sector had to invent its own scale based on the byte. by byte consists of eight bits representing zeros or ones so a single character of text corresponds to one byte. one page a kilobyte. three hundred pages a megabyte. a library a gigabyte. five libraries a d.v.d. . six million books a terabyte or a stack of two hundred d.v.d.'s. or two hundred metre high stack of d.v.d.'s represents a petabyte. a one kilometer stack of d.v.d.'s an exabyte is the equivalent of all the information produced by humanity through two thousand and three a stack of d.v.d.'s stretching from the earth to the moon represents one point eight