Compatibility:
RSMMC ("Reduced Size MMC") is a smaller-sized version of the standard MMC ("MultiMediaCard"). MMC Mobile cards are an improved (faster) version of RSMMC, and are the same size and shape.

MMC Mobile cards can be used with no problem in devices that require RSMMC cards. However, to get the benefit of the improved performance, your device has to include MMC support (you can sometimes upgrade the firmware to do this).

Devices that are designed to take Mobile MMC cards will also accept RSMMC cards.