If your pen-drive is not showing data and you know that there is some data in it then below steps can help you in displaying data in pen-drive.

  1. Step 1: Open command prompt - Start > Run > type "cmd" and enter
  2. Step 2: Hit below command. Here I am assuming that your pen-drive is H drive 
 attrib -h -r -s /s /d h:\*.*

This will solve your problem. :)