On Thu, Dec 16, 2004 at 05:40:13AM -0800, TYMYT wrote:
> > think there is no problem
> > about this.
> > 
> > Thanks for your reply!
> 
> Such errors intend to float and appear from time to
> time. 
> Personally I do not trust cable change because I have
> seen cases when error comes back again.
> If you look for driver code you may find:
> WDCE_CRC 0x80 - CRC error (Ultra-DMA only)
> WDCE-BBK 0x80 - bad block detected
> >From this point I can assume that turning UltraDMA
> mode off
> would downgrade driver to avoid possible errors and
> save appropriate bad block checks.

No. The WDCE_BBK bit was before Ultra-DMA and is now obsolete.
Sure, turning UltraDMA off will disable the CRC checks at hardware level.
But this is a bad thing to do, because then if data corruption occurs on the
bus it won't be detected (this is why there is a CRC check in the first place).

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 26 ans d'experience feront toujours la difference
--