Actual BD Capacity issue

[quexos]

Hello,

I have read negative stuff on blu ray among HD-DVD fans, which is expected of course.

but one comment took my attention and i wanted to share it with the blu-ray side. i just would like to know if it's any true. it's about the 50 GB capacity, here is what that person said:

"1. HD30 has about a 95% yield rate AT 100% capacity.
2. BD50 has about a 50% yield rate, but that is when only using 85-90% of the disc capacity which is about 44.5GB.
3. If BD50 mfg tries to use 100% of the capacity the yield is about ZERO, which means none can be made. This has to do with the process of spin coating the coating on BD discs. It uses centrifigal force and there is coating buildup at the outer edge which makes it too thick to be read by a player."

the basic question is can blu-ray actually store 50GB of data on dual-layer discs or can it not ?

Thanks