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SD card, also called SD memory card, is a new generation storage device based on semiconductor flash memory. It is widely used in portable devices, such as digital cameras, personal digital assistants (PDA) and multimedia players, because of its excellent characteristics such as small size, high data transmission speed and hot plug.
SD card is mainly composed of four parts: external pin, internal register, interface controller and internal storage medium. This interface not only keeps 7 pins of MMC card, but also adds 2 pins on both sides as data lines.