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From: Kees Plonsz <replyREMOVE_THIS@serve.myown.framed.net>
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Subject: Re: idle, standby, suspend harddisk
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Pol Hallen wrote on Monday 27 February 2006 12:18:

> Hi all :-)
> 
> i have a server with several hd always on
> 
> i want idle hard disk after several minutes
> 
> the bios of mother b. is not good for do this, and i'd like use a software
> which atailde or others..
> 
> with ataidle i can idle my hd but how check if hd is really in idle mode?
> 
> Are there others ports 4 do this?
> 
> With linux i use hdparm, but there isn't on freebsd.
> 
> Anyone can i help me?
> 
> Thanks :-)
>  
I don't know much about linux but perhaps "atacontrol" is your answer.
After a "atacontrol detach" the disk spins down. Better umount it first
or the system will hang if you use that disk again. 
You have to use atacontrol to attach it again.