|specifically what "formatting" tool are you using?|
You would not be using a formatting tool but a partitioning tool to remove and recreate a partition.
If attaching to another pc you would use Disk Management to remove, repartition and format.
Best way is with a new OS install which allows you at the beginning to remove, create a partition and format to then install the new OS.
You seem pretty new to all of this and I would caution you that you need to prepare for wiping a disk [like have the reinstall OS cd with all drivers on a disk]. Do a google seach and understand what you are doing before you do it or you can rurn your pc into a boat anchor.
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