Throughout the life of the format, DVD has been primarily limited to at most two layers, keeping the format at a maximum storage space of under 9GB. The new high-definition formats, however, appear to have taken a page from hard disk drives when it comes at adding additional storage.
Just as how adding additional platters inside a hard disk drive provides more storage, optical media makers are finding ways to stack layers of readable surface inside a polymer disc to increase capacity. Hitachi revealed this week at CEATEC JAPAN 2007 that it has successfully developed a quad-layer Blu-ray Disc that is capable of storing 100GB of data.
The concept multi-layer discs is practiced by many other media labs, but Hitachi claims that its quad-layer technology would be compatible with existing Blu-ray Disc drives after a firmware update. Prior developments of greater than dual layer discs have required special hardware to read the new media.
Hitachi, Blu-ray, DVD, Disc, Blu-ray Disc, Storage