Blue-Ray and HD DVDs come with DRM (Digital Rights Management) software burnt in the cd.
Anti Copy software. I believe.


On Apr 21, 2010, at 12:23 PM, Matty Sarro wrote:

From a purely storage standpoing that's correct. The other difference is that CD and DVD are industry standard formats backed by the ISO. BluRay is a
sony proprietary format.

On Wed, Apr 21, 2010 at 1:19 PM, Dan Joseph <> wrote:

On Wed, Apr 21, 2010 at 1:16 PM, tedd <> wrote:

I'm no expert on media, but the only difference between CD, DVD, Blu-Ray
the amount of data they can hold, right? IOW, you can still record video, audio, pictures, files, all digital data on all media - it's just that Blu-Ray can hold more than DVD and DVD holds more than CD, isn't that

Speaking purely data, yessir.  That's your difference.

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