why does my canon camera say card locked

I did some more research on the SD card lock and it seems I spoke to soon. Of course if you solved your problem already then disregard this or read it for future reference. Here's what I found. there is a small switch in the card reader that sense the lock switch position. The lock switch on the card is just a piece of plastic with no influence on the card itself only the reader. I would say test the card in a computer first now and see if ot works. Also an old or worn out lock switch might change position as it is inserted into the reader.

Inspect the card slot with a light and magnifying glass paying strict attention in the reader where the lock switch would be located when inserted. Maybe something had gotten into the reader, perhaps blow it out with compressed air.
SD cards have a tiny little tab on the left side edge (as seen from the front of the card). When this tab is in the LOCK position, a sensor switch in the camera tells the camera that the card should not be written to, i. e. the card is locked. Remove the SD card from the camera. Check the position of the locking tab and make sure it is not in the LOCK position.

Reinsert the card, and try again. If you are positively sure that the locking tab is not in the LOCK position, and the camera continues to tell you the card is locked, the camera's sensor switch might be stuck. Sometimes, the locking tab pops out of its notch and goes missing. If you see the notch where the locking tab should be, but the locking tab itself is absent, you can tape over the notch with a tiny piece of thin adhesive tape. Be careful, if this is not done cleanly or the tape is too thick, the SD card might get stuck in the slot and you'll have difficulty getting it to eject.

Inserting and releasing the card a few times, thereby jogging the sensor switch, may clear the problem. As a last resort, you can give the SD card slot a blast of compressed air from a can. Be careful because the air from the can might cool down the card slot to the point of causing condensation, so wait a while before turning the camera on again. If the problem refuses to clear, have the camera looked at by someone knowledgeable.

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