Ten-times-speed recording on dual layer Blu-ray disc recordable media

To clarify the potential of our 1x-4x speed dual layer Blu-ray disc recordable media (BD-R) in higher speed recordings, we evaluated the recording performance of each layer on over 4x speed recording. The approaches are simulations and experimentations under the condition of 2T mark recordings at 4x, 6x, and 10x speeds. As a result, we have successfully improved the speed dependence of dual layer BD-R by the write strategy. It is confirmed that the recording power ratio P(s)/P(w), where P(s) is the space power and P(w) is the peak write power, is one of the key parameters for achieving high-speed recording. It is expected that our dual layer BD-R could cover 1x-10x speeds.