Blu-ray protection question

[xenex]

I don't know if anyone will be able to answer this, but it is something I have been wondering about. Not from any practical concern, just curious.

From the SlySoft forum and elsewhere I have heard that BD does "not use structural / bad sector protection" and that "if one encounters bad sectors or cannot read a BD, then it is a bad disc."

So my question is, why is this the case? Is there some compelling technical reason that BD cannot employ this, or is it just something that has not yet been done?

I have not encountered any disc that makes me think such is being used, but I am wondering / curious if this is something that might appear in the future, or if it is not possible on BD for some reason.

[Peer van Heuen]

From the SlySoft forum and elsewhere I have heard that BD does "not use structural / bad sector protection" and that "if one encounters bad sectors or cannot read a BD, then it is a bad disc."

So my question is, why is this the case? Is there some compelling technical reason that BD cannot employ this, or is it just something that has not yet been done?


I'm quite sure, it would be possible to master read errors onto a BD disc.

But thinking about it, I don't see quite as much potential on BDs to add bad sector protections that wouldn't be easy to defeat or wouldn't cause at least the slower BD players to stumble and stutter.

It's the cell concept together with the cell commands on DVDs that makes these "protections" (what a word for deliberately breaking something) possible in the first place.

I can think of a few similar things you could do on BD using BD-J, but they'd not be very reliable (the problem here being that BD-J is not processing events strictly in real time) and would have noticeable side effects.

But certainly there may be things that I'm just not thinking of...

Then, of course, blu-rays already have two "clean" (as in standardized) copy protection schemes, one of which constantly adapts to attacks and the other that will not be broken for another 9 years or so, I hear.
So why mess with those discs, when they already have all they need? :p