Ok I am having problems with this.. I made an ISO of my east disc (the one I use the most, original disc that came with the system) using Nero so its an nrg file... I then burnt that image using nero to a Dual layer Memorex 2.4x DVD+R DL disc... Twice now they seemed to work on the computer, but when I put them into my nav system it says on screen "reading format" then depending on the disc "invalid format" or "invalid disc"... can the N2 read +R's? should I burn it at a slower speed? What am I doing wrong here... any help would be great I really like to have backup discs just incase....