Learn in the textbookOptical Disc Storage Media — CD, DVD, Blu-ray
DefinitionA DVD-R is a write-once DVD on which the user can write data only once.
ExplanationLike a CD-R, it records by using laser heat to alter a dye recording layer, so written areas cannot be erased. It holds about 4.7GB on one side with one layer and is used for saving video or keeping data that should stay unchanged.
Memory hookIt carries the same "-R" as CD-R, a sibling that inherits the same write-once nature.