Lost files

Okay heres how it gose, my computer got a bug on it so I placed a few files and folders on this passport thinking that it was like a compter harddrive, well after I reformated my computer redownload the program for this passport I find that a few of my folders are missing everything else is there just not the folders. Now when I moved them in they were in hidden mode I think but I selected all the files and took them out of hidden mode.

Please someone tell me that they are there and what is this RMA# and model number is on the support line and where it can be found on this device

Thanks

Oh and I have passport essential if that makes a difference in help