Secure Digital Card Multimedia Card Compatibility
Other versions of this page are also available for the following:
.gif "A hyphen indicates that the information in this topic is not relevant for this platform, or that the platform does not support the API that is listed.")
.gif "A checkmark indicates that the information in this topic is relevant for this platform, and that any API listed is also supported on this platform.")
8/28/2008
The Secure Digital (SD) electrical interface and protocol format are compatible with the multimedia card (MMC) specification, including physical form factor. The first 7 pins of an SD slot are physically arranged in the same manner as an MMC slot. This allows an SD-capable device to host MMC cards in the same slot using the same hardware. A common slot connector can be used that can supports both card types.
At a protocol level, certain SD commands are not supported on MMC devices. An SD memory-aware host can determine whether the device it controls is an MMC or SD Card.
MMC functionality is supported by the Windows Embedded CE Secure Digital I/O (SDIO) host controller.
See Also
Concepts
Secure Digital Card Host Controller Driver
Secure Digital Card Driver Development Concepts