DVD

DVDr (also known as "Digital Versatile Disc" or "Digital Video Disc") is a popular optical disc storage media format. Its major uses are video and data storage. Most DVDs are of the similar dimensions as compact discs (CDs) but store more than six times as much data.

Variations of the term DVD often explain the way data is stored on the discs: DVD-ROM has data which can merely be read and not written, DVD-R and DVD+R can only record data one time and then function as a DVD-ROM. DVD-RW and DVD+RW can both record and remove data multiple times. The wavelength used by normal DVD lasers is 650 nm, and thus has a red color.

DVD-Video and DVD-Audio discs respectively refer to correctly formatted and structured audio and video content. Other types of DVDs, counting those with video content, may be referred to as DVD-Data discs. After that generation High definition optical formats also use a disc identical in some aspects yet more higher than a DVD, such as Blu-ray Disc, the original DVD is infrequently given the retronym SD DVD (for standard definition