Turisu said:

That's interesting about movies being delivered on HDDs. I had no idea that's how things were done nowadays. :)

I didn't know anything about it either until I read an article in my local newspaper about a month ago.

You see, I live in a small city in Sweden where we've had the same cinema running since 1940! It was rebuilt in 1989 though so since then everything has been very modern and pretty top notch, or so I thought. Next year, they will open a new cinema in my city with Sweden's largest projection screen and all new equipment. This means they will close the old one.

So the newspaper had interviewed a projectionist who had worked many years at our cinema and there were some photos of him with the harddrives, and he said that it's much easier than having to change film reels!

I guess the reason for the harddrives is also that digital cinema has a different colorspace than blu-rays and maybe 4K resolution too? Wouldn't fit on a disc.