Shutting down your PC and then turning it back on, is actually harder on your PC then just leaving it running.
The way it was explained to me is think of the bearings in your harddrive like tires on your car. A standing quarter mile is going to wear your tires much more than a rolling quarter mile will.
The force required and the friction created from a dead stop to build the momentum needed is much greater than waking a harddrive from idle. Even when idle, your harddrive still spins, but slower, so it will not take as much force to get it running to full speed as it would starting from a dead stop.
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