microSD is SD in a SanDisk^ "TransFlash" form factor. Commonly used in cell phones, handheld GPS, iPod clones, and expandable USB FLASH memory drives.
About the size of a fingernail: 15 mm x 11 mm x 1 mm or 0.6" x 0.433" x 0.04" - Don't sneeze.
The pins are:
The DAT1-3 lines start as inputs and become I/O after the SET_BUS_WIDTH command.
microSD supports the MMC serial and SD nibble parallel modes
Can be connected to a standard SD card slot via a mechanical adapter:
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<A HREF="http://techref.massmind.org/techref/mem/flash/microsd.htm"> microSD cards</A>
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