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+USB Ports
+---------
+
+If you connect multiple keys to the Rpi, they will be listed listed that way:
+
+First: Top left
+Second: Top right
+Third: Bottom left
+Forth: Bottom right
+
+tl;rd: as long as the source key (sda) is connected to the top left port, the destination (sdb) can be connected on any other port.
+