It is bit difficult to extract file if you insert memory card and pendrive in your computer.
Many time your driver get install in computer and option of DATA of Pendrive and Memory Card show in computer. But if you will see the DATA and click on it you will see blank (means no DATA on it ) or it will ask you to format the Pendrive and Memory Card DATA. So it is very hard for you in both the stage but this is not so big problem if you will see video in my this Post.
Explaining one more time that if you see Pendrive and Memory Card inserted and it show that from 8 GB Pendrive 3 GB is used but when you click it show blank but dont worry because if one file got corrupted but other remained uncorrupted then the pendrive get auto lock by the corrupted file and you unable to see the pendrive and memory card file DATA .So in this stage you have to forcely open the pendrive and memory card .This can be solved by force opening it.
The force opening can be done by the Power ISO software which will not only forcely open the pendrive and memory card data but aslo not harm any of it content
SEE THE VIDEO OF HOW TO EXTRACT THE DATA FROM EXTERNAL DRIVER
DOWNLOAD POWERISO SOFTWARE