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A comment on Increasing head-parking interval from default on Western Digital drives (2014). Parent comment
There is friction - between the head arm and the "load/unload ramp", as it's called. That's what lifts the heads off the platter when they're parked.
Here is an extreme close-up of what this looks like:
http://cdn1.goughlui.com/wp-content/uploads/2013/03/DSC_0016...
So a piece of metal rubs against a plastic ramp every time the head parks.
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There is friction - between the head arm and the "load/unload ramp", as it's called. That's what lifts the heads off the platter when they're parked.
Here is an extreme close-up of what this looks like:
http://cdn1.goughlui.com/wp-content/uploads/2013/03/DSC_0016...
So a piece of metal rubs against a plastic ramp every time the head parks.