-----Original Message-----An interesting addition:
I've just got a reply from WD - they say my disk only supports PIO4 and not DMA...
> I'm taking the case off the machine right now, i can guarantee you its not UDMA
>compatible, simply because this thing was made in early1997. :)
>
> Here we go:
>
> MDL WDAC21600-00H
> P/N 99-004199-000
> CCC F3 20 FEB 97
> DCM: BHBBKLP
>
> I've got various of these hard drives in service, for the last 4 years. Many run in
>windows pc's, and DMA mode in osr2 and newer, works, and is noticeablely faster.
>
> Guennadi Liakhovetski wrote:
>
> > Glad all this discussion helped at least one of us:-))
> >
> > As for me, as I already mentioned in my last posting - I don't know why BIOS makes
>the difference (as in your case) if ide.txt says it shouldn't?! Ok, chipset, perhaps,
>is fine. But what about the hard drive? You told you had WDC AC21600H. Can you PLEASE
>check waht CCC is marked on its label? PLEASE! I am trying to get an answer from WD
>on this, but not yet alas...
> >
> > And - COME ON, GUYS! - somebody MUST know the answer - how to spot the guilty one
>- kernel configuration / BIOS / chipset / disk???
> >
> > Guennadi
> >
> > > back in, started playing in the bios. Finally fixed it. I was getting > the
>same operation not permitted, that you
> > > were,until i got that bios setting. But it's making me
> > > wonder if it's something similar in your bios!
> > > I know it wasn't the actual UDMA setting in the bios, i'm
> > > wondering what it was though. I'll put a keyboard on it,
> > > and poke around tonight or this weekend.
>
>
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