Take your next hard drive and open it up. You'll most likely find that the strongest permanent magnets in your house are less that 1/2 inch away from your hard drive platters. I have taken the head actuator magnets and placed one on my palm and the other on the back of my hand, and the magnetic field was strong enough to hold them together.
Granted they are set up in the drive to cancel each other out, but still... damn strong.
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Take your next hard drive and open it up. You'll most likely find that the strongest permanent magnets in your house are less that 1/2 inch away from your hard drive platters. I have taken the head actuator magnets and placed one on my palm and the other on the back of my hand, and the magnetic field was strong enough to hold them together.
Granted they are set up in the drive to cancel each other out, but still... damn strong.