Appendix YDVD formats
DVD refers to a 12 cm digital disc which can have a variety of options for capacity and use, described below. It achieves a much higher storage capacity than CD by using a shorter wavelength laser beam, smaller pits and narrower track pitch (1). Single-sided and double-sided versions are possible, with one or two layers of information on each side.
DVD-ROM
The basic pre-recorded DVD which can support DVD-Video and DVD- Audio formatted data. Its storage options are shown in Table App.Y.1.
Table App.Y.1 DVD capacities
| Name | Structure | Capacity |
| DVD-5 | Single-sided, single layer | 4.7 gigabytes |
| DVD-9 | Single-sided, dual layer | 8.5 gigabytes |
| DVD-10 | Double-sided, single layer | 9.4 gigabytes |
| DVD-14 | Double-sided, one single, ... |
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