Example:
15 b = 1.027194e-10 DVD (2 layers, 2 sides)
1 b = 6.84796e-12 DVD (2 layers, 2 sides) | 1 DVD (2 layers, 2 sides) = 1.460289e+11 b
Conversion Steps:
15 × (1 / 1.460289e+11) = 1.027194e-10