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On Sat, 21 Jul 2001, Jan H. van Gils wrote:

> 2986992 of 2986992-2987007 (wd0 bn 2986992; cn 2963 tn 4 sn 36), retrying"
> 	"date time hostname /netbsd: wd0: soft error (corrected)"
>
> I have never seen these errors when I was running Linux on
> my system.

Linux often downshifts (upon startup) to a slower transfer mode, maybe
just PIO.  I don't know if this is why you haven't seen these errors on
startup.

NetBSD tries to run the interface as fast as the controller and disk can
go.  If, during operation, errors are frequent, then NetBSD will "downshift"
to a slower transfer mode.  You can see if /var/log/messages reports that
the NetBSD driver has changed to a slower mode.

Lastly, Manuel posted the attached program last week; run it on your disk
if you want to "scrub" it.  Be sure the S.M.A.R.T. option in "on" in your
BIOS; this will cause hard sector errors to be remapped to spare sectors
transparently to the OS when a "write sector" operation fails.

-Mike

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