When making an ISO from a DVD. ImgBurn 2580. I have the appropriate checkbox default for MDS checked in Settings. Sometimes the MDS file is auto-generated along with the ISO, and often not. This is happening across a few different computers and versions of Windows. I'm not seeing any pattern to it. It is possible to create the MDS file separately, after the fact, from the menu function. What am I missing here ?

If necessary, I could take this to the ImgBurn forum, which does still seem to be active. (?)