On Thu, 21 Oct 2010 12:21:10 +0000
Alexander Best <arun...@freebsd.org> wrote:

 
> atacontrol(8) says that:
> 
>     "You should not set a spindown timeout on a disk with / or syslog
> logging on it as the disk will be worn out spinning down and up all
> the time."
> 
> this seems to indicate that spinning down a disk has quite an impact.

That's mostly likely a hang-over from older disk technologies when the
heads touched the surface on spinning down.  
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