The SD Card is ideally suited for portable digital devices such as audio players, digital still cameras, digital video camcorders, handheld PCs and cell phones. The SD Card is 32 millimetres long, 24 mm wide and 2.1 mm thick. The card is slightly thicker than a MultiMediaCard allowing it to contain more memory for higher data capacity while maintaining the smallest area profile in the market. 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.