About to install win7 and HD not the detected at right size? Help

I'm installing win7 for the first time on a new build and at the screen that shows the disk0 unallocated space its showing a total size of 596.2gb for thte total size and the same for the unallocated space. The HD is a 640gb wd caviar black. Is this right or is something wrong? Thanks.
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  1. Best answer
    thats correct.

    advertised sizes are basically shown to be more than the genuine available space. since the OS works it out in binary math, the number of bytes to calculate a gig is lower.
    so the drive has 640gb when caculated in base ten math, but only 596 when calculated in binary math.

    plsu, a small portion of a HDD is used for firmware or random software that you cannot access. this is only a fraction though, the biggest thing is the deffierent math used to work it out.
  2. Thanks for the prompt reply. Appreciate it.
  3. happy to help :)
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