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MCB2300 and SD-Card/MCI trouble

Hi,

I wanted to test the SD-card example from keil using the native MCI interface with an SD card.
It detects well an Formatted SDcard inserted but asks me forever to format the card and then , that the format failed...
When a took a look into the source, it seems
mci_init() return well (__TRUE value),
but when I did an mci_read_sect in order to read the sector 0, it failed.
I really didn't find what's wrong...

Best Regards