This is evidently a common problem.  After lots of search engine probing, I
found a working solution.

Uninstall the drive and IDE controller. After XP reinstalls the drivers, and
you reboot, you MUST set the drive to PIO only.  Then when you switch it
back to "DMA when available" it will correctly detect the UDMA drive.
Thanks,
            Phillip Roey
                [log in to unmask]

> Hi Group,
>
> I'm helping a friend upgrade his computer to Win XP.  The HD always shows
up
> in PIO mode.  I have it set to DMA if available in the HD controller
> properties.  Have tried the usual driver reninstalls, changed 80 pin
cables,
> etc.  It is an UDMA 100 drive, and shows such in the bios.  MB is an
Amptron
> 810.  The DVD-ROM does show up in DMA mode.
>
> I remember reading about a registry hack to force it into DMA, but can't
> track it down now that I need it. Any ideas?
>
> TIA,
>         Phillip Roey
>                             [log in to unmask]
>

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