Symptoms
- Camera or phone says 'no card' or 'card error'
- Computer doesn't show the card when inserted into a reader
- Card works in one device but not another
- Card was recently dropped, gotten wet, or removed while in use
Likely causes
- CommonDirty or misaligned contacts on the card or readerA gentle wipe of the gold contacts often restores the connection.
- CommonCard reader or slot itself has failedTesting with a different card isolates the reader as the cause.
- CommonPhysical lock switch on the SD card set to lockedThis makes the card read-only or unreadable in some devices.
- PossibleCorrupted file system on the cardImproper removal is a frequent cause.
- PossiblePhysically damaged card from bending or water exposureVisible cracks or corrosion usually mean the card is done.
What to do
- Check the small lock switch on the side of the SD card and make sure it isn't set to 'locked'.
- Gently wipe the gold contacts on the card with a dry, lint-free cloth.
- Try the card in a different reader or device to see if the reader is actually the problem.
- Try a different SD card in the same reader to confirm whether the reader works at all.
- If the card is seen but won't open, use file recovery software before formatting it.
- If the card isn't detected anywhere and looks physically damaged, it likely needs professional recovery or replacement.
Tools and parts
- Different card reader if available
When to call a pro
If the SD card has irreplaceable photos and isn't recognized anywhere, stop using it and send it to a data recovery service.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.