I can't answer the question fully, but I do know a trick for not needing to have the disc in the drive. The discs will have folders on them labeled East and West respectively... copy those to a place on your hard drive, then drill down into the registry and change where Mapsource looks for the data. I don't know it off the top of my head, but it's not hard to find - HKEY LOCAL MACHINE>SOFTWARE>Garmin or something like that. Works great!