https://www.tomshardware.com/reviews/double,839-5.html
LG GSA-4120B - Double-Layer DVD: Lite-On, LG and BenQ | Tom's Hardware
Jul 7, 2004 - Double-layer technology, which makes it possible to store 8.5 GB of data or four hours of DVD quality video (MPEG-2) on a DVD, is finally here. We tested the...