> > >    > Interesting. Could you try to just remove the PDC_IS_265 here:
> > > 
> > > Thanks.  This change works well.  My drives are working as
> > > UDMA 5 now regarding to boot-time messages, though I have no
> > > way to check the actual speed.
> > 
> > dd if=/dev/rwd0d bs=64k count=16384 of=/dev/null
> > 
> > and you will see how much seconds is needed to read 1GB of data.
> 
> No, with this you'll get the speed of the medium, not the speed of
> bus. You can see a difference between Ultra/33 and Ultra/66 but not

you will get real speed depending on both.