> Hard drives don't spin until they're told to.  This is normal,
> although many default configs/people override it.  It's done to
> reduce the initial current draw (load) when a system boots.
>
> The intial clicking sounds, btw, were the logic and head actuator self-tests.
>

I don't know if it makes any difference, but the drive doesn't just make one or
two click when you first turn it on. Instead it makes a rapid, soft,
clic-clic-clic-clic-click sound and will do so indefinately, until I finally
turn on the Mac and have it spin up.

I can't check to make sure at the moment, but I think it then stops and reverts
back to its constant clicking when I turn the Mac off.

Thanks everyone for the advice,
Adam.


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