06-10-2014 01:02 PM
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I understand you want to wipe the hard drive so you can sell the notebook. First please stop the existing process. If you are unable to cancel it then just restart the notebook.
I would do a system recovery back to factory, which will delete all you data. As you did not provide the Operating System you are running, I am provided more then one option. You will need to select the correct one.
Please provide me any details, if you would like further assistance.