How to clearly destroy hard drive?

Bear with me here. I have a laptop where the issue is that I can not get to the desktop (McAfee fatal error). In a few weeks IT is going to inspect it. If they manage to fix it, there is personal info on the desktop that I would rather not have them see. Is there a way to "cleanly" open the laptop and... show more Bear with me here. I have a laptop where the issue is that I can not get to the desktop (McAfee fatal error). In a few weeks IT is going to inspect it. If they manage to fix it, there is personal info on the desktop that I would rather not have them see. Is there a way to "cleanly" open the laptop and damage the HD so that it is impossible to ever recover the files on the desktop?
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