Drive Genius has the ability to detail hardware information about a specific storage device or hard drive connected to your computer.
To access drive information, including the size of a hard drive:
Select the drive from the left of the Drive Genius Window that you’d like to check the size of, then select the ‘Information’ utility in the Cleanup section of the feature window as shown below.
After selecting the feature, text detailing all available information about the device will appear. The drive Size will be listed near the top of this information, as shown in red below:
The drive size will be listed in both gigabytes and bytes, and you can also access additional information about your device from this screen.