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Date:      Fri, 7 Sep 2001 15:52:16 +0200
From:      "Ruben de Groot" <RGROOT@dto.tudelft.nl>
To:        freebsd-questions@freebsd.org
Subject:   Re: UDMA question
Message-ID:  <9najeh$l15$1@news1.xs4all.nl>
In-Reply-To: <20010907.11163300@ideal.darlow.co.uk>

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"Neil Darlow" <neil@darlow.co.UK> wrote:

>   /dev/ad0  - UDMA/66 drive
>   /dev/ad2  - UDMA/66 drive
>   /dev/acd0 - UDMA/33 cdrom
>
> The cdrom drive is slave to /dev/ad0 and bios says it's in PIO4.
>
> The system runs fine but /dev/ad0 drops to UDMA/33 operation which I
> assume is caused by the presence of the cdrom.
>
> Is there any way I can restore UDMA/66 operation to /dev/ad0 with the
> setting of driver flags etc?
>
> Please don't say remove the cdrom and, yes, UDMA/66 cables are used
> for both drive chains.

I'm going to say it anyway: remove the cdrom.
You can't have UDMA/66 and UDMA/33 on the same cable at the same time.

Sorrie




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