Answer: 2 trillion bytes
Explanation:
A terabyte (TB) is equal to 1 trillion bytes. To find the amount of hard drive space after doubling, we need to multiply the original amount by 2.
1 terabyte = 1 trillion bytes
Doubling the amount:
1 terabyte * 2 = 2 terabytes
1 terabyte is equal to 1 trillion bytes, so 2 terabytes would be equal to 2 trillion bytes.
Therefore, after doubling the amount of hard drive space, Callie's computer has 2 trillion bytes of hard drive space.