“You need to format the disk in drive E: before you can use it.” It appears the moment you plug the drive in, it offers you two buttons, and one of them is the worst thing you could possibly click.
Click Cancel. Every time. Your files are still on that drive.
Windows is not telling you the drive is empty. It is telling you it cannot read the file system header — the small structure at the start of the volume that says “this is NTFS, here is the layout.” Without it, Windows has no idea how to interpret the rest of the drive, so it assumes the drive is unformatted and offers to fix that. Formatting would write a brand new empty header over the top and leave your data stranded with no map.
Why the header goes missing
The file system was mid-update when power was cut. Extremely common on USB sticks and SD cards.
Very recoverableSame problem on an internal or external drive during a write operation.
Very recoverableA handful of failed sectors that happen to sit under the boot sector.
Usually recoverableA resize or conversion that did not finish.
Usually recoverableDeliberately damaged or encrypted headers.
DependsHeader damage as the first visible symptom of a dying disk.
Image it immediatelyThe important thing on that list: nearly all of them damage a tiny structure while leaving hundreds of gigabytes of actual file data completely intact. That is why this situation looks catastrophic and usually is not.
Confirm before you act
Open Disk Management on Windows (Win+X, Disk Management) or Disk Utility on macOS with “Show All Devices” turned on.
If the drive appears with the correct capacity but the file system reads RAW, you have confirmed the diagnosis. RAW does not mean blank — it is Windows’ word for “there is a volume here and I cannot identify its format.” The data is underneath.
If the drive appears as Unallocated, the damage is at the partition table level instead, which is a slightly different repair but an equally good prognosis.
If the drive does not appear at all, this is a hardware problem — see our drive not detected guide.
You will find a great deal of advice suggesting chkdsk /f E: for this. On a RAW volume, chkdsk usually just reports “The type of the file system is RAW. CHKDSK is not available for RAW drives” and does nothing, which is fine. But if it does run, it repairs by discarding structures it cannot reconcile — and on a damaged volume that regularly means files end up as unnamed fragments in a found.000 folder, or gone. Recover your data first. Repair the drive afterwards.
Two ways out, in order of preference
Option one: repair the file system
The best outcome by a distance is to fix the header so the drive simply mounts again with everything on it, in place, correctly named. NTFS keeps a backup boot sector at the end of the volume, and FAT32 keeps a second copy of its allocation table. A tool that finds those can write them back over the damaged originals.
TestDisk does exactly this and it is free. Its Advanced menu offers “Boot” then “Rebuild BS” for NTFS, or copies the backup boot sector over the primary. When this works, you plug the drive in afterwards and everything is simply there. No file-by-file recovery, no filename loss, no need for a second drive to recover onto.
It looks like a 1990s BIOS utility and it is genuinely worth twenty minutes of your time before you spend money.
Option two: recover the files off it
If the file system is too damaged to repair, extract the files instead and rebuild the drive afterwards.
Stellar Data Recovery
Strongest option when the drive itself is sick
| Platforms | Windows, macOS |
|---|---|
| Distributed as | Freemium |
| Free version | Preview free, 1 GB free on Windows |
| Price range | $49.99 – $199 |
| Best for | Clicking, RAW or unreadable drives. |
What we liked
- Handles RAW and corrupted partitions better than most consumer tools.
- Skips and logs bad sectors instead of hammering a dying drive.
- Creates a drive image first, which is the correct order of operations.
- The same company runs a physical cleanroom lab if software fails.
What annoyed us
- Priciest tiers climb quickly once you want the pro features.
- Interface feels more utilitarian than Disk Drill or EaseUS.
Stellar was the strongest performer on our deliberately corrupted RAW test volumes. It reconstructs directory structure from file system remnants more successfully than most, and it images the drive first rather than repeatedly hammering hardware that may already be struggling.
Disk Drill
Best overall recovery rate for regular people
| Platforms | Windows, macOS |
|---|---|
| Distributed as | Freemium |
| Free version | Recover up to 100 MB free |
| Price range | $89 – $149 |
| Best for | Almost everyone. Start here. |
What we liked
- Highest recovery rate of anything we ran through our test drives.
- Rebuilds original file names and folder structure, not just raw blobs.
- Deep RAW photo/video support — Canon CR2/CR3, Nikon NEF, Apple ProRes.
- One licence covers both Windows and macOS.
- Byte-to-byte disk imaging included free, which matters on a failing drive.
What annoyed us
- Cannot repair already-corrupted photos or videos.
- Free tier caps you at 100 MB of actual recovery.
Close behind, and better if the drive is otherwise healthy and you want the highest raw recovery rate. Its imaging is excellent and its preview is the clearest of the group, which matters when you are deciding whether to buy.
PhotoRec / TestDisk
Completely free, open source, genuinely effective
| Platforms | Windows, macOS, Linux |
|---|---|
| Distributed as | Free (open source) |
| Free version | Signature scan only — no file names |
| Price range | Free |
| Best for | Zero budget, and you can tolerate ugly. |
What we liked
- Free forever with no limits, no upsell, no licence key.
- Signature carving is legitimately strong on photos and video.
- TestDisk can rebuild a broken partition table outright.
- Runs on anything, including a Linux live USB.
What annoyed us
- You lose all original file names and folder structure.
- Text-mode interface with no preview.
- No support to call when you get stuck.
PhotoRec does not care that the file system is unreadable — it never reads the file system in the first place. For a RAW drive this is arguably the ideal free tool. You will lose filenames and folders, but you will get the file contents back.
The order to do this in
- Cancel the format prompt. Then keep cancelling it. Windows will ask again every time you plug the drive in.
- Confirm in Disk Management that the volume shows as RAW with the correct capacity.
- Image the drive. This is not optional here. A drive whose header failed may have more failures coming, and you want one clean copy before you start experimenting.
- Try TestDisk on the image. If it rebuilds the boot sector, you are done and everything is intact.
- If that fails, run a recovery scan on the image with Stellar, Disk Drill or PhotoRec.
- Preview before paying. Open several files. If they render, the data survived.
- Recover to a different drive. Then, and only then, format the original and put it back to work — or replace it, if the header damage was a symptom rather than an accident.
Was this a warning sign?
Worth asking. If the RAW error followed an obvious cause — you pulled the stick out mid-copy, the power went — it was an accident and the drive is probably fine after reformatting.
If it appeared out of nowhere on a drive that has been getting slower, or that has thrown errors before, treat it as the first visible symptom of a failing disk. Recover the data, check SMART with CrystalDiskInfo, and do not trust the drive with anything you care about afterwards. Drives rarely fail politely twice.
Questions people actually ask
If I format the drive, can I still get the files back?
After a quick format, usually yes — the data survives and only the index is replaced. But you have made the job harder for no benefit. Cancel the prompt and scan the drive as it is.
What does RAW actually mean?
It is Windows’ label for a volume whose file system it cannot identify. It does not mean empty, erased or unformatted. It means the header describing the format is damaged or missing while the rest of the volume is likely intact.
Can I fix a RAW drive without losing data?
Often, yes. NTFS and FAT32 both keep backup copies of their critical structures. TestDisk can write those back over the damaged originals, after which the drive mounts normally with everything in place. That is the best possible outcome and it is free.
Why does this keep happening to the same drive?
Either you keep removing it without ejecting, or it is failing. If you have been ejecting properly and it is recurring, check the drive’s SMART data and replace it. Repeated file system corruption is a classic pre-failure symptom.
Does the same advice apply to SD cards and USB sticks?
Yes, identically — and this error is more common on them than on hard drives, because they get pulled out mid-write far more often. Write-protect the card if it has a switch, then follow the same steps.
How long will recovery take on a 2 TB RAW drive?
Imaging takes roughly two to four hours over USB 3.0. A deep scan of the image adds another two to four. Budget most of a day and do not interrupt it.
The short version
Cancel the format prompt. RAW means the map is damaged, not that the data is gone.
Image the drive, then try TestDisk free to rebuild the boot sector — if that works, everything comes back exactly as it was. If it does not, Stellar performed best on RAW volumes in our testing and will show you your files before you pay.