Without an SD card to record your images, your digital camera will end up feeling like a pricey paperweight. Because an SD card serves as the memory center for your camera, its performance and reliability, in addition to a reasonable price, are key to finding one you can count on. Through our research and testing, we’ve found that the 64 GB SanDisk Extreme Pro is fast enough for a 4K video enthusiast, speedy enough for an impatient downloader, and reliable enough for anyone to use for years to come.