Hi Alexandros Stefanidis,
About this question, please refer to these post:
FRDM-K64F--FileSystem(FatFs) on microSD through 4bit mode(SDHC)
Re: TWR-K70 board SDHC 4 bit mode
Wish it helps you!
If you still have question, please let me know!
Have a great day,
Jingjing
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