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If you bought a 256mb (or 512/1gb) Memory Stick PRO Duo and the capacity is actually less, you didn't get ripped off. The difference has to do with the fact that software considers bytes to be a power of 2, while hardware considers it to be powers of 10. Thus, 1 kilobyte in software is 2 to the 10th power (1024 bytes) while in hardware it is 10 to the 3rd power (1000 bytes). As sizes go up, the discrepancy gets larger. Rest assured that this is not a mistake, it is simply the way all hard drives and memory cards work.
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