On 22 Oct 1999, Kent Polk wrote:

> On 18 Oct 1999 23:15:00 -0500, Thor Lancelot Simon wrote:
> >On Mon, Oct 18, 1999 at 09:16:06PM +0000, Kent Polk wrote:
> >> On 17 Oct 1999 12:55:00 -0500, Tom Javen wrote:
> >> >
> >> >I got the same problem here with 20G IBM , seems that my motherboard (asus
> >> >p5a) with acer chipset has some problems on ultra dma .
> >> 
> >> Same here with a Quantum Fireball except it appears to work fine once it
> >> downshifts:
> >
> >Of course it does -- "DMA mode 2" doesn't have checksums, so there's no
> >way to know if your data's being corrupted or not!
> >
> >The logical thing to do is probably to downshift to UDMA mode 1 first.
> 
> It was suggested that I first try using a UDMA66 cable with the
> above drive. I installed one (on a short leash and with no other
> device on the cable) and absolutely nothing changed.  I have a
> hard time believing this is an electrical problem.
> 
Upgraded from dma 2 to udma1 and it still works , udma 4 does not work.

There is no speed difference , tested with bonnie , what is the ultra in
the ultra-dma ?

Tom
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