By Admin 
Short for digital versatile disc or digital video disc, a DVD or DVD-ROM is a disc capable of storing a significant amount more data than a standard compact disc. DVDs are widely used for storing and viewing movies and other data. The picture of the Matrix DVD movie disc is an example of a DVD movie. DVD-ROM drives that utilize these discs were first sold in 1997.
How much data can a DVD hold?
DVDs have differing capacities.
- One of the most common DVDs is the single-sided, single-layer disc, capable of holding 4.7 GB.
- The single-sided, double-layer disc can hold between 8.5-8.7 GB.
- The double-sided, single-layer disc is capable of holding 9.4 GB.
- Although rare, the double-sided, double-layer disc can hold up to 17.08 GB.
Physical measurements of a DVD
A DVD comes in two dimensions.
12 cm (120 mm): It is the most common size and generally used for storing software, movies, and operating system etc.
8 cm (80 mm): This size of DVDs are generally used for small devices like portable music player and video camera etc.
DVD Storage Capacity
On the basis of storage capacity, DVD can be divided in 4 types.
| No. | Type | Storage capacity |
| 1) | Single-sided, Single layer | 4.7 gb |
| 2) | Single-sided, Double layer | 8.5 gb to 8.7 gb |
| 3) | Double-sided, Single layer | 9.4 gb |
| 4) | Double-sided, Double layer | 17.08 gb |
Advantages
- Large storage capacity, e.g. 4.7 to 9 Gb
- Excellent sound and picture quality, so best option to store videos and audios
- Relatively cheap as they are mass-produced
- Information can be stored on both sides of DVD unlike CD.