Are DVD+R DL (double-layer) discs compatible with existing equipment?
In October 2003, the DVD+RW Alliance announced specifications for DVD+R DL (double-layer) discs, with a capacity of 8.5 gigabytes. Like DVD+RW and the existing single-layer DVD+R, DVD+R DL was designed to be fully compatible with existing DVD-Video players and DVD-ROM drives. In that respect, a recorded DVD+R DL disc behaves identical to a pre-recorded double-layer DVD when used in read-only equipment.