Sort of like a mirror........
A CD is sort of like a mirror..the 'burnt' information being like one's reflection.
A double CD is possible, but it would need to be the two chemical layers fused back-to-back..therefore more expensive..and with nowhere to put any information.
I believe they were emade for a short time..with no commercial success ...
All the information on a DVD is one side anyway..but just with two differnet focuses for the two sets of information..sort of bi-focal..
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