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MultiMedia Card (MMC) Memory   ![MultiMedia Card (MMC) Memory]()
MMC is about the size of a postage stamp: 24 mm x 32 mm x 1.4 mm. It is slightly thinner than an SD Card and can be used in most the same applications. MMC uses a 1-bit serial interface, but the newer MMC plus allows transfers of 4 or sometimes even 8 bits at a time. The slightly thinner, pin-compatible MMC cards can be used in almost any device that supports SD cards if the software/firmware on the devices support them.
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