The error device not ready is not commonly a program issue. It usually comes from the media on which you are trying to write the information. To discover what is causing this problem, you should Run ImgBurn, select Write Image Files to Disc then click Tools > Drive > Capabilities and verify that writing your type of media is allowed (e.g. DVD-R, DVD+R) - it should have a marked checkbox next to it. If it is allowed, you can try to see if your firmware is up to date by clicking Check for firmware updates.If this doesn't help, try cleaning the disc drive with proper tools and change the media type.