Digital Sound Recorder Using DAC with the tinyAVR® 1-series
AVR SD Card Initialization Tutorial Part 1
The different between SD card and MMC is initialization process. The communication protocol of SD card includes SD bus and SPI. - Bulk Memory Card Storage
SD Card Interface Overview
SD Memory Card Interface Using SPI
Kingston Technology
SD/MMC | TEMLIB
Interfacing with a Secure Digital (SD) card - Northwestern Mechatronics Wiki