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Blu Ray

How can a Blu ray disc not be a Digital Video Disc?

I don't think just because Blu Ray has a higher compression rate and can fit a lot more information on it makes it a different format. Isn't it just an improved DVD? Isn't this whole Blu ray thing a marketing scheme? And the fact that it requires a different kind of player doesn't mean it is a different format. When Hybrid cars that ran on battery power came out we didn't stop calling them cars, did we?

Ok.

Blu-ray uses a blue (violet) laser with a shorter wavelength than a DVD which uses a red laser (405 nm vs 650 nm) meaning a Blu-ray can hold much more data than a dvd (50gb dual layer vs 9gb dual layer)

Its just a name anyway. DVD actually stands for both digital video disc and digital versatile disc. blu-ray shortens to BD

also there was HD-DVD which just stood for high definition
(too many D's in my opinion)

and according to your argument we should be calling them cds (since cds were first)

or even further back than that (im not too sure what was before that)

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Transformers Trailer Blu Ray Disc - H.264 HD 1080p [ YouTube Reverence Video ]