FUN FACT: I stopped Windows 98 defragging midway through and it never worked ever after that. Further attempts to defrag failed.
What an OS.
2010 Dec 7
Truck: Magnets? in Other Help
If you put this device in a frictionless vacuum, the sum of forces applied to the disc will be 0. Look at your diagram: the magnet at 3 o'clock is doing nothing, the magnet at 1 o'clock is pushing CCW at a force of F(N), and the magnet at 5 o'clock is pulling CW at a force of F(N), etc etc etc with all magnets.
Basically the magnets do nothing. Maybe add mass to the disc, but nothing more.