The pinout for normal SD-Card:

Pin 1 = DAT3
Pin 2 = CMD
Pin 3 = GND
Pin 4 = +3,3V
Pin 5 = CLK
Pin 6 = GND
Pin 7 = DAT0
Pin 8 = DAT1
Pin 9 = DAT2

but for µSD-Card:

Pin 1 = DAT2
Pin 2 = DAT3
Pin 3 = CMD
Pin 4 = +3,3V
Pin 5 = CLK
Pin 6 = GND
Pin 7 = DAT0
Pin 8 = DAT1 
Pin 9 = used for Switch