4 ms·

How?

• captainperl 8y ago
  Boundary-layer aerodynamics. The head is literally flying on a cushion of air.
• 6nf 8y ago
  If two surfaces are flat enough and moving fast enough, the tiny amount of air (or helium these days) causes them to act hydrodynamically and float across each other which is great cause there's zero friction which means they never wear out. The spindle in a hard drive is also an air bearing.