Comparison between HD Disc and Blue Ray

[ruthie]

I have been trying to find some technical information on the above subject as I am doing a case study for a college course and am finding it incredibly difficult to find the in depth information I need. So, I was wondering if anybody out there would be able to point me in the right direction. Firstly I need to know about the different codecs used for compression on HD & BD. I am also struggling to find any technical information on the signal flow between the laser and the disc, how the information is written and retrieved, i have the basics re the pits and the layers but i need to obtain a deeper level of information, which i don't truly understand myself. If anyone can help me I would be soo grateful as I am very confused at the moment.

[Sinizter]

3rd google result when searching for "blu ray" ... It is not "blue".

AFAIK pit and laser reading is all pretty much the same as CD/DVD stuff - except different wavelengths and smaller "pits" so greater data density.