it's all about math from what i understand and how it's all calculated as i cant be bothered to write it all out go here and it will explain it http://en.wikipedia.org/wiki/Hard_disk_drive#Capacity after reading i hope you understand why the numbers are always different
It's a common misconseption, and it's something that happens with any physical storage device like hard drives, phones, SD cards, etc. While the OS does take up some memory, its primarily how companies define a gigabyte.
Hardware companies advertise memory in terms of 1000s. So 1 GB = 1,000MB = 1,000,000 KB etc. Software however, deals with memory in terms of 1024. So 1 GB = 1024 MB = 1,048,576 KB etc.
So your hard drive has 320,000,000,000 bytes of storage on it. The software will read that as 320GB/1024 = 312,500,000 KB. Divide that by 1024 again and you get 305,175.78125 MB. Divide it once more and you get 298.02GB, about the size that your PS3 is showing. So really, it's just a matter of how you define a Gigabyte.
Now, since that takes a while to work out every time you want to convert between the two memory sizes, you can simplify things a little bit by knowing that the amount of storage your computer shows is about 93.13% the size advertised. So all you have to do is 320 * .9313 = 298.016 which is pretty close to what I got above. This will work with any hard drive size (only when working with gigabytes) so a 500GB hard will only show up as about 500 * .9313 = 465.65GB on a computer, PS3 or other device.
dk00111
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