I just went through many steps to remove the Smart HDD virus from my computer. I ran the above referenced program to unhide all the programs etc that the virus hid on me. The program ran great and for the most part was successful. Initially when I ran the program I did not have my external hard drive plugged in. When I plugged it in I noticed that all the folders on my external are also hidden. I reran the above referenced program but it did not unhide anything on my external hard drive. Does UnhideNonSystemFiles work on external hard drives?