The Secure Digital (SD) Memory Card is a flash memory storage device designed to meet the security, capacity, performance and environmental requirements inherent in emerging audio and video consumer electronics devices. They offer an incredible combination of high storage capacity, fast data transfer, great flexibility and excellent security; All in an incredibly small size. Features include cryptographic security for protection of copyrighted data, an improvement in the data transfer rate and a userselectable write protect switch. The SD Card can be used in a variety of digital products; Digital music players, cellular phones, handheld PCs (HPCs), digital cameras, digital video camcorders, smart phones, car navigation systems and electronic books. Host systems designed for the SD Card will allow reading and writing of existing MultiMediaCards thus ensuring that existing user data can be easily migrated to, and used in, next generation systems.