The HB28E016BP2 and HB28D032BP2 are Hitachi Mobile Embedded Flashes with MultiMediaCardTM interface, which are highly integrated flash memories with serial and random access capability. It is accessible via a dedicated serial interface optimized for fast and reliable data transmission. This interface allows several cards to be stacked by through connecting their peripheral contacts. These Hitachi Mobile Embedded Flashes are fully compatible to a new consumer standard, called the MultiMediaCard system standard defined in the MultiMediaCard system specification [1], except the physical outline and the pin assignment. The MultiMediaCard system is a new mass-storage system based on innovations in semiconductor technology. It has been developed to provide an inexpensive, mechanically robust storage medium in card form for multimedia consumer applications. These Hitachi Mobile Embedded Flashes allow the design of inexpensive players and drives without moving parts. A low power consumption and a wide supply voltage range favors mobile, battery-powered applications such as audio players, organizers, palmtops, electronic books, encyclopedia and dictionaries. Using very effective data compression schemes such as MPEG, these Hitachi Mobile Embedded Flashes will deliver enough capacity for all kinds of multimedia data: software/programs, text, music, speech, images, video etc. Note: MultiMediaCardTM is a trademark of Infineon Technologies AG.