Firstly thank you to Pocatello for taking the time to reply to my posts in such detail. I know that takes a lot of time and effort to do that.
As you've seen I can do long posts so won't reply to all of it. Partly as a lot of it still goes whoosh with me.
I would like to pick up on one sentence of yours though.
The reason I posted about if the person bothered to read my posts he would have read on at least
three of my posts that I get that the picture is better and the sound if better. In his post he then decided to do the rolling eyes

which came over as sarcasm. Maybe he didn't mean it. I don't know.
I will happily admit that I don't know hardly anything about film production. I also don't know much about computers so when this one goes wrong I give it to my brother to sort out. Could I learn more? Yes. Do I care enough to do it? No.
I don't need to know how to program a computer to turn it on and send an email, use Word or surf the net.
When it comes to films at home. I put the DVD or Blu ray in the machine and hit play. The picture appears on the screen I watch the film. I put it back in the box. I don't sit there and wonder whether it was shot in 35mm 70mm or with a polaroid camera put together as a flip book.
In the sentence I quoted of yours, you too say my complaints (what complaints?) come from a fundamental misunderstanding of technology. I'm not complaining about anything, but you are right, I am confused and I don't have lots of knowledge. I have never denied it.
I don't know abut lots of things. Cricket rugby, fashion, music, international politics, history, geography. I'm not a moron but I'm also not a person that claims to know stuff that I don't.
So just to clarify it for you and other people on the thread.
I do not understand technology in great depth. There's no denying it. No avoiding the issue. I don't understand technology in great depth and I'm fine with that.
Now onto notpctoday.
Again I'll pick out two sections of your post. The first paragraph is covered in my reply to Pocatello.
No I dont want more info. I'm not the OP. The person who made the OP is called scorpio2000. He/she asked if there was any other reason other than better sound and picture to get a blu ray.
The only thing I originally tried to do was to answer their question and all I said was I think there is a
possibility that a Blu Ray disc may be able to hold more extras or data than a DVD.
My logic is this. A CD has a bigger storage capacity than a floppy disc. A DVD has more than a CD and so
possibly a blu ray disc has more than a DVD.
If this is true then logic would also suggest it means the blu ray releases
may have more bonus material than their DVD versions as they can hold more data.
That may be right, that may be wrong. I don't know and don't claim too, but I'm sure you know if it is or not, but isn't that logical and a fair assumption?
Second quote
Spot on! Thank you.

I'm not rubbishing Blu Ray. I'm not saying it's the work of Satan and should be destroyed. I have a Blu Ray player and some discs although I haven't watched them yet.
I'm just not good at picking things up. I can read a manual but I struggle with it. I can be told something and I don't get it. But if I see something I'm able to visualise it in my head.
I bought a computer although I had never used one before. I worked out how to set it up using logic. The pin/plug is the same size as that socket so it probably goes in there as the other lead's pin/plug is too big for it.
Once it was up and running I pictured in my head what the person on BBC Bitesize on TV had done to open a window. I remembered she moved the mouse up to the top of the screen over there. Slowly by clicking on bits and pieces I found bits I remembered or looked familiar.
I can install hardware into a PC casing. If I have to configure etc then I'm stuffed.
I once got talked through as I went into BIOS. I couldn't get out of there fast enough. I was scared I was going to change something and totally break the thing and be left with a dead computer.