Yes, I found this post very helpful: https://community.st.com/t5/stm32cubemx-mcus/stm32l4-sd-stm32cubemx-v5-0-0-sd-clock-speed-during-call-to/td-p/371550The problem is that some (many?) SD cards don't like being switched to 4-bit mode while running h...

I'm having the same problem on an STM32F411CEU6. Looking at the SD/MMC protocol, I have a hard time believing 0 is a valid value for the SCR register.@aserbes, I'm not sure how you got to 300 - 255 is the maximum value for the clock divider.I used 25...