Example:
15 DVD (2 layers, 1 side) = 1.095217e+12 b
1 DVD (2 layers, 1 side) = 7.301444e+10 b | 1 b = 1.369592e-11 DVD (2 layers, 1 side)
Conversion Steps:
15 × (7.301444e+10 / 1) = 1.095217e+12