How to Force UDMA100 Mode on Boot?

Nikolas Britton nikolas.britton at
Wed Aug 17 09:01:06 GMT 2005

On 8/16/05, Mark Kane <mark at> wrote:
> If I eliminate one of the drives and run one on each channel, they all
> work fine together. I'm not sure if that rc.local trick that was
> suggested would work now. I don't know if drives get mounted before
> rc.local would get executed or not.

Doesn't the drive have to be mounted (ad0s1a) first before the system
can read /etc/rc.conf and before it can execute /sbin/atacontrol?...
Theirs your answer.

A UDMA100 controllor will force those drives to slow down ;-)

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