3tb hard drive dosn't format completely

SACHIN231078

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Aug 30, 2014
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I just bought my Toshiba 3 terabyte hard drive. It will not format using the disk management utility in windows 7. In addition, when the drive is displayed in the utility, it shows 746.52 gigabytes of the 3 terabytes as unallocated. I'd like the whole drive to be formatted.SO I NEED HELP