Layer-jump recording (LJR) now provides multi-session burning of dual-layer DVD-R media. In other words, data can be added to a medium over several burning sessions, with the sessions appearing in the sequential order in which they were originally recorded. Both Nero and the burner manufacturerâ€™s firmware previously only supported disc-at-once (DAO) mode meaning data could be written to a DVD-R only one time.
Unlike dual-layer recording, in which data is first written to one layer and then to the other, layer-jump recording alternates between both layers during the burning process, thereby evenly distributing the data between both layers. The written area of both layers expands evenly outwards with each burning session. This means adjacent layer areas always contain data, resulting in a reduction in background noise and better signal quality. This, in turn, leads to higher read compatibility even on DVD-ROM drives."