Doesnt that damage the harddrive when running due to the disk applying pressure to the motor?
How can a platter apply "pressure to the motor"? A rotating object experiences the same forces no matter what plane it rotates on - excepting, not within close proximity to a black hole, where tidal forces will have an effect. But if you're that close to a black hole...
Besides, the spindles of modern HDDs are floating in a liquid oil bearing mechanism which is also hemetically sealed.
So - you're safe.