We report the new data reproducing scheme for high density over 40GB per layer with a commercial Blu-ray
recordable disc. bER of 10-5 and 10-4 with 42.5GB and 45GB were experimentally obtained respectively using this new
data reproducing scheme which shows the possibility of achieving 50GB with a commercial single-layer Blu-ray disc.
We also propose a new evaluation parameter which is necessary for high density.