Most modern cameras accept up to 128GB or larger, but anything above that might go unsupported. Always check the camera's product page or manual first. One final note: don't go too small.

To maintain compatibility with your digital camera, do not change the default settings for the card's file system or allocation unit size. Click the "Start" button to format the SD card.

New memory cards can hold thousands of photos or hours of video. But before you buy a new card, make sure it will work with your camera.

Memory cards are all over the map -- a wide range of formats, sizes, and speeds. Some cards throw a bunch of numbers at you, while others may only list their capacity. Confusing doesn't begin to ...