Panasonic says that its new 4-layer 100GB Blu-ray discs are so durable that you'll be able to retrieve the data in 100 years' time (which reminds us a lot of the claims they originally made about CDs, as one may recall). The company has been at work for the last few years making use of "tellurium suboxide palladium-doped phase-change recording films" (or Te-O-Pd, for those in the know) to improve the capacity of its Blu-ray discs. But the company has now achieved what appears to be the optimal ratio for durability and size: a 100GB disc that will last you a century. Of course, a few months ago Panasonic scientists completed a research paper showing a disc-making technique that kicked that timeframe up to 500 years, but could only hold 50GB of data. So that may indicate that if you have 1GB that you really need to be preserved for the next several thousand years, you may want to get some serious cash together and give Panasonic a ring. Of course, all of these developments assume that firstly in 100 years Blu-ray readers will have won the format war, and secondly, will still be around.

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