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Subject: DMA errors
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I have a 40GB Maxtor D740X-6L disk, and have been unable to install 5.4
or 6.0 on it.  I get errors:

ad0: FAILURE WRITE_DMA STATUS=51 <READY,DSC,ERROR> error=84 (IRC,
ABORTED) LBA=..

as soon as I try to commmit the changes in sysinstall.

I have checked that the IDE cable is the 80-wire type, and cleaned up
the connections and so on.

I tried installing Ubuntu on this disk, and everything went perfectly. 
(Those guys have done a really great job, by the way).

Is there some configuration trick I have missed?