DVD
Introduction
DVD initially stood for Digital Video Disk but now stands for Digital Versatile Disc. Like a CD, DVD is an optical storage system for read-only, recordable, and rewritable applications. But, being similar to a CD in many ways, DVD is considered to be a CD future replacement.
The main differences between the CD and DVD are summarized in Table 4-7 and also in Figure 4-17.
Figure 4-17. Comparison of the main features of the CD and DVD discs.
| Feature | DVD | CD-ROM |
|---|---|---|
| Substrate diameter/thickness (mm) | 120/1.2 | 120/1.2 |
| Sides | 1 or 2 | 1 |
| Layers per side | 1 or 2 | 1 |
| Capacity (GB) | 4.7, 8.54, 9.4, or 17 | ~ 0.7 |
| Track pitch (micrometers) |
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