has developed a Blu-ray compatible disk that can hold 400GB of data on 16 layers.
The company currently only has a read-only disk available but expects to be able to produce recordable discs.
Each of the layers can hold 25 GB of data – equivalent to one single “standard” Blu-ray disc layer.

Multi-layer disks have existed for a while. Normal DVD players and burners are usually able to read and write to dual-layer disks.
It has been a challenge for Pioneer to get a clear signal from each of the recording layers of the disk, without picking up distortion from other layers.

The electronics company invented a disk structure that reduces crosstalk from adjacent layers, resulting in a 16-layer optical disk that can playback high-quality signals from every layer.
No infomration has been given so far on availability and pricing.

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