#define's modified for high speed cards

-//#define SD_1_8V_SUPPORT
+#define SD_1_8V_SUPPORT
-#define SD_CLOCK_ID         400000
-#define SD_CLOCK_NORMAL     25000000
+#define SD_CLOCK_ID         50000000 //400000
+#define SD_CLOCK_NORMAL     50000000 //25000000