My USB drive suddenly shows a “needs to be formatted” error when I connect it. It contains important files, so I need help accessing or recovering the data without formatting the drive and losing everything.
Cancel the format prompt and stop using the USB drive for now. That message does not necessarily mean the files are gone. More often, Windows can no longer read the drive’s file system, so it treats the drive as RAW and suggests creating a new one through formatting.
This can happen after an interrupted transfer, a power loss, file system corruption, or unplugging the drive without ejecting it first. Formatting may make the USB usable again, but doing it before recovery can overwrite data you still need.
If the files are important, I would avoid scanning the physical USB over and over. A drive that suddenly appears as RAW may have bad sectors or another hardware issue, and repeated reads can put more stress on it.
My preferred approach is to open Disk Drill and make a byte-to-byte backup first. This creates an image containing every readable sector. You can then scan that image instead of continuing to work directly with the original drive.
Once the backup is ready, use Attach Disk Image in Disk Drill, choose the image from the storage device list, and click Search for lost data. Let the Universal Scan finish, even if files start appearing early. Disk Drill may recover data using what remains of the original file system, or switch to file-signature recovery if the file system is too damaged to read.
You do not have to wait until the scan ends to inspect the results. Open Review found items and use the category filters for Pictures, Video, Documents, Archives, and other file types. That is usually faster than going through everything one file at a time.
Preview several important files before recovering them. Check a few photos, documents, and videos to make sure they open correctly. A working preview is generally a good indication that the file contains usable data rather than only a filename or an incomplete fragment.
When you find the files you need, select them and click Recover. Save them to your internal SSD, another external drive, or any other storage device with enough free space. Do not recover anything back onto the damaged USB. Writing new data to it could overwrite files that have not been recovered yet.
Only format the USB after everything important has been copied somewhere safe. At that point, exFAT is a reasonable choice if you need the drive to work with both Windows and macOS. NTFS makes more sense if you mainly use it with Windows.
The safest order is:
stop using the USB → create a byte-to-byte image → scan the image → preview the results → recover files to another drive → format the USB afterward.
I have had better results treating this as a recovery job first and a drive-repair job second. Formatting can wait until the files are safe.
This video also walks through the process:
https://www.youtube.com/watch?v=dSrYeyo6T6o
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Do not run CHKDSK on a USB that shows as RAW. It often cannot repair that state and may make recovery harder, so recover from an image as @redloop23x suggested, or use a professional service if the drive disconnects, clicks, or reports the wrong capacity.
A USB that shows the correct capacity and stays connected is very different from one showing 0 bytes, the wrong size, or constant disconnects. In the first case, scanning an image with Disk Drill or another recovery tool is reasonable. In the second, stop plugging it in repeatedly because software probably cannot fix a failing controller or flash chip. Check its reported size in Disk Management, but do not initialize, format, or create a new volume.
A USB that stopped opening on the same Windows PC is a different case from one that was last used on a Mac, Linux computer, NAS, or another device. Windows may show the format prompt simply because it does not understand that file system. I would rule that out before assuming the drive needs recovery software.
Check Disk Management without changing anything. If the partition is present with the expected capacity, try connecting it to the operating system or device that originally created it. A Mac-formatted or Linux-formatted drive may open normally there. If another computer can read it, copy the important files immediately rather than trying to repair the USB in place.
If it really shows as RAW everywhere, then the imaging advice from @redloop23x makes sense. I agree with @binaryspark2418lab about avoiding CHKDSK in that state, but I would not keep installing tools and running separate scans against the original drive. Pick one recovery method, preferably using an image, and recover to different storage. Every extra write to the USB is a needless risk.
Keep expectations realistic too. A deep scan may recover the contents while losing the original filenames and folder structure, especially if the file system metadata is badly damaged. You might end up sorting hundreds of files named by type or number. Previewing is useful, but large videos and archives can still be incomplete even when their names appear in the results.
Trying another USB port or another computer once is reasonable. Reconnecting it ten times while it drops out, becomes unusually hot, reports 0 bytes, or changes capacity is not. Those symptoms point away from a simple file-system problem and toward hardware trouble, where a professional recovery service is the safer option if the files are genuinely irreplaceable.
Do not click “Quick Format” thinking it is harmless. It is faster than a full format, but it still replaces file-system metadata that recovery tools may need.
There are two different priorities here. If another computer can open the USB normally, copy the irreplaceable files first, starting with small documents and photos. If every computer reports RAW or asks to format, stop trying to browse it and create an image instead.
Keep in mind that an image needs free space equal to the USB’s full capacity, not just the amount of data stored on it. A 128 GB drive generally needs about 128 GB available on another healthy disk. Scan that copy and recover files to separate storage.
If the USB vanishes during reading, changes size, or becomes hot, software recovery is a poor comparison to professional recovery. At that point, repeated attempts may cost you more data than they save.
If this is a cheap no-name flash stick or an old SD-in-adapter, adjust your expectations before you spend an evening on it. Those controllers fail in ugly ways, and the RAW prompt is sometimes the last thing they do before dying completely. The imaging-first advice is solid and I’d follow it, but I think everyone’s skipping the boring first check: look at what actually caused this. If you yanked it mid-copy or lost power, a clean image and scan usually gets most of it back. If it just started showing RAW on its own with no trigger, that’s the pattern I’d worry about.
One correction to the workflow above, imaging a flaky stick can itself be slow and stall on bad sectors, so let the imaging tool skip unreadable areas instead of retrying forever. Disk Drill’s byte-to-byte image is fine for that, just don’t expect a perfect clone off a drive that’s already misbehaving. Grab what reads, scan the copy, move on.
That format button is for making the USB usable again, not for getting your files back. The wording confused me at first because Windows makes formatting sound like the required next step, when it actually creates a new file system.
The image-first advice from @redloop23x is the safer route. After making the image, you can try a free recovery tool such as PhotoRec if you do not want to pay immediately. The downside is that it may recover files with generic names and no original folder structure, so sorting everything can be tedious. Recover the results to another drive, never back to the USB.
If the stick stays connected and reports its normal capacity, software recovery is worth attempting. If it shows 0 bytes, keeps disappearing, or gets hot, stop there. That is more likely a hardware problem than something formatting or recovery software can solve.
If the USB was encrypted with BitLocker or another tool, find the recovery key before running file recovery, since signature scans may only see encrypted data. Otherwise, cancel the format prompt and recover from an image as suggested above, saving everything to a different drive.