Also make sure that the SD Card is not being assian a driver letter already in use by your laptop. If you go to "Control Panel" Administrator Tools" then inside there check "Computer Management" there should be Disk Management check and see what Drive letter your SD Card is being assign. If it is assign a drive letter that is already in use it will not show up to just right click on your SD Card from here and change the Drive Letter to a Drive letter not in use like X or Z..
"The object of war is not to die for your country but to make the other bastard die for his."
- General George Patton (1885-1945)