A double layer DVD can store up to how many MB of data?
Answer Description
A Dual/Double Layer DVD holds 8.5 GB of data. Depending on who you ask, 8.5GB is either 8500 MB (5.5 * 1000) or 8704 MB (5.5 * 1024). The official size of a gigabyte is 1000 MB and a gibibyte is 1024 MB. This was not always the case, causing the confusion over 1000 vs 1024 megabytes to a gigabyte. You should be aware that both could be true depending on the vendor and technology being used.
Wikipedia
DVD+R DL (DL stands for Double Layer) also called DVD+R9, is a derivative of the DVD+R format created by the DVD+RW Alliance. Its use was first demonstrated in October 2003. DVD+R DL discs employ two recordable dye layers, each capable of storing nearly the 4.7 GB capacity of a single-layer disc, almost doubling the total disc capacity to 8.5 GB. Discs can be read in many DVD devices (older units are less compatible) and can …
DVD+R DL - Wikipedia, the free encyclopedia