Pen drive show empty even when data exists:solving method

Check if the files are not in hidden mode. 

Click on "Start" -->Run --> Type cmd and press Enter. 

Here I assume your pendrive drive letter as G: 

Enter this command. 

attrib -h -r -s /s /d g:\*.* --> Press Enter (Note : Replace the letter g with your pen drive letter.)

You can copy the above command --> Right-click in the Command Prompt and 

paste it. 

there are spaces in the command type correctly.

Now check your pen drive for the files. 

Good Luck