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Date:      Sat, 21 Jul 2001 12:00:07 -0400
From:      Bill Moran <wmoran@iowna.com>
To:        User & Ian Patrick Thomas <ipthomas_77@yahoo.com>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: How to change UDMA mode on ata drives
Message-ID:  <3B59A707.F4D60AD0@iowna.com>
References:  <3B5987B1.C5310BB0@iowna.com> <20010721114445.C5115@localhost>

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User & Ian Patrick Thomas wrote:
> 
> As it was put forth by Bill Moran on Sat, Jul 21, 2001 at 09:46:25AM -0400...
> > I've got an ata100 drive that's buggy under ata100. I want to throttle it
> > back to ata66 mode to see if the problem still exists. How is this done?
> >
> > -Bill
> >
> 
>         Try this
> 
> sysctl -a | grep "hw.ata.*"
> 
>         and check out man sysctl.
> 
> Ian

Thanks for the reply.

The only options I have through sysctl are hw.atamodes, and hw.ata.ata_dma
both of which only allow turning DMA on and off. I would like to leave it
on, but force the controller to use UDMA4 (ata66) instead of UDMA5 (ata100)

Is there a method for this, or is it an on/off proposition?

-Bill

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