What are the criteria of a disc to be called a blu ray disc?

H

Hyoroemon

New member
I just wondering about these blu/blue ray things.

1.What are the criteria of a disc to be called a blu ray disc?
2.Does having blue color on its back side( side with no picture) making its a blue ray?
And last question, does the original blu ray has difference from original DVD/CD? Like graphic or something else?
@crazyjoker: Uh, does it has to be blue on its back?
 
Blu Ray disk is an optical storage system, a blu ray disk uses blue laser to store information(hence the name) which allows it to store more information (by increasing the density of info) as compared to a dvd which uses a red laser.
 
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