Card Error
Nikon DSLR / Mirrorless Camera
Severity: ModerateWhat Does This Error Mean?
A Nikon card error means the camera cannot read or write to the memory card. The most common fixes are formatting the card in the camera and ensuring the card meets the camera's speed and capacity requirements.
Affected Models
- Nikon D3500
- Nikon D5600
- Nikon D7500
- Nikon D850
- Nikon Z5
- Nikon Z6 II
- Nikon Z7 II
- Nikon Zfc
Common Causes
- Card formatted on a computer (not in-camera)
- Card write-protect switch in the locked position
- Card capacity exceeds camera's maximum supported size
- Card contacts dirty
- Card corrupted due to power loss during writing
- Card inserted incorrectly or not seated fully
How to Fix It
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Check the write-protect switch.
On the left edge of an SD card, a small slider controls write protection. If it is in the down (locked) position, the camera cannot write to the card. Slide it up to unlock.
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Remove and reinsert the card.
Turn the camera off, remove the card, and reinsert firmly until it clicks. Nikon cameras will not register the card if it is not fully and correctly seated.
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Format the card in the camera.
Menu → Setup → Format Memory Card → Yes. Formatting in-camera creates the correct file system and folder structure Nikon expects. This erases all data on the card — back up any photos first.
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Try a different card.
Test with a different SD card to rule out a faulty card. For Nikon Z cameras shooting video, use a V60 or V90 rated card. For RAW burst shooting on high-end DSLRs, use a UHS-II rated card.
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Recover photos from a corrupted card.
If the card shows errors after an unexpected power-off during a shoot, the card may have a corrupted file system rather than physical failure. Use a card recovery tool such as Recuva (free) or PhotoRec to attempt data recovery before formatting.
Frequently Asked Questions
Why does Nikon say 'This card cannot be used'?
This message typically means the card speed class is insufficient for the selected shooting mode, the card capacity is above the camera's supported maximum, or the card has a file system error. Format the card in-camera and ensure you are using an SD card rated at UHS-I Speed Class 3 (U3) or higher for video recording.