The only device i plugged it in other then my windows is system is my LG55C7 TV.
So you plugged the hard drive into the LG TV ?
Can you mount the hard drive in any LE Box ?
I was lucky it mounted on my TX7.
If you can use file manager to delete any strange files you see.
I'd say the TV may have inserted a file for its reading of the hard drive and caused this.
Really guessing here. Only because i deleted files on my hard drive and it mounted.
Sorry i can't be of any more help.