Protection and reliability with Kingston's Secure Digital memory cards Kingston's standard Secure DigitalTM (SD) memory cards combine massive storage capacity, blazing data transfer rates and ironclad security in a memory card no bigger than a postage stamp. With an excellent price-to-performance value, Kingston's SD cards are ideal expansion option for the smallest of devices including MP3 players, digital cameras, PDAs, smartphones and more. For added reliability and durability, our solid-state SD memory cards are built of nonvolatile memory components and have no moving parts to wear out or break. Quickly and easily download and transfer digital files between various digital devices, a computer and the Internet. An SD memory card reader makes it easy to upload files from an SD memory card to a computer.