USB recovery, step by step

How to Recover Data from Corrupted USB Flash Drive? (2026)

A corrupted flash drive is not automatically empty. Start with the least destructive recovery route, save files elsewhere, then repair or replace the USB.

By Ditchnet Articles Editorial Team Published · Updated
Quick answer

Stop writing to the USB, dismiss any format prompt, then create a byte-to-byte image if the device is unstable. Scan that image with Disk Drill, preview the important files, then recover them to a separate drive. Leave CHKDSK or First Aid until after the data is safe.

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Do not format the USB or recover files back onto it. If it keeps disconnecting, gets hot, shows the wrong capacity, or has a damaged connector, stop testing it. Repeated reads can turn a recoverable hardware fault into a dead device.

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Recover Files from a Corrupted USB → Disk Drill

Creates byte-to-byte USB images · Scans RAW or inaccessible storage · Previews found files before recovery · Windows plus Mac

✓ Free scan plus preview ✓ 100 MB free on Windows ✓ Windows plus macOS
Scan the USB →

Top 5 Ways to Recover Data from a Corrupted USB Flash Drive

01

Recover the USB with Disk Drill

Best first move when the drive appears in Disk Management or Disk Utility

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

Use this route when the USB is detected but will not open, appears RAW, requests formatting, or shows missing folders. Disk Drill can scan the device directly, though a byte-to-byte image is safer if the flash drive disconnects, freezes, or reads very slowly.

  1. Stop using the corrupted USB. Do not format it, save new files to it, or accept an operating-system repair prompt.
  2. Install Disk Drill on the computer's internal drive, not on the damaged flash drive.
  3. Open Byte-to-byte Backup, select the USB, then save its image to a healthy disk with free space equal to the USB's full capacity. Skip imaging only if the device reads normally.
  4. Return to Storage Devices, attach the image, select it, then click Search for lost data. Choose Universal Scan for an ordinary USB flash drive.
  5. Review the results by file type, date, or filename. Preview several important files before selecting them.
  6. Click Recover, then save the recovered files to a different physical drive. Never restore them onto the corrupted USB.
Disk Drill Review ↗
i Disk Drill can scan plus preview files for free. The Windows edition currently includes up to 100 MB of free recovery, while larger recoveries normally require a paid license.
Open the Disk Drill website
02

Copy Every File That Still Opens

Quickest option when the USB remains partly readable

~5–30 min
Difficulty Easy
You need A healthy destination drive
Works for Windows, Mac, Linux

A corrupted USB sometimes stays accessible long enough to rescue ordinary files. Copy the irreplaceable material first rather than sorting, renaming, or opening dozens of files on the unstable device.

  1. Connect the USB directly to the computer rather than through an unpowered hub.
  2. Create a new recovery folder on the computer or another healthy external drive.
  3. Copy the smallest, most important folders first. Documents usually move faster than large videos.
  4. If one file causes the transfer to freeze, cancel that item, reconnect the USB once, then continue with another folder.
  5. Open a sample of the copied files from the destination drive to confirm that they are usable.
  6. Use recovery software for files that are missing, unreadable, or blocked by repeated input/output errors.
i A normal copy cannot retrieve deleted files or data hidden behind a damaged file system.
03

Repair the USB with CHKDSK

A Windows-only attempt for logical file-system errors after recovery

~5–45 min
Difficulty Moderate
You need Windows Terminal or Command Prompt
Works for Windows

CHKDSK can repair some directory, allocation, or file-system errors on a USB that has a valid drive letter. It changes the file system while working, so recover or image important data before running it.

  1. Open File Explorer, note the USB's drive letter, then verify it again so you do not target the wrong disk.
  2. Right-click Start, open Terminal (Admin) or Command Prompt (Admin).
  3. Run chkdsk E: /f , replacing E: with the actual USB drive letter.
  4. Let the check finish without unplugging the flash drive, even if progress pauses for several minutes.
  5. Reconnect the USB, then inspect its folders. Look for recovered fragments only after checking the normal folder structure.
  6. Immediately copy any newly accessible files to a healthy disk.
i Do not run CHKDSK first if the USB disconnects, reports the wrong capacity, clicks through an adapter, or contains the only copy of critical data.
04

Run Disk Utility First Aid

The built-in Mac repair route for directory or formatting faults

~5–20 min
Difficulty Easy
You need Disk Utility
Works for Mac

Disk Utility First Aid checks a storage device's formatting plus directory structure, then repairs certain logical errors. As with CHKDSK, use it after copying, imaging, or recovering valuable files because repairs can alter damaged metadata.

  1. Open Disk Utility from Applications > Utilities.
  2. Choose View > Show All Devices so the physical USB plus its volumes appear in the sidebar.
  3. Select the lowest volume beneath the USB, click First Aid, then choose Run.
  4. Repeat First Aid for any remaining volumes, moving upward until you reach the physical USB device.
  5. Eject the USB normally, reconnect it, then check whether the missing folders are accessible.
  6. Copy recovered files to the Mac or another healthy drive before reformatting the USB.
i If First Aid cannot see the physical device, software repair is unlikely to solve a connection or hardware failure.
Read Apple's First Aid instructions
05

Send the USB to a Recovery Lab

Safest choice for broken connectors, heat damage, or unstable hardware

~3–10 days
Difficulty Easy to arrange
You need A data recovery lab
Works for Physically damaged USB drives

A specialist may read the NAND memory directly when the connector, controller, circuit board, or another physical component has failed. This is the expensive route, yet it avoids making severe hardware damage worse through repeated DIY attempts.

  1. Unplug the USB if it becomes hot, smells burned, bends at the connector, disconnects constantly, or reports an obviously incorrect capacity.
  2. Do not open the casing, solder the connector, freeze the drive, or move memory chips yourself.
  3. Photograph the flash drive plus any visible damage before packing it.
  4. Contact a lab that specifically handles USB flash memory, controller failures, plus chip-off or monolith recovery.
  5. Ask about evaluation charges, approval limits, return-media costs, confidentiality, plus what happens if no usable data is recovered.
  6. Pack the device in an antistatic bag or small protective case, then use tracked shipping.
i For legal evidence, business records, or the only copy of family media, a lab may be the sensible first method rather than the last.

When DIY USB Recovery Can Make the Damage Worse

Software methods assume the computer can maintain a reasonably stable connection to the USB. Stop if the device vanishes during every read, heats up quickly, has a cracked connector, appears as zero bytes, or reports a capacity that bears no relation to its label.

Those symptoms often point beyond an ordinary file-system problem. Repeated scans may add wear or prevent a lab from getting the cleanest possible read, so unplug the device plus keep it protected.

Choose a Recovery Method for a Corrupted USB Drive

Start with the least destructive option that matches the drive's condition.

Method Best for Time Success rate
1. Recover the USB with Disk Drill TRY FIRST RAW, inaccessible, formatted, or partly corrupted drives ~15–60 min ● 82%
2. Copy Every File That Still Opens Partly readable USB drives ~5–30 min ● 95%
3. Repair the USB with CHKDSK Windows file-system errors ~5–45 min ● 64%
4. Run Disk Utility First Aid Mac directory or formatting errors ~5–20 min ● 62%
5. Send the USB to a Recovery Lab Broken connectors or physical failure ~3–10 days ● 70%

Which Corrupted USB Recovery Method Should You Use?

Start with Disk Drill if the USB still appears in Disk Management or Disk Utility, especially when it shows as RAW, asks to be formatted, or has missing folders. Create an image first when the device behaves unpredictably, then scan the image rather than stressing the original.

Use a direct copy only for files that remain readable. Save CHKDSK or First Aid for later because repair utilities modify the file system. A physically damaged drive belongs with a flash-memory recovery lab.

Top pick Disk Drill
Recover the irreplaceable files first, verify them from a separate drive, then reformat or replace the corrupted USB instead of trusting it again.

Corrupted USB Recovery Questions

Can data be recovered from a corrupted USB flash drive?
Often, yes. Recovery is possible when the memory still contains the files, even if the file system is RAW, damaged, or inaccessible. Physical failure may require a specialist.
What should I do first when a USB says it needs to be formatted?
Cancel the format prompt. Stop using the USB, then create a byte-to-byte image or scan it with recovery software before attempting repairs.
Will formatting a corrupted USB erase its files?
Formatting creates a new file-system structure, which can overwrite information needed for recovery. A quick format may still leave recoverable content, but recovery should come first.
Can Disk Drill recover a RAW USB drive?
Disk Drill can scan a RAW USB if Windows or macOS still detects the physical device. It can search beyond the damaged file system, then locate files through remaining metadata or file signatures.
Is Disk Drill free for corrupted USB recovery?
Scanning plus file previews are available without paying. On Windows, the free edition currently recovers up to 100 MB. Mac recovery limits differ, so check the current license details before relying on a free recovery.
Why should I create a byte-to-byte USB image?
An image captures readable sectors in one file, reducing the need to scan an unstable USB repeatedly. You can make further recovery attempts against the image while leaving the original device unplugged.
How much free space does a USB image require?
Plan for free space equal to the USB's advertised capacity. A 128 GB flash drive may need roughly 128 GB on the destination disk, even if only part of the USB was used.
Can CHKDSK recover files from a corrupted flash drive?
CHKDSK is a repair utility, not a dedicated recovery tool. It may restore access by fixing file-system errors, though it can also discard damaged records or convert fragments, which is why recovery comes first.
Can Mac Disk Utility recover deleted USB files?
No. First Aid checks plus repairs certain formatting or directory errors. Use recovery software for deleted files, missing partitions, or data that First Aid cannot expose.
Where should recovered USB files be saved?
Save them to the computer's internal disk or another healthy external drive. Writing them to the damaged USB can overwrite files that have not yet been recovered.
Why does my USB show as RAW?
RAW usually means the operating system cannot recognize a usable file system. Common causes include unsafe removal, interrupted formatting, damaged metadata, controller trouble, or failing flash memory.
What if the corrupted USB does not appear in File Explorer?
Check Disk Management on Windows or Disk Utility on Mac. If the physical device appears there with the correct capacity, software may still scan it even though no usable volume is mounted.
What if the USB is not detected anywhere?
Try one known-good port plus one other computer, without repeatedly reconnecting it. If it remains absent from Disk Management or Disk Utility, hardware recovery may be necessary.
Can files come back with different names?
Yes. Signature-based recovery may locate file contents without the original directory records, so names plus folder paths can be lost. Sort recovered files by type, size, date, or preview.
How can I tell whether a recovered file will work?
Preview it before recovery when the software supports previews. After saving it elsewhere, open the copy fully rather than assuming a visible filename means the file is intact.
Should I repair or recover the corrupted USB first?
Recover first whenever the files matter. Repair tools change the damaged file system, while recovery tools are meant to extract data to another location.
Can I keep using the USB after recovering its files?
You can reformat plus test it, but do not trust it with the only copy of anything important. Replace the USB if corruption returns, transfers fail, or the device disconnects unexpectedly.