What is the DVD-RAM (RE-Writable) ?
DVD-RAM discs use phase change recording where the active layer is made to change between amorphous and crystalline state by means of a laser at different power. DVD-RAM discs use Zoned CLV (ZCLV) method instead of CLV. Within each zone the data is written/read using the CAV method, the angular velocity changing from zone to zone to maintain a constant average linear velocity.
