So if MGS4 takes up to 30 Gbs and it was a 4 year dev time + 70 millions budget, do you really thing that anybody will try to make use of this 400Gb disk??? :P LOL

That is obscene!

 Yes, cos the space can be used for hi def graphics using higher res textures, hi def quality FMV, hi def uncompressed audio. Allow developers to have multiple routes/ more location's in an open world type game.  And it would'nt have to cost more to develope for.

These n-layer blu-ray disks are technical stunts and bear no relevance to the real world. A few months ago, everybody was complaining how incredibly difficult it was to manufacture dual-layer discs with satisfactory yields (and affordable to buy). Imagine the yields and prices for 16-layer discs and you see how utterly irrelevant these items are (and probably will be) for mass production.

I didn't say PS4 won't SUPPORT the availability of 400 gigs, I'm saying the games will not use 400 gigs..I'm not from the future, so obviously I don't know this 100%..but you could say I'm pretty damn sure of it.

Not saying the PS3 is compatible or not.

But what you state is a common misconception, although limitations can push developers towards creative workarounds, executeable code is usually tiny in comparison to graphics and audio data, more space available on disc relates far more towards being able to provide much more varierty of top quality 7.1 lossless audio, less compromised higher quality textures and such.

The PS3 architecture pushes programmers (executable code) towards efficiency, which in turn results into huge performance gains on the PS3 and decent gains on PCs, 360 and other platforms as well.

 That was then, Blu-ray process has been upgraded since then. Blu-ray's process is as easy to do as DVD now and nearly as cheap.

Granted 16 layer Blu-ray may be a while of yet. But atleast they are possible.

Face it Blu-ray's 25Gb - TB's will be produced cheaply, way before Holographic disc ever hits an affordable price. Blu-ray will hit mass producion far sooner.

that is a lot of porn on one BR :p

all this means is if any game developer opts to go with this format, they won't need to worry about compressing data anymore and use higher end textures as well as better quality sound.

What did Bill Gates say about PC memory. 640Mb wil be all thats needed. Now I have 4Gb in my PC. Alot more than 640Mb is required to do the very basic of tasks.

Too say 400Gb Blu-ray won't be required, you could be going down the same path that Bill Gate's was on. And look how that turned out.

Or no in-game loading times like Uncharted (invisible streaming), but with more higher quality graphics and audio and up to about 16 times the game lenght of audio/graphics varierty.

Seriously, if the PS3 can be made to be compatible it's just too expensive to produce 16 layered discs at this point on a mass scale. Developing companies will stick to the amount of layers they feel will provide them the ideal balance between requirements, costs and competitive edge.