Well, let's first establish exactly what type of disc you're trying to create because the terms "Blu-Ray" and "DVD" are mutually exclusive.
My guess is that you are trying to create a Hi-Def video disc. Now we need to establish what type of media you're trying to put it onto.
If you're trying to put it onto a DVD disc, then what you're creating is known as an AVCHD disc. This is a DVD disc, with HD content on it, which can only be played in a Blu-Ray player. A single layer DVD disc can hold about 40 minutes of HD content.
If you're trying to burn to a Blu-Ray disc, then that can only be done using a Blu-Ray recorder.
Creating a .ISO of your content first, and then burning to disc is a highly recommended option. If you look at the contents of the disc(s) you wrote using that method in Windows Explorer, what files/folders do you see? If all you see is your .ISO file, then the problem is that you didn't use the "Create Disc from ISO file" option, which will create the file structure within the .ISO file onto your disc.
So, help us to clear up just what you're trying to do so we can help you finish your projects.
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