MultiMediaCard

MultiMediaCard (MMC) is a removable flash-memory card format introduced by SanDisk and Siemens in 1997. It stores data in portable devices and is a predecessor to several later card formats.

Flash memory: Nonvolatile semiconductor memory that stores data in electrically programmable cells. MMC stores data in flash cells rather than requiring continuous power.
Memory card reader: A device or interface that reads data from and writes data to memory cards. A reader supplies the electrical connection and commands needed to access an MMC card.
Siemens: A German technology company that helped introduce the MultiMediaCard format in 1997. Siemens co-developed MMC with SanDisk.
Digital camera: A camera that records images as digital data using an electronic image sensor. Digital cameras used MMC cards to store photographs and other files.
NAND flash memory: A flash-memory architecture that organizes cells into pages and blocks for dense data storage. NAND technology became the dominant storage medium in memory cards, including later MMC variants.
MMC protocol: A command and data-transfer protocol used by MultiMediaCard devices. It defines how hosts identify cards and request transfers.
SanDisk: An American flash-storage company that helped introduce the MultiMediaCard format in 1997. SanDisk co-developed MMC and helped establish it as a removable storage format.
Mobile phone: A portable telephone that communicates over a cellular network. Some phones used MMC variants to expand removable storage.
Memory card: A compact, removable data-storage device used in cameras, phones, and other electronics. MMC is one format within the broader family of memory cards.
Secure Digital: A removable flash-memory card standard derived from MMC, with added security features and a changed physical design. SD retained compatibility with parts of MMC’s protocol while adding a distinct card design and protections.

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