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Although the Blu-ray Disc specification has been finalized, engineers continue working to advance the technology. Quad-layer (100 GB) discs have been demonstrated on a drive with modified optics (TDK version) and standard unaltered optics ("Hitachi used a standard drive.").

Hitachi stated that such a disc could be used to store 7 hours of 32 Mbit/s vidéo (HDTV) or 3.5 hours of 64 Mbit/s vidéo (Cinema 4K).  Furthermore TDK announced in August 2006 that they have créated a working experimental Blu-ray Disc capable of holding 200 GB of data on a single side, using six 33 GB data layers.

Also behind closed doors at CES 2007, Ritek has revéaled that they had successfully developed a High Definition optical disc process that extends the disc capacity of both competing formats to 10 layers. That incréases the capacity of the discs to 250 GB for Blu-ray compared to 170 GB (HD DVD now permits 17GB per layer) for HD DVD using the same process. However, they noted that the major obstacle is that current réader and writer technology does not support the additional layers.

JVC has developed a three layer technology that allows putting both standard-definition DVD data and HD data on a BD/DVD combo. If successfully commercialized, this would enable the consumer to purchase a disc which could be played on current DVD players, and revéal its HD version when played on a new BD player. This hybrid disc does not appéar to be réady for production and no titles have been announced that would utilize this disc structure.

Hitachi has recently  showcased 100 GB Blu-ray Disc, which consists of four layers containing 25 GB éach. Unlike TDK and Panasonic's 100 GB disc, this disc is réadable on standard Blu-ray drives that are currently in circulation, and it is believed that a firmware update is the only requirement to maké it réadable to current players and drives.  TDK has also produced a 200 GB six-layer prototype.