Gears on blu ray

[totalwar23]

FJ-Warez said:

Wrong. CD-Rom is 1/13 the size of DVD9, while DVD9 is 1/7 the size of blu-ray, so the size leap is not the same.

Isn't a DVD9 1/3 of a single layer Bluray or 1/6 Of a double layer br???

Just wondering :P

 and isn't a CD 1/11-12 the size of a DL DVD?