Re: AHCI power saving (was Re: Ten hours on X60s)

[Tejun Heo]

Mark Lord wrote:
> Jeff Garzik wrote:
> > Andi Kleen wrote:
> >
> > > How does it shorten its life?
> >
> > Parks your hard drive heads many thousands of times more often than it 
> > does without the aggressive PM features.
>
> Spinning-down would definitely shorten the drive lifespan.  Does it do 
> that?
>
> Parking heads is more like just doing some extra (long) seeks.
> Is this documented somewhere as being a life-shortening action?

I wrote this in the other thread but writing here too for documentation 
purpose.

* HL-DT-ST DVD-RAM GSA-H30N locks up completely on slumber.  Physical 
power removal and reapply is the only to recover it.

* Some WD raptors spin down (yeap, that's right, it spins down) on slumber.

Wonderful world of ATA.  :-P

--
tejun
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