Pioneer showed its super multi-layer read-only optical disc, with a total capacity of 400GB at the IT Month fair in Taipei. This amount is huge compared to 25 GB single layer Blu-ray discs.
The technology of the super multi-layer read-only disc is based on Blu-ray Disc, with a breakthrough in material of reflective layers. In the near future 1 TB will be possible with this technology.
400 GB optical disc from Pioneer