thanks very much. I solved part the problem. I tried it whit a new SD-Card. When I use the pin 52 I am able to read the card information whit the program above. But only if I use SPI. Pin 10 don't work at all and Pin 4 a bit. If I work whit Pin 4, he accept the card, but he can't find out, what format she has. This is kind of weird, I think, because Arduino say all three pins should work (http://arduino.cc/en/Reference/SPI). Knows anybody something about this?
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