on 03/07/15 I have ordered 2 for me. There are parasites (video) when transferring large file ... one still works fine while the other is no longer recognized by the computer 1 out of 4 as you say that I replaced I note that the 3.8.15 my second key to the same fault, I made a sauvegare however on the package that I did not keep it written guarantee 10 years I say 10 times too optimistic. and as the key kingstone are the first to ask me Default I cmandé another brand this time to remplcement