john asked:
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?
So how can Blu Ray be a different format than DVD?
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{ 4 comments }
There are several differences between Blu-Ray and standard DVDs. I will name a couple. Blu-Ray uses a blue laser. DVDs use a red one. The data on a Blu-Ray disc is stored much closer to the unlabled side of the disc (hence the need for the anti-scratch coating) than on a DVD. It is a totally different specification. btw, DVD stands for Digital Versatile Disc.
It is not a DVD disc because if you put it in a DVD player, it will simply don’t work!
It is a disc, but you can’t call it DVD.
Well, Philips had a Disc that was Digital and had video on it before DVDs came out so was that a DVD? No it was a CD that you could watch a movie on. So maybe DVDs aren’t DVDs at all, maybe they are actually VCDs. No, that isn’t right because the disc isn’t the same at all. And Neither is Blu-Ray. Even though all three are the same dimensions and are all read with a laser of some kind and appear the same to the naked eye.they are all different kinds of discs.
In short, DVD (Digital VERSATILE Disc) is not merely a descriptive term. It is a name. Or to use your analogy if it isn’t a hybrid version of a car at all, it is more of a tank.
A blu-ray dvd is actually a software program.
Standard DVD has a menu system and video files. All DVD players know how to read through this.
But BluRay disks are a BD-Java program that run on players like a video game/computer software.
So it’s not a ’static’ disk of information, but a program.