Ridata Double Layer DVD-R 4X inkjet printable in 25 pcs cakebox (Discontinued by Manufacturer) New technology allows material to be either read or recorded on one layer without affecting material on the other layer. Capacity: 8.5GB, Speed: 2.4X, Disc Top Surface: White Inkjet Printable Largest compatible DVD back-up and data archiving format for computer drives 4 hours DVD quality video or 16 hours VHS quality video Writes dummy data in remaining data area