[fuzzfactor]

You are right.

That wouldn't require a Blu-ray.

The ISO expands quite a bit after it is installed to your SSD.

Maybe they are backing up their whole systems to the Blu-rays?

Or have big movie collections which some comments indicated was expected.

I've used USB for a while, don't think I've even used a DVD to install Windows.

Did use them to back up years ago, but now a HDD for that.