DVD format

DVD format
- Digital Versatile disc
- Digital Video Disk
- burn DVD +R => 4483 MB
- single-sided, single-layered disc is 4.7 gigabytes

On a double-layered disk, each data layer is half as thick as that used in the CD-ROM.
Data can, therefore, be written in two layers. The outer layer is semi transparent to allow reading of the underlying silver layer. The reading laser operates at two different intensities, the stronger one reads the inner, silver layer. This increases the storage capacity to 8.5 Gb of data and eliminates the necessity of removing and flipping the disk.

DVD-5
Single-sided, single-layered disc with 4.7Gb capacity

DVD-9
Single-sided, double-layered with 8.5Gb capacity

DVD-10
Double-sided, single-layered disc with 9.4Gb capacity

DVD-18
Double-sided, double-layered disc with 17Gb capacity

Digital Versatile disc - Recordable (DVD-R) is a type of write once, read many (WORM) DVD format that allows the user to record a single time on a DVD disk.

Digital Versatile disc - Rewritable (DVD-RW) is a DVD format that allows the user to record and erase multiple times on a single DVD disk.