Sony DADC - Manual (Page 5)

3
The DVD family
A DVD consists of two halves, where each half disc
is 0.6 mm thick holding one or two layers of
information.
The total capacity of a single side, dual layer DVD is 8.5 GB,
which is 13 times the data capacity of today’s CD-ROMs.
DVD-5
DVD-9
1.2mm
0.6mm
substrate
substrate
movable Iens
single side
single layer
1.2mm
0.6mm
substrate
substrate
movable Iens
single side
dual layer
The total capacity of a single side, single layer DVD is 4.7 GB,
which is 7 times the data capacity of today’s CD-ROMs.
Disc Type Capacity 12 cm
4.7 GB
8.5 GB
9.4 GB
17.1 GB
DVD-5 single sided, single layer
DVD-9 single sided, dual layer
DVD-10 double sided, single layer
DVD-18 double sided, dual layer
1.2. DVD Types and Formats
semi reflective
layer
The DVD format provides multiple configurations of
data layers. Each layer provides additional data
capacity.
reflective
layer
reflective
layer