DVD-R 4x Dual Layer 5pk Jewel Case Key Features Write-once DVDR 8.5GB Native Capacity 4x Write Speed Jewel case Package Type Verbatim Dual Layer Discs provide a massive 8.5GB (2.6 for 8cm products) storage capacity. The dual layer of recording has been made possible by the creation of a new substrate layer that sits in between each recording layer. This allows the laser beam to record on both layers. Once the first layer has been recorded, the laser re focused to record on the second layer.