Originally Posted by Danny Stewart
It's actually a 20 GB hard drive, Ross. They always make them like that, with not all of the space fully usable. I'm not sure why exactly. On my old computer, the overhead on the drive was so bad that only 131 GB was useable on a 160 GB drive!
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Its because they are sold with the metric definition of tkilo, mega etc, kilo meaning 1,000 etc while the computer defines kilo, mega etc differently, kilo to the computer is 1,024. At small amounts the difference isn't noticable but when you deal with larger sizes it becomes more noticable.