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A camera or computer may ask to format an SD card when it cannot understand the file system. Formatting may make the card usable again, but it is the wrong first step when the photos still matter.
Do this immediately
- Choose Cancel when asked to format.
- Stop taking new photos or videos.
- Remove the card and slide the physical lock switch into the locked position if it has one.
- Use a reliable card reader connected directly to a computer.
- Recover files to the computer or another drive, never to the card.
Why the format message appears
The card may have been removed during a write, the camera battery may have failed, the file system may be corrupted or the flash memory may be wearing out. A bad reader can produce the same symptom, so test one known-good reader before assuming the card itself is damaged.
Quick scan or deep scan?
If the card still has a recognizable partition, try a quick scan first. If it appears as RAW, unallocated or newly formatted, use a deep scan that searches for JPEG, RAW and video signatures. Signature recovery may lose filenames and folder structure.
Preview the important photos first
Check full-size previews before buying. A thumbnail may survive even when the complete image is damaged.
What not to do
- Do not run CHKDSK before recovery.
- Do not initialize or repartition the card.
- Do not keep using a card that repeatedly corrupts files.
- Do not trust the card for new work after a serious failure.
After the files are safe
Verify copies on at least two devices. Then format the card in the camera—not the computer—and test it with non-important photos. If errors return, replace the card. Memory cards are inexpensive compared with a second recovery attempt.
Scan before you let Windows format anything
The format prompt means the file system is unreadable, not that the photos are gone. Pull the card out, scan it from a reader, and only format once you have the images off. MiniTool reads cards in that state and previews thumbnails before you pay.