Actually, I am having this same message trying to burn an .iso to CD-R using a CD-RW drive. The message in the notification area says something like, 'Media not present, Drive closed'. The drive recognizes the disc and type just fine, but ImgBurn doesn't seem to like it. I'll try and get the log into the post in a bit... but in the mean time, if anyone has seen this before and has some direction to share, it would be appreciated.