If you are a scifi author, it's a mistake to give any hard numbers in real-world units. You will, most likely, greatly underestimate. Even trying to greatly overestimate, you will underestimate.

Commander Data's specifications in the Star Trek TNG episode The Measure of a Man from 1989: 800 quadrillion bits of storage, computing at 60 trillion operations per second.

100 petabytes. That's a big machine. A very big machine. But supercomputers now have memories measured in petabytes.

They never used "bits" again in any Star Trek script. It was kiloquads and gigaquads from then on.