A complete haploid human genome is 3 billion base pairs. One byte encodes four basepairs, so that's 750MB in total; and it losslessly compresses to less than ha

A complete haploid human genome is 3 billion base pairs. One byte encodes four basepairs, so that's 750MB in total; and it losslessly compresses to less than half that amount. If you store more than one genome, any additional genome is only 4MB because human genomes are 99% identical. So you could store the genomes of an entire city on your hard drive.