when I first read this post I thought it was spam but I googled RECOVERFAB and they are a German company that offered the service that was required to fix the problem gsirbu described so under forum rules I don't think this thread can be labeled as spam.
Some people probably have never used flash drives/usb sticks before so I would like to pass on the following tips.
Never remove a stick from your pc without first doing right click on it and choosing eject. You will find the stick under THIS PC
As gsirbu has found out even usb sticks are not 100% reliable . Call this overkill if you want but I have separate pens for doc/photos/vids/music/unrun downloads , and just in case the worse happens I have a compilation of all of them on another pen.
Never leave a stick you are not using in a pc , just because it is on the outside of your case instead of the inside don't get fooled into thinking it wont get hit by an attacker or a virus , it is still part of your working pc