Definitions for "Yottabyte"
280 (2 to the 80th power) bytes.
2^80 = 1,208,925,819,614,629,174,706,176 bytes, which is 1,024 zettabytes.
1024 Zettabytes or 1 208 925 819 614 629 174 706 176 bytes (2** 80 bytes)
Keywords:  zetabytes, one
One Yottabyte (YB) is 1000 Zetabytes (ZB).
a million billion gigabytes
a million trillion megabytes.