My SD card suddenly shows as corrupted after I moved photos and videos from my camera. I’m afraid I’ll lose important files if I try to repair it first, but I also don’t know if recovery software will work unless the card is fixed. I need help figuring out the safest order to recover data from a corrupted SD card without making things worse.
I hate this failure mode. You finish a shoot, sit down to copy files, plug the SD card in, and your computer throws up a cheerful little message telling you to format it. I’ve had it happen after family footage, drone clips, and one batch of work photos I did not want to reshoot. The first few minutes matter.
If you see something like “You need to format the disk in drive X:” or “SD card is corrupted, tap to fix,” stop there. Don’t hit Format. Don’t let your phone “repair” it either. I did this once, years ago, because the prompt made it sound harmless. It was not harmless. The card’s file map got rewritten, and pulling files afterward was worse.
The order matters.
Recover your files first
Trying to repair the card before saving your data is where people get burned. Repair tools change the file system. Sometimes they help. Sometimes they overwrite the exact bits you were hoping to recover.
My rule is simple: copy out what still exists, then mess with repairs.
For recovery, I’ve had the best luck with Disk Drill. The part I care about most is the byte-to-byte backup option. If a card is half-dead, repeated scans make it worse. I’ve seen a card mount once, then vanish on the next read. Not fun.
So I clone the card first. Sector by sector. Save the image to your computer, put the physical card aside, then scan the image file instead of hammering the card again and again. If the hardware is failing, this gives you a better shot. After scanning, preview the recovered files and save them onto a different drive. Not back onto the same SD card. I know thsi sounds obvious, but people do it.
Then try to fix the card
Only after your files are somewhere safe, I’d move to repair attempts. This is the sequence I follow.
1. Run CHKDSK on Windows
This is the first thing I try for file system damage.
Open Start, type cmd, right-click Command Prompt, run it as administrator. Then enter:
chkdsk X: /r
Replace X with the card’s drive letter.
The /r switch tells Windows to check for bad sectors and try to recover readable data from damaged areas. On a big card, this takes a while. Let it finish. If the issue is logical corruption and not a dying controller, sometimes this is enough to get the card readable again.
2. Use TestDisk if the partition is gone
If the card shows as unallocated, or the partition vanished, CHKDSK often won’t help much. This is where TestDisk earns its keep.
It looks old. No pretty interface. Feels like software from another era. Still works.
TestDisk is good at finding missing partitions and repairing busted partition tables. I’ve used it on cards Windows refused to show properly in File Explorer. If it detects the old partition layout, it lets you write it back. When it works, it feels almost suspiciously easy.
You do need to read each screen and not click through on autopilot. One wrong write to the wrong disk and your day gets worse fast.
3. Full format the card if recovery is done and repairs failed
If the card is empty now, your files are backed up elsewhere, and the earlier steps didn’t get it stable, then format it.
In File Explorer, right-click the card and pick Format. I’d skip Quick Format and do the full one. It takes longer, but it checks the card more thoroughly. For many newer SD cards, exFAT is the better file system, especially if you store large video files. FAT32 has file size limits and gets old fast once you deal with 4K footage.
If a full format fails, or the card keeps corrupting after format, I’d retire it. No debate.
A card that corrupts once is on thin ice
I don’t trust a card after this. Even if you get it working again, I’d stop using it for anything important. Use it for throwaway transfers if you want, or toss it. SD cards wear out. Cheap ones fail sooner. Name-brand cards fail too, only with fewer surprises if you buy from a legit seller.
Also, eject the card properly before removing it. A lot of corruption starts with yanking it out while writes are still pending. Same goes for cameras losing power mid-write. If you’re recording video and the battery dies right as the file closes, weird stuff happens.
Short version:
1. Don’t format when prompted.
2. Recover files first.
3. Clone a shaky card before scanning it.
4. Try CHKDSK.
5. Try TestDisk for missing partitions.
6. Full format only after your data is safe.
7. Stop trusting the card afterward.
That order saved me more than once.
3 Likes
Recover first. Repair later.
If the card still shows up in Disk Management or your camera, stop writing to it. No new photos. No format. No ‘fix errors’ prompt. Every write lowers your odds.
I agree with @mikeappsreviewer on the order, but I would skip CHKDSK until after recovery. CHKDSK is fine for a throwaway card. For photos and video, it sometimes turns a messy file system into a different messy file system. I’ve seen it replace folders with FILE0000.CHK junk. That sucks if you need the original names and structure.
What I’d do:
- Put the SD card in a decent card reader, not the camera over USB.
- Check if the card shows the right size in Disk Management.
- If yes, make an image first, then scan the image.
- Recover files to your PC or another drive, never back to the SD card.
- Only after that, test or format the card.
Disk Drill is a solid pick for this because it handles photo and video recovery well and it’s easy to preview files before saving them. That matters. If your clips preview, your odds are decent. If you want a quick look at how Disk Drill recovery works, watch this: see how Disk Drill recovers files from an SD card
One more thing people miss. If the card reads as 0 bytes, asks for format on every device, or disconnects mid-read, this leans more toward hardware failure than file system damage. In thta case, fewer read attempts are better.
If recovery works, retire the card. SD cards are cheap. Lost footage is not.
Recover first, repair second. That part I agree with from @mikeappsreviewer and @sognonotturno. Where I differ a bit is this: if the card is still readable enough to show folders, don’t jump straight into “repair tools” at all. Just manually copy whatever still opens before doing anything fancy. Sometimes people overcomplicate it and burn time while the card gets worse.
If normal copying fails, then use recovery software. Disk Drill is a solid choice for corrupted SD card recovery because it can pull photos and videos even when the file system is borked. Save recovered files to your computer or another drive, not the SD card. Obvious, but yeah, ppl still do that.
I would avoid CHKDSK until after your files are safe. It can help, sure, but it can also “fix” things in a way that helps Windows more than it helps you.
Also, test the card in a different reader first. Bad card readers cause fake “corruption” more often than you’d think. Seen it more than once.
If you want a clear walkthrough, this step-by-step guide to fix a corrupted SD card and recover lost photos/videos covers the basic flow.
If the card keeps disconnecting, shows 0 bytes, or gets hot, stop messing with it. That’s not “repair first” territory. That’s “get data off now if possble, then retire the card” territory.
Recover first, but I’d add one nuance to what @sognonotturno, @chasseurdetoiles, and @mikeappsreviewer said: before any scan or repair, try a plain read-only copy of whatever still opens. If the DCIM folder is visible and some files copy normally, grab those first. Recovery tools are for the stuff normal copying can’t reach.
What I would not do first is let Windows “repair” the card, mount it in the camera again, or shoot more on it. Cameras sometimes write little housekeeping files, and even that can make recovery uglier.
My order would be:
- Test the card in another reader or another PC.
- If files are visible, manually copy readable ones.
- If not, recover from the card or, better, from an image of it.
- Save everything somewhere else.
- Only then decide whether to repair or just replace the card.
On repair, I’m actually a bit harsher than the others: if this card glitched once during a photo/video workflow, I usually don’t bother “trust-repairing” it for future use. Maybe test it later, sure, but for important shoots I’d retire it.
About Disk Drill specifically:
Pros:
- easy to use
- good preview support for photos/videos
- can recover from damaged file systems
- imaging feature is useful on unstable cards
Cons:
- not the cheapest option
- deep scans can take a while
- recovery quality still depends on how damaged the card is
So yes, Disk Drill is a reasonable pick if manual copying fails. Just don’t confuse recovery with fixing the card. Different jobs.