So if that’s the case I tend to blame your original disc.
Well, and your drive.
I beleive, that disc may has some aging, so somewhat fading already. (Maybe scratches are present too?)
The DVD player you used to play it, still can adapt to that fading, and can play it, but for your external drive that’s already too much.
If the content on that disc is extremely procious and impossible to get from other source, probably a different model from a different vendor may be able to read it.
I used to produce many-many DVD’s before and I liked Lite-On drives more than LG drives, they seemed to be much more reliable and lasting, but need to admit, I never-ever had a bluray device, only DVD-RW devices.
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