Digital versatile disk: A high density development of the compact disk. It is the same size as a CD but stores from 4.38 GB (seven times CD capacity) on a single sided, single layer disk. DVDs can also be double sided or dual layer-storing even more data. The capacities commonly available at present: DVD-5: 4.7 GB (1 side, 1 layer) DVD-9: 8.5 GB (1 side, 2 layers) DVD-10: 9.4 GB (2 sides, 1 layer each) DVD-18: 17.0 GB (2 sides, 2 layers) DVD-R: 4.7 GB (1 side, 1 layer) (write once) DVD-RAM: 2.6 GB (per side, 1 layer) (rewritable) DVD-RAM: 4.7 GB (per side, 1 layer) (rewritable).