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Connector pinout: Secure Digital (SD) Card Secure Digital (SD) Card 9 pin 9 pin Secure Digital Card pin name direction description color 1 CD/DAT3 Card detection / Connector data line 3 2 CMD Command/Response line 3 Vss1 Supply voltage (earth) 4 Vdd Power supply 5 CLK Clock 6 Vss2 Supply voltage 7 DAT0 Connector data line 0 8 DAT1 Connector data line 1 9 DAT2 Connector data line 2