The Secure Digital Memory Card (SDC below) is the de facto standard memory card for mobile equipments. The SDC was developped as upper-compatible to Multi Media Card (MMC below). SDC compleant equipments can also use MMCs in most case. There are also reduced size versions, such as RS-MMC, miniSD and microSD, with the same function. The MMC/SDC has a microcontroller in it. The flash memory controls