Why is it only 120GB when you plug the drive in?
I opened the package and plugged it into my USB 3.0 drive and it only reads 120GBs.
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A gigabyte is 1,073,741,824 bytes...not an even 1,000,000...so when you calculate the size it will always be a smaller number. look at your picture, the free space is 129 million bytes, not 120