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Do any of you buy New Scientist magazine? This week's issue had a very interesting article regarding Holographic DVD's. It's quite a good read. The basic points were that Holographic DVD's are almost certainly the successor to Blu-Ray and HD-DVD, they are being developed by 2 rival firms (one of which is being backed by Sony), and they can hold up to 1.2 Terabytes of data (which is about 300 DVD's worth of data).
Here is an old(ish) article from the New Scientist website that I was able to find which will tell you more about the technology behind Holographic DVD's.
http://www.newscientist.com/article.ns?id=dn8370
New Scientist wrote:
The discs, at 13 centimetres across, are a little wider than conventional DVDs, and slightly thicker. Normal DVDs record data by measuring microscopic ridges on the surface of a spinning disc. Two competing successors to the DVD format – Blu-ray and HD-DVD – use the same technique but exploit shorter wavelengths of light to cram more information onto a surface.
Holographic memory, by contrast, stores information in a light-sensitive crystal material using the interference of laser light. The process involves splitting a single light beam into two and then passing one through a semi-transparent material. This is a grid that acts like a filter, changing different parts of the beam to encode bits of information.
Some guy on some forum wrote:
The upshot of this? Well, I personally think that this could well be whats inside the next XBox or/and Sony Playstation 4. As one format war will come to an end, so another one will begin. At present, Holographic DVD's will only be used by banks, governments, medical companies and IT firms who need to back up tons of data every single day at a very high speed but eventually, in a couple of years at most, the costs will come down and the aim is to get it into the homes of most consumers.
I strong believe optical storage is going out like magnetic FDD did, do here comes solid state flash storage with 8GB in a credit card and now 2TB solid state by yellow machine, virtually indestructible!
Optical storage, its a degradable, non-archival, breakable, scratchable, mistakeable-for-a-frisbee, easily destroyed storage medium... I mean, 50GB of data you can snap in half?
So, yes, I think the future is solid state or Flash storage; think how much you can store on a tiny SD or CF card, with no moving parts, almost impossible to destroy, resistant to shack and even water, RAID Drives can store GB's of data, and it cant be snapped.
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