Chapter
17
SD/MMC Drivers
SD (Secure Digital) cards and MMCs (MultiMedia Cards) are portable, low-cost media often
used for storage in consumer devices. Six variants, as shown in Table 17-1, are widely
available to electronic retail outlets, all supported by SD/MMC driver. The MMCplus and SD
or SDHC are offered in compatible large card formats. Adapters are offered for the
remaining devices so that these can fit in standard SD/MMC card slots.
Two further products incorporating SD/MMC technology are emerging. First, some cards
now integrate both USB and SD/MMC connectivity, for increased ease-of-access in both PCs
and embedded devices. The second are embedded MMC (trademarked eMMC), fixed
flash-based media addressed like MMC cards.
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