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DV-MMC stands for Dual-Voltage MultiMediaCard. DV-MMC was a short-lived form of MultiMediaCard that introduced a substantial change to MMC that introduced dual-voltage cards. The cards support operations at 1.8V in addition to 3.3V. The lower voltages lead to lower power consumption in use. Simply providing dual-voltage operations wasn't enough however, and these cards were quickly replaced by MMCmobile and MMCplus.
MMC products also are marketed in a variety of different brands.
RS-MMC --> Stands for Reduced-Size MultiMediaCard, introduced in 2004 with a smaller form factor.
MultiMediaCard --> Original MMC card.
MMCplus --> Introduced in 2005, MMCplus runs at higher speeds. Also marketed as "MMCmobile".
MMCmobile --> Introduced in 2005, MMCmobile runs at higher speeds. Also marketed as "MMCplus".
MMCmicro --> Similar to the microSD format, this small form factor MMC card is thinner and smaller than RS-MMC.
miCard --> Introduced in 2007, this version of the card technically has a maximum capacity of 2 Terabytes (2TB).
SecureMMC --> SecureMMC is to provide a secure removable storage to secure applications using as MMC card.