... the market 2GB Micro SD Card SD Card is Secure Digital Card, and it was launched by Panasonic, Toshiba and SanDisk. It was released ... member companies including IBM,Microsoft,Motorola,NEC,Samsung etc. SD Card data transmission and physical specifications evolved from MMC,and ... .7mm thicker holds storage unit with larger capacity. SD card and MMC card are maintaining upward compatibility, that is to say, ...