Pebibyte

A pebibyte (peta binary byte, abbreviated PiB) is a large unit of measurement of bytes (computer memory). 
1 pebibyte = 250 bytes = 1,125,899,906,842,624 bytes = 1,024 tebibytes. It is related to the petabyte which is 1015 bytes.
1024 pebibytes make one exbibyte.