What is the largest data storage unit?

The smallest data unit is the bit, it takes either 0 or 1.

The byte =8bits

kilobyte=1000 bytes

megabyte=1000 kilobyte

gigabyte=1000 megabyte

terabyte=1000 gigabyte

petabyte=1000 terabyte

exabyte=1000 petabyte

zettabyte=1000 exabyte

yottabyte= 1000 zettabyte.

So the largest data storage unit is a yottabyte, which is equal to 1,000,000,000,000,000,000,000,000 bytes.