It looks as if science has taken the data storage thing to a new level with their new found ability to store data on DNA. It's said that one gram of DNA could hold the equivalent of 100 billion DVDs. Although still a slow process it seems that it's becoming quite practical as costs for DNA coding are dropping (although not at a rate that will make it economically feasible for another 10 years or so). They've opted to stick with a binary system, much like a computer does with 0's and 1's, for encoding the data. DNA uses four characters to store information, A, C, G and T. A's and C's will be the 0's and G's and T's will substitute the 1's. They say that DNA storage has so much more availbale space because it's 3-dimensional. The data however cannot be overwritten but considering the medium's size, space should hardly be an issue.
http://www.poetryfoundation.org/harriet/2012/08/the-ultimate-in-compact-storage-media-dna-coding/?woo
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