Compare the merits of MMC and SD Memory cards

MMC - MultimediaCard and SD - SecureDigital are two alternative memory card standards.

Whilst they are closely related, they are distinct standards in their own right and managed by separate corporations and associations.

MMC cards are compatible with both MMC slot devices & SD slot devices. (e.g. Nokia, Siemens, Samsung, Sharp, Motorola phones and SD slot cameras))

SD cards are only compatible with SD slot devices. (which excludes Nokia and Siemens phones and other MMC devices)

This makes a like-for-like comparison between MMC and SD fairly straightforward, as one standard has a much wider range of devices with which it is compatible.

However, it is not quite that simple because SD cards do have some additional functions in the hardware specification, including a write-lock toggle, and some wiring for enabling digital rights management on the card.

In the vast majority of cases, i would say the broader compatibility across both SD and MMC is the more useful feature to have, especially as digital rights management is a feature of most use to owners of copyrighted material who want to protect it.

hope this helps