The 2.9 billion base pairs of the haploid human genome correspond to a maximum of about 725 megabytes of data, since every base pair can be coded by 2 bits. Since individual genomes vary by less than 1% from each other, they can be losslessly compressed to roughly 4 megabytes. - http://stackoverflow.com/questions/8954571/how-much-memory-would-be-required-to-store-human-dna