Back in the day when I was an intern MRI operator, I brought in some HDDs to wipe in a 2 Tesla magnet. There was a strong tug when bringing the HDDs into the strongest portion of the magnetic field but it was by no means so uncontrollable as to rip it from my hands.

Now, I never actually ran the MRI with the HDD in the bore, so I can't attest to the damage caused by doing that. But I imagine the results would be quite spectacular.