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Subject: RE: Re: hard disk spin up
From: Nielsen Linus (ext) (Linus.Nielsen_at_elema.siemens.se)
Date: 2002-07-26


> > We have no control whatsoever of the disk rotation. It is the
> > hard disk itself that does that. We can only tell to spin up and down.
>
> Thats what I'm thinking about when I say PWM. You know, ask
> it to spin up, then say 10ms later ask it to spin down, then
> ask it to spin up again, and wait slightly longer (say 20ms)
> then ask it to spin down. And so on and so on increasing the
> time until the disk has stated spinning fast enough.

Actually. there is no "spin up/down" command to the hard drive. All we do is
to try to get some data from it, and it automatically spins up. And then we
can't communicate with the drive until the disk access is finished.

/Linus



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