The correct unit of measure for disk storage space or memory from the options you provided is megabyte. A megabyte (MB) is a unit commonly used to quantify data storage capacity and memory size.
To clarify the other options:
- Modem is a device that modulates and demodulates signals for communication.
- CPU stands for Central Processing Unit, which is the main part of a computer that performs calculations and operations.
- Megabuck is not a standard unit of measure in computing; it is a colloquial term often used to refer to a large sum of money.
So, megabyte is the correct answer.