# How Computers Store Information

A computer is any device that can store and process information. One unit of digitally stored information is equal to one bit. A bit is represented as either a 1 or a 0. The table below shows the relationship between the different file storage sizes used by computers.

Binary calculations are based on units of 1.024, and decimal calculations are based on uints of 1,000. This is because decimal calculations are based on units that have been rounded to the nearest 1,000 and therefore are different from the actual number of bytes used in binary calculations.

 Name Symbol Binary Measurement Decimal Measurement Number of Bytes Equal to kilobyte KB 2^10 10^3 1,024 1,024bytes megabyte MB 2^20 10^6 1,048,576 1,024KB gigabyte GB 2^30 10^9 1,073.741,824 1,024MB terabyte TB 2^40 10^l2 11,099,511,627,776 1,024GB petabyte PB 2^50 10^15 1, 125,899,906,842,624 1,024TB exabyte EB 2^60 10^l8 1, 152,921,504.1606,846,976 1,024PB zettabyte ZB 2^70 10^21 1,180,591,620,717,41 1,303,424 1,024EB yottabyte YB 2^80 10^24 1,208.925,819.614,629,174,706,176 1,024ZB