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What is the difference between multimediacards and secure digital cards? The recent proliferation of solid-state flash cards such as multimediacards(mmc)and securedigital(sd)have given way to many assumptions, sometimes in error. This in turn warrants an analysis that will help guide and highlight key MMC and SD features and benefits that will determine which solution is best for you.Size: Looking at both cards from the front, with the exception of the write protection switch on the SD cards, they look identical(bothare 24mm x 32mm). This is most likely of the reasons there is often confusion between the two standards. Thickness wise, however, there is a difference. MMC cards are 1.4mm whereas SD cards are 2.1mm. Besides the thickness, other physical differences include the pin configuration(onthe back) and again the write protection switch on the SD card.Compatibility: Because MMC cards are slightly thinner than SD cards, generally you can say that MMC cards are compatible with SD com