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Seems like there's a lot of competition in the race to put massive storage on a disk. C-3d has an interesting alternative technology based on flourescent dyes and incoherent light (Flourescent Multilayer Disks and Cards). They've even demonstrated a movie-length HDTV format disk. (For various reasons though, I think the card format has significant advantages over the disk format which I wish the powers-that-be would appreciate, namely that they are easier to handle, easier to store and transport, more durable, and simpler to use than disks, i.e. kid/idiot/klutz friendly). Assuming they don't have problems with dye bleaching, I think their technology could beat the others in cost of media and readers.
 
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