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Cc: "freebsd-current@freebsd.org" <freebsd-current@freebsd.org>
Subject: Re: ATA/DMA problem after reboot
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Yousef Raffah wrote:
> Can these be used as a general rule? I mean I have a Tecra A4 and as of
> now, my settings are the defaults:
> root@RedDevil# atacontrol mode acd0
> current mode = UDMA33
> root@RedDevil# atacontrol mode ad0
> current mode = UDMA100
> 
> Can I use UDMA66 for both of them?

It depends on hardware, those UDMA66 modes are stable on that machine. 
If there is no problems do not change anything. Lowering one step might 
help to ata timeout problems.

FreeBSD sets dma mode to highest supported by default i think.