I'm not so sure about this. I explored this option a while ago and in order to get autorun to work on a flash drive, you need an application installed like "Autorun USB."

I have a thumb drive I want to automatically back up every time I plug it in. I want it to back up to C:\backup\{datetimestamp}

I had to get a program called Autorun USB to get it to work, but with this and a .bat file I was able to get immediate automatic backing up of my thumb drive every time I plugged it in.

I believe we're using the term "nuked the fridge" now.