Multi Media Card
From open-encyclopedia.com - the free encyclopedia.
A Multi Media Card (MMC) is a solid state disk or flash memory data storage device. 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.
MMC is a popular storage medium for very small electronic devices, like mobile phones, PDAs and MP3 players. It comes in 16MB, 32MB, 64MB, 128MB, 256MB, 512MB, and 1GB sizes as of 2004. In addition, a 2GB card has been announced.
Toshiba has responded to complaints from copyright holders by including additional hardware to perform on-system encryption, thus making it impossible to directly copy songs from one MMC to another. The resulting system, Secure Digital Card, has since emerged as a competitor to the MMC.
See also:
Compact Flash, XD-Picture Card, Secure Digital, Memory Stick
External links
de:Multimedia Card ja:マルチメディアカード
