Reformatting 1T hdd

Tried to reformat my 1T hdd because I can not open it anymore but windows can't format it., it says make sure that the disk is not ready-only and then try again. Tried it through disk management and shows a 931.51 GB RAW Healthy (primary partition). Help me format it.
 
Have you tried a third party software such as KillDisk. To wipe the hard drive.? This may solve your problem and let you reformat it.
 
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