SPI/SDIO - MicroSD Card Module

 

ESP32 Handling Files with a MicroSD Card Module

Source: https://randomnerdtutorials.com/esp32-microsd-card-arduino/

There are two different libraries for the ESP32 (included in the Arduino core for the ESP32): the SD library and the SDD_MMC.h library.

If you use the SD library, you’re using the SPI controller. If you use the SDD_MMC library you’re using the ESP32 SD/SDIO/MMC controller. You can learn more about the ESP32 SD/SDIO/MMC driver.