[Zon]

There's roughly one thousand gigabytes to a terabyte. Thus a hundred gigabytes is roughly one tenth the capacity of a terabyte.

Megabyte = 1,048,576 bytes
Gigabyte = 1,073,741,824 bytes
Terabyte = 1,099,511,627,776 bytes.

[DoughtyOne]

That was my take as well. Thanks.

[Post Toasties]

Note that the excerpted phrase included the quantitative terms 'gigabyte' and 'terabit', hence my comment.

[Alan Chapman]

Petabyte = 1,125,899,906,842,624 bytes
Exabyte = 1,152,921,504,606,846,976 bytes
Zettabyte = 1,180,591,620,717,411,303,424 bytes
Yottabyte = 1,208,925,819,614,629,174,706,176 bytes