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Size doesn't matter .Its only for consumer comfort size is made universal not more than 120 mm.
If each and every company starts making discs of different sizes there we may face a situation of buying disc player ffor different sizes of discs
it can be less than 120mm but not more than that.
Conventional Blu-ray Discs contain 25 GB per layer, with dual layer discs (50 GB) being the industry standard for feature-length video discs. Triple layer discs (100 GB) and quadruple layers (128 GB) are available for BD-XL.The name Blu-ray Disc refers to the blue laser used to read the disc, which allows information to be stored at a greater density than is possible with the longer-wavelength red laser used forDVDs