This is a known issue, I have highlighted it to many people many times.

The original BMW map CDs and software CDs are all Mode2/Form1.

I use ImgBurn all the time and ensure that I always burn error-free Mode2/Form1 CDs.

Especially on a Mk3 nav, the nav gets into an endless loop with a Mode1 CD and won't load the software.

The answer is: never use a Mode1 CD in a BMW nav :-)