Plug in your dvdr and then Try going to Settings, Control Panel, then Administrative Tools, then Computer Management. Find your drive that is the dvdr and change it's drive letter to the one you want it to be. That should do it for you.
I want the drive letter of my Sony DVDR/RW to be X, but every time I reboot it changes itself to drive H. I am using xp home, SP2. Thank you for any ideas.