Likely causes
- Card format is unsupported
- Counterfeit or worn card
- Card exceeds supported capacity
- Firmware bug
- Card inserted incorrectly
Quick checks
- Confirm the maximum supported capacity
- Use a reputable card rated for continuous recording
- Format the card in the camera or official app
- Check the card on a computer
- Update camera firmware
Step-by-step fix
Power off the camera
Remove and reinsert the card correctly
Let the camera or app format the card
Test recording locally
Replace the card if format or write operations still fail