Originally posted by: Darth Richard

I though that Blu-ray still used NTSC and PAL??!?!

http://en.wikipedia.org/wiki/1080p

Essentially, Blu-ray has the ability to display video at either 24/50/60Hz, like Film or PAL/NTSC TV signals, so depending at what frame rate the footage was filmed/produced it can be put onto Blu-Ray disc at whatever speed it needs to be in, either 24/25/30fps. I'm hoping that over time, especially as the whole HD thing is adopted en masse, we will see a universal frame rate accepted. The whole resolution thing is not an issue anymore as everything will be at 1920×1080 (for 1080 naturally).

PAL and NTSC are really terms used to define the colour encoding systems in analogue TV signals, but is used (kinda incorrectly) to describe resolution and frame rate, but it's not a term that is appropriate for HD signals. The only difference between regions now for HD is the frame rate.

The 24Hz Disc is for Blu-ray only though. HD DVD doesn't allow this, it's still holding on dearly to the old DVD technology of 50 or 60HZ only. IMHO the MAIN reason that Blu-ray should be the successor and not HD DVD.

All this is to my understanding though, correct me if I'm wrong, I'm no expert