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Why are you using a dot instead of space? Anyways, I always thought that there was a nice magnet at the center of the disk which pulled the arm back to the center when the power was cut. That's what makes the characteristic loud "click" when the hard drive powers down (or is unplugged). Do you have any links that would back up what you're saying?
– Vilx-
Commented Oct 3, 2013 at 12:04
"Since a 0 represents a magnetic south and 1 represents a magnetic north" -- Wrong, it's flux change that indicate bit state.
– sawdust
Commented Mar 10, 2016 at 4:16
1

@Vilx- -- The resting position of the actuator is off the platters, which is away from the center or spindle. Modern drives use a voice coil, so the arm is retracted with stored energy; there's no magnet for retraction.
– sawdust
Commented Mar 10, 2016 at 4:21

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