Which is the largest unit of measurement for computer data?

A Yottabyte

Explanation:

The units of measurement for data are as follows

Byte, B, 8 bits Kilobyte, KB, 1024 bytes Megabyte, MB, 1024 kilobytes Gigabyte GB, 1024 megabytes Terabyte TB, 1024 gigabytes Petabyte PB, 1024 terabytes Exabyte, EB, 1024 petabytes Zettabyte, ZB, 1024 exabytes Yottabyte, YB, 1024 zettabytes