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Posts: 3,841 | Thanked: 1,078 times | Joined on Nov 2006
No, SD is basically a superset of MMC. SD has 4 data bit contacts while (old) MMC has 1, but SD interfaces can talk in 1-bit mode too. Newer MMC (MMC Plus) again have more contacts than SD, but all these interfaces can still interchange the cards. I believe the Reduced Size versions of MMC are just that, reduced size, but otherwise the same as MMC (sometimes there are reduced voltages as well, but interfaces can still work with all of them if made that way).
Look no further than the N800, which (with adapter, this is just for handling the different physical sizes) can handle the full range of SD/MMC/RS-MMC/mini-SD/micro-SD/MMC Plus.
-- Metalayer-crawler delenda est.
-- Current state: Fed up with everything MeeGo.