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Multimedia Card

Multimedia Card

The Multimedia Card (MMC) is a flash memory memory card standard. Unveiled in 1997 by Siemens and SanDisk, it is based on Toshiba's NAND-based flash memory, and is therefore much smaller than earlier systems based on Intel NOR-based memory such as Compact Flash. MMC is about the size of a postage stamp: 24mm x 32mm x 1.5mm. MMC originally used a 1-bit serial interface, but newer versions of the specification allow transfers of 4 or sometimes even 8 bits at a time. They have been more or less superseded by SD cards, but still see significant use because MMC cards can be used in any device which supports SD cards.

Typically, an MMC card is used as storage media for a portable device, in a form that can easily be removed for access by a PC.
MMC cards are currently available in sizes up to and including 2 GB, and are used in almost every context in which memory cards are used, like cell phones, mp3 players, digital cameras, and PDAs. Since the introduction of Secure Digital few companies build MMC slots into their devices, but the slightly-thinner, pin-compatible MMC cards can be used in any device that supports SD cards. A handful of companies, most notably Nokia, still support MMC exclusively, however.

Related Topics:
SD Card