Editing MultiMediaCard (section)

=== MMCplus and MMCmobile ===
[[File:MMCplus and MMCmobile logo (recreated).png|thumb|Recreations of the MMCplus and MMCmobile logos]]

The version 4.x of the MMC standard, introduced in 2005, introduced two significant changes to compete against SD cards: (1) the ability to run at higher speeds (26&nbsp;MHz and 52&nbsp;MHz) than the original MMC (20&nbsp;MHz) or SD (25&nbsp;MHz, 50&nbsp;MHz), and (2) a four- or eight-bit-wide [[Bus (computing)|data bus]].

Version 4.x full-size cards and reduced-size cards can be marketed as '''MMCplus''' and '''MMCmobile''', respectively.

Version 4.x cards are fully backward compatible with existing readers but require updated hardware and software to use their new capabilities. Even though the four-bit-wide bus and high-speed modes of operation are deliberately electrically compatible with SD, the initialization protocol is different, so firmware and software updates are required to use these features in an SD reader.