Before getting into the details, some background on each card may be appropriate. The letters ‘MMC’ stand for MultiMedia Card, which is a format that was developed jointly by SanDisk and Siemens in 1997. The letters ‘SD’ stand for Secure Digital, and this format is an improvement on the original MMC design, and was developed jointly by SanDisk, Matushita Electronics (better known as Panasonic) and Toshiba.
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