Verbatim Double Layer Discs provide a massive 8.5GB storage capacity. The double layer of recording has been made possible by the creation of a new substrate layer that sits in between each recording layer, that allows the laser **** record on both layers. Once the first layer has been recorded, the laser is re-focused to record on the second layer.
Great for backing up high-capacity discs. This is certainly the cheapest I've seen them.....ever!