What is “YottaByte ?”

There are a thousand gigabytes in a terabyte,
a thousand terabytes in a petabyte,
a thousand petabytes in an exabyte,
a thousand exabytes in a zettabyte,
and a thousand zettabytes in a yottabyte.

In other words, a yottabyte is 1,000,000,000,000,000GB.