I need answers to a few questions REALY FASTLY...

[Pilouna]

hi, please answer to this today or tomorrow, after that it's too late!
i don't find informations about a few details, for my presentation, i already told you about it:

1. in the pdf document "what's_blu-ray", on page 2, they talk about "light spot (area size)" that goes from 100% to 19%, WHAT IS IT????

2. the reading system, like for CD and DVD, that has the laser and reads the information, does it use a "prisme" or a "mirror"??? and is there a difference between "prisme" and "mirror" or is it the same?

3. mBps, does it mean "mega bytes per second"?

4. what do you know about "numerical aperture"? what is it?

5. can you explain about "pit lenght, track pitch, mark lenght"? IS pit lenght the same that mark lenght?

I ALREADY TELL YOU A BIG BIG THANK YOU, I HOPE I GET THE ANSWER TODAY OR TOMORROW, THANK YOU!!!!!!!!!!!!!!!

i'll put my "hardware" presentation on the web afterwards if you are interrested... HELP ME :P

[Anonymous]

1- the focus of the beam is smaller because of the blue laser and higher numerical aperture. I guess they normalise it to either the CD or DVD.

2- A prisme is a triangular piece of glass where light is refracted ('gebogen') when passing through it.. A mirror reflects light.

3- Not sure.

4- It's a measure for the strength of the lense combined with the index of refraction of the medium. http://glossary.its.bldrdoc.gov/fs-1...-025/_3615.htm

5- I think pit is used for for Read Only. It's a little hole. Mark is used for Rewritable, it's a amorphous 'mark' in a crystalline surrounding. Track pitch is how close the different tracks are to eachother.

[Pilouna]

Thank you

Well, it's done, I presented it
it was not so good, 'cause it seems I didn't talk enough about two or three important things,
well, anyway, if you're interrested by my presentation (it's in french) you can email me: pilouna@lavache.com and i'll send it to you.