Work through the steps in the blue link. Open windows diskpart at system startup this is an outline of the methods to boot (start) the pc to open diskpart so you can. Following the tutorial on here i'm running diskpart command clean all on a 500gb hdd but i started it at 17.00 yesterday and it's now.
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Diskpart is not needed for troubleshooting windows 7 failure to boot. This will show you how to use the clean or clean all command on a selected disk to delete all of it's mbr or gpt partitions, volumes,. In diskpart, what is the functional difference between format and clean when focused on a certain partition/volume?