Forked so that I could up the speed to 8MHz, which seems to work just fine on my LPC1768, and with any of the half dozen or so micro-sd cards I tested it on.

Dependencies:   FATFileSystem

Fork of SDFileSystem by Mbed

Revision:
4:ef8db874908b
Parent:
3:7b35d1709458
--- a/SDFileSystem.cpp	Mon Mar 17 14:34:01 2014 +0000
+++ b/SDFileSystem.cpp	Mon Jan 26 04:27:32 2015 +0000
@@ -207,7 +207,7 @@
         return 1;
     }
     
-    _spi.frequency(1000000); // Set to 1MHz for data transfer
+    _spi.frequency(8000000); // Set to 8MHz for data transfer
     return 0;
 }