Using SD card with another SPI device - Programming Questions - Arduino Forum
Amazon.com: Stemedu 2PCS Micro SD Card Module TF Card Memory Storage Adapter Reader Board SPI Interface with Integrated Circuit Breakout for Arduino for Raspberry Pi : Electronics
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
How to Use MMC/SDC
Amazon.com: Wishiot 5pcs SD Card Module Mini TF Card Reader Sensor with SPI Interface Onboard Level Conversion +1pc 40P Male to Female Dupont Cable for Arduino Mega2560 Nano ESP8266 ESP32 Wemos D1