why does my camera say memory card locked
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. FIX 3A: If file corruptions are occurring occassionally or intermittently (such as for every few files or movies taken, the camera states "file unrecognized" or something similar), take a close look at your card to determine its "Class", or in other words its write speed.
Written on the face of the card should be the word Class with a number, or a number circled with a capital "C". See the above photo for an example of a Class 6 card (on the left), with an older/slower unmarked card on the right. If neither "Class" or "C" is written, the card is likely Class 2 or lower. Today's newer cameras take very high-resolution pictures, AND high-definition videos. File sizes can be very large. Some of the older SD cards just cannot keep up with the write speed required to save these files before you're ready to take another picture. As a result, some of your files can become corrupted if you're using older cards with newer cameras.
The fix in this case is to purchase a higher speed card for your newer high-performance camera (recommend Class 6 or better). Or you can also wait a few seconds between shots/videos before switching modes or taking another picture (to ensure the write is completed), but that can get to be annoying after a while. FIX 3B: Again, if file corruptions occur intermittently, AND you use a card reader, do you remove the card properly from the reader? When ejecting a memory card from its reader, recommend that you always select the "Safely Remove Hardware and Eject Media". This selection is located in the bar in the lower right-hand corner of your computer screen (if using a PC).
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