How to Measure Big Data?

We can Measure Big Data in the following scale:
1000 Gigabytes (GB) = 1 Terabyte (TB)
1000 Terabytes = 1 Petabyte (PB)
1000 Petabytes = 1 Exabyte (EB)
1000 Exabytes = 1 Zettabyte (ZB)
1000 Zettabytes = 1 Yottabyte (YB)