Subject: Re: Soft Errors / DMA errors on IBM 18G ATAPI disk (me too)
To: None <port-i386@NetBSD.ORG>
From: Kent Polk <>
List: port-i386
Date: 10/22/1999 15:51:26
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.