"There are several formats of memory card on the market, seeing that the
major digital camera makers, instead of following a single joint standard,
opted for setting up individual standards. The most outstanding ones are
Compact Flash (CF), Memory Stick (MS), MultiMediaCard (MMC), Secure
Digital (SD), SmartMedia (SM) and xD. In this tutorial we will explain in
details the technical differences of each one of the leading memory cards
standards, since they are not compatible among them."