Seagate to pay out to customers over GB definition

I really don't understand this one. So Seagate apparently used the literal definition of a gigabyte, 1,073,741,824 bytes, and then I guess they converted that to round GBs, so if you were buying a 50 GB HDD, then you were actually getting a 46.5 GB HDD, because they used 46.5 * 1.07e9 = 50? For this 7% discrepancy they are paying back 5% of purchase price... ummm... ok?

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