2x Blu-ray Drive (72Mbps(9MB/s))
Single Layer (2x CLV) - Constant Linear Velocity (Same speed across entire disk)
Double Layer - Couldn't find any data but no games have been released on a double layer yet.
Entire Blu-ray Disk is read at 9MB/s.
12x DVD-Rom Drive SL (9.25MB/S-15.85MB/s(AVG ~8x(10.57MB/s) DL (4.36MB/s-10.57MB/s(AVG ~6x(7.93MB/s)
SL(DVD-5) 12x Max (5-12x Full CAV) - Constant Angular Velocity (Speed Varies from edge to edge)
DL(DVD-9) 8x Max (3.3-8x Full CAV) - Constant Angular Velocity (Speed Varies from edge to edge)
SL DVD is 1.57MB/s > SL Blu-ray
DL DVD is 1.07MB/s < SL Blu-ray
Majority of 360 games are on DVD-9.
Hitachi 12x DVD-Rom Faq (Page 2)
What is DVD?
Blu-ray.com Blu-ray FAQ
Wikipedia - Constant Linear Velocity
Wikipedia - Constant Angular Velocity
So anyway I did some research and I really just want to know if there is an truth to this or do I have it all wrong.