copies can actually be opened.
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