Although more and more digital cameras include internal memory, nearly all photographers rely on memory cards to store their photos. Memory cards, which typically are a little larger than a postage stamp, can store hundreds or thousands of photos. Consequently, any problem with the memory card can be a disaster ... no one wants to lose all of their photos. Use these tips to troubleshoot your SD and SDHC memory card problems.
- Computer won’t read the card. Make sure that your computer supports the size and type of memory card you’re using. For example, some older computers can only read SD cards that are less than 2 GB in size. However, many SDHC cards are 4 GB or larger in size. You might be able to upgrade your computer to SDHC compliance with a firmware upgrade; check with your computer’s manufacturer.
- Card is “write protected” error message. SD and SDHC cards contain “lock” switches on the left side of the card (as viewed from the front). If the switch is in the lower/bottom position, the card is locked and write protected, meaning no new data can be written to the card. Slide the switch upward to “unlock” the card.
- One of my memory cards is running slower than the others. Each memory card has a speed rating and a class rating. The speed rating refers to the maximum transfer speed for data, while the class rating refers to the minimum transfer speed. Check your cards and their ratings, and you’ll probably find they have different speed ratings or class ratings.
- Should I worry about using a slower, older memory card? Most of the time for general photography, a slower, older memory card will not cause any problems. If you're shooting HD video or using a continuous-shot mode, however, a slower memory card may be unable to record the data quickly enough, causing video to be cut off or photos to be lost. Try to use a fast memory card for HD video.
- How do I recover deleted or missing files? If the memory card is operating OK, but you’re unable to find or open certain photo files, you can use commercial software to try to recover the photos, or you can take the SD memory card to a computer or camera repair center, which may be able to recover the photos. If your computer or camera cannot read the card, a repair center is your only option.
- Should I format my SD memory card when asked? Deciding whether to format requires a little thought. If you know the card contains photos, you will not want to format it, because formatting erases all data from the memory card. If you receive this message on a memory card you’ve used previously and on which you’ve stored photos, the card or camera could be malfunctioning. It’s also possible that the SD memory card may have been formatted in a different camera, and your camera cannot read it. Otherwise, if the memory card is new and contains no photos, it is OK to format the memory card with no worries.