I have a 2001 gs300, i took a nav disk from my friends 2004 gs430 and used it in my system for a road trip. Got back and put my old disk back in. DOESNT WORK NOW! Apparently the newer disks updates the firmware within the unit. I am now stuck without nav. I need to buy a 3rd generation disk 3.3, i have a guy telling me he can make me a copy for 100 bucks. I thought you couldnt copy the nav disks?? Any insight would be helpful. Thanks in advance.