MBRBlockDevice FAT filesystem on a SD card

Revision:
0:a48b7099a59c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sd-driver.lib	Fri Oct 13 16:56:41 2017 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/sd-driver/#ae7e7440054c9447f8255bdccbcc523b3f6dffe4