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Alright, let me correct you here...
HD and Blueray aren't the same, you are correct on that. First, to understand the difference, I will compare HD DVD (which has now officially died) to DVD and Blueray.
First of all, Blueray has nothing to do with the resolution of the video as you have implied, just like you can burn anything onto a DVD, you can burn anything onto a Blueray or an HD DVD. There are some MAXIMUM capabilites for each type of disc though, which has to do with how much information the disc can hold, the maximum resolution a disc can play, etc.
First, lets look at Storage Capacities (per layer)
DVD -4.4 GB
HD DVD - 15 GB
Blueray - 25 GB
Approx. Transfer Rate (Mb/s)
DVD - 5
HD DVD - 19
Blueray - 36
Maximum Video Resolution
DVD - 720 x 480
HD DVD - 1920 x 1080
Blueray - 1920 x 1080
This is where you mentions 60i, which is also incorrect. It can be 60 frames per second, but the i would have to do with the 1080, if the 1080 lines are interlaced or progressive. Blueray can be in 1080p, it does not have to be 1080i.
Cover Layer
DVD - 0.6 mm
HD DVD - 0.6 mm
Blueray - .1 mm
Since blueray has now officially beat out HD DVD on the market, this is where the cost issue comes into play. In order to store more date on a disc that is the same size as DVD, they had to decrease the wavelength of the laser, and they also had to increase the numerical aperture, on top of that the cover layer had to be made thinner, which is why it is only .1mm thick, they did this to avoid unwanted optical effects, which lets the focus the laser beam on a smaller spot, thus allowing more information on one disc. But also making that cover layer thinner, Blueray discs became more expensive.
On a second note, Blueray discs also have a hard coating on them to protect them from scratches, but it also makes them more expensive to develop.
Video Codecs -
DVD - MPEG-2 or MPEG-1
HD DVD - Microsoft VC-9, MPEG-2, MPEG-4 AVC (H.264)
Blueray - Microsoft VC-9, MPEG-2, MPEG-4 AVC (H.264)
To sum it up. Blueray is too new and it costs too much to produce. Remember when THE GAME, and GLOBAL STORMING came out, they weren't released in DVD, although many people had DVD players. You just have to wait a while until a system catches on. Now that the war between HD DVD and Blueray is over (as you can see Blueray is far superior), prices should start dropping.
One more thing, to whomever above stated that the PS3 is the only blueray player, you are very wrong on that, most companies make blueray players, however the PS3 is part of the reason that Blueray won the war over HD DVD.
NOW, I HOPE I HAVE ANSWERED ALL OF YOUR QUESTIONS!!!!