Which unit of digital information is equal to one billion gigabytes?

The unit of digital information that is equal to one billion gigabytes is indeed the exabyte. To understand this, it's helpful to look at the hierarchical structure of digital information units.

1. A gigabyte (GB) is equal to 1,000 megabytes (MB).

2. A terabyte (TB) is equal to 1,000 gigabytes.

3. A petabyte (PB) is equal to 1,000 terabytes.

4. An exabyte (EB) is equal to 1,000 petabytes.

Therefore, to determine how many gigabytes are in an exabyte, you can multiply the units:

• 1 EB = 1,000 PB

• 1 PB = 1,000 TB

• 1 TB = 1,000 GB

So, 1 EB = 1,000 x 1,000 x 1,000 GB = 1 billion gigabytes.

This conversion shows that one exabyte represents an enormous amount of data, precisely equating to one billion gigabytes. It highlights the exponential growth in data storage capacities as we move up in units, making the exabyte a fitting answer to the question posed.