[Ernest_at_the_Beach]

You are assuming that burning information on one layer will not effect reading the other layers. I don't think we know that yet.

Well TDK has disc media which can go up to 200 gigabyte by putting multi layers on the Media:

TDK develops 2X, 100GB Blu-ray Disc prototype

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TDK Corp. has developed a prototype Blu-ray Disc that can store twice as much data, and record it at twice the speed, as existing Blu-ray Discs.

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To achieve the higher capacity, TDK added two additional recording layers to the disc to take it up to four layers. Blu-ray Disc stores 25GB on each recording layer and the standard currently includes single layer and dual layer versions.

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[Ernest_at_the_Beach]

Not finding the reference on the 200 gig disc at the moment!