Non-rewritable feature optimal for storing and distributing critical data, which should not be overwritten. A DVD-R disc is able to contain a maximum of either 4.7 or 3.95 billion bytes of information on each side, depending on the type of blank media used. These transfer rates, coupled with DVD-Rs capacity and conformance to worldwide DVD standards, makes it an extremely viable and cost effective storage medium. The fundamental technology employed is similar to that used by CD-R, except that data is written at a higher rate and density.
Recording begins at the inner radius and ends at the outer.
As the dye layer is heated, it is permanently altered such that microscopic marks are formed in the pre-groove. These recorded marks differ in length depending on how long the write laser is turned on and off, which is how information is stored on the disc. The light sensitivity of the recording layer has been tuned to an appropriate wavelength of light so that exposure to ambient light or playback lasers will not damage a recording. Conversely, recorded marks are not very reflective, meaning that very little of the light is returned. DVD Video components are not necessary, however, if DVD Video material is not accessed or is not present on a disc.