Hi Walter Zimmer,
MK66 just have one SDHC module, so you just can add one SD card.
If you want to add the other SD card in the K66, you need to use the SPI interface.
From my viewpoint, you can't use two SD card in parallel with the same SDHC interface.
You can try the sd card on your side, if each SD card works alone, but two sd cards can't work together, it will also demonstrate that theory.
About the SD card code for K66, you can refer to the SDK code, which can be downloaded from this link:
Welcome | MCUXpresso SDK Builder
Select the FRDM-K66 board, then generate the code, and download it.
You can find the SD code from this folder:
SDK_2.5.0_FRDM-K66F\boards\frdmk66f\driver_examples\sdcard
Wish it helps you!
If you still have question about it, please kindly let me know.
Have a great day,
Kerry
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