Strange USB Pen problem

Hi, Just noticed this one. What component should the bug get put under though? If I use my USB pen and transfer something to it where the filename is all uppercase, the filename is converted to all lowercase (for example SENDA becomes senda). Everything still works, but it's a strange one. TTFN Paul -- "Space", it says, "is big. Really big. You just won't believe how vastly, hugely, mind-bogglingly big space really is. I mean, you may think it's a long way down the road to the chemists, but that's just *peanuts* compared to space, listen" - Hitch Hikers Guide to the Galaxy