As for renaming your files you can easily do that on a computer. All my tracks are named Artist - Song title and thats how they show on the screen. You can make a Windows Media Play List the radio will read. MP3's generally have a tag that shows all the details of the artist, song, album etc that info also shows if you press the Info button. I don't know if it read it from the tag or the Play List.
I use a 2GB Kingston flash drive with 270 MP3's on it in 16 folders 3/4 full on my RCD310, you can read the
Volkswagen Media Device Interface (MDI) Specifications, this is a useful site to keep in your favourites.
You can download the lastest
Volkswagen Media Device Interface (MDI) Firmware Upgrade 0111 KW22-2010 with came out week 22 2010. I tried this when I had a problem with mine
MDI firmware upgrade.
I also read somewhere that a user updated his firmware to the latest and when he took it into the dealers for something else they must have noticed now he says his warranty is void for doing his own updates. Well they didn't say anything to me.
