okay.. if a disc is a blu ray copy can i notice the difference? using conventional dvd players?
I'll try to explain his query: Blu-ray Disk are totally different format with the DVD. This is like comparison between the VCD & DVD. Now if you make a copy to make the dvd movie playable to VCD you are downgrading the format to VCD (This was happen before DVD copy playable to VCD). To make it short you are still viewing the VCD capacity. (This is similar to BD copy viewable to DVD)
By Technical comparison you can see the difference:
DVD - Max. 8.54 GB capacity (dual layer)
BD - Max. 50GB capacity (Dual Layer)
Image quality depends on Pixels only (digital) the higher the pixels the better the quality.while,
Video quality depends on Image Pixels and Frames per second (fps) the more information you can store on the media (disk) the better quality will show.
For better understanding, Marl_1 suggest to experience it personally.
BD is the future! D--N! once you see the difference it's the time to spend your savings