Holographic discs are different from DVDs, CDs and upcoming blue-laser products, HD-DVD and Blu-Ray, as the other formats only use the surface of the CD -sized disc, whereas holographic discs use the entire disc volume for storage. Data is stored on a holopgrahic disc by using light-sensitive crystals.
Maxell's announcement might spell trouble for HD-DVD and Blu-Ray formats that can store 15GB and 27GB (respectively) per data layer to a disc. If the format gains popularity as a storage space, it might put off people from buying the "next generation" technology and instead, wait for holographic discs to gain momentum in terms of studios and other manufacturers supporting it.
Maxell has formed an alliance with American InPhase Technologies to sell the product and currently a device capable of reading the discs will cost $15,000 (€12,700). But the discs themselves, despite being just pre-marketed to companies needing large amounts of storage space, are relatively cheap, costing $120 (€102) each.
Source: Red Herring (thanks p4_tt..)