I get lots of the following:
Aug 29 10:53:23 ros /netbsd: sbc0: pdma_in: timeout len=3072 count=8192
Aug 29 10:53:23 ros /netbsd: sd0(sbc0:0:0): medium error, info = 1351982
(decimal), data = 6
d b6 db 6d b6 db 6d b6 db 6d
Aug 29 10:53:23 ros /netbsd: sbc0: pdma_in: timeout len=3072 count=8192
Aug 29 10:53:24 ros /netbsd: sd0(sbc0:0:0): medium error, info = 1351982
(decimal), data = 6
d b6 db 6d b6 db 6d b6 db 6d
Aug 29 10:53:24 ros /netbsd: sbc0: pdma_in: timeout len=3072 count=8192
Aug 29 10:53:24 ros /netbsd: sd0(sbc0:0:0): medium error, info = 1384750
(decimal), data = 6
d b6 db 6d b6 db 6d b6 db 6d
Aug 29 10:53:24 ros /netbsd: sbc0: pdma_in: timeout len=3072 count=8192
Aug 29 10:53:24 ros /netbsd: sd0(sbc0:0:0): medium error, info = 1384750
(decimal), data = 6
d b6 db 6d b6 db 6d b6 db 6d
Aug 29 10:53:24 ros /netbsd: sbc0: pdma_in: timeout len=3072 count=8192
Aug 29 10:53:24 ros /netbsd: sd0(sbc0:0:0): medium error, info = 1417518
(decimal), data = 6
d b6 db 6d b6 db 6d b6 db 6d
Aug 29 10:53:24 ros /netbsd: sbc0: pdma_in: timeout len=3072 count=8192
Aug 29 10:53:24 ros /netbsd: sd0(sbc0:0:0): medium error, info = 1417518
(decimal), data = 6
d b6 db 6d b6 db 6d b6 db 6d

MacOS formatter utils report that indeed these are defective blocks, but
when I reformatted the drive the last time trough, the defective block list
was reset and the util reported no errors.  In other words, somehow MacBSD
is corrupting the disk.

I've gotten similar errors with both the NCR and the SBC driver.  I'm not
sure what to do now.  I can't seem to find any pattern to the errors, only
that they occur when I'm accessing the disk, and that lots of disk activity
is accompanied by lots of errors.

I've used this same drive (which is relatively new) under 1.1 and had no
problems.

Right now I'm using GENERIC_SBC_2.  I've just done an fsck and its
corrected some of the problems that have cropped up, so I'll see what
happens.

What can I do??

At 12:20 AM 8/25/96, Scott Reynolds wrote:
>On Sat, 24 Aug 1996, Chris Mason wrote:
>
>> I switched from an NCR driver to:
>>
>> NetBSD 1.2_BETA (GENERICSBC) #2: Thu Jul 18 23:25:28 CDT 1996
>>
>> about three weeks ago because of disk error (media) problems.
>
>Well, the SBC kernel won't correct media problems.  It will correct disk
>corruption problems that some people seem to experience with certain disks
>that are otherwise known to be good.
>
>> Does anyone know anything about SBC and disk corruption or disk errors?  Is
>> there a newer version of the SBC kernel that I can get?
>
>That was the last version I compiled.  I'm not aware of it having any
>problems on disks in general, though it doesn't seem to like
>magneto-optical (MO) disks.


 _____________________________________________________________________
|Christopher Mason - cmason@nyx.net  cmason@nando.net  cmason@cmu.edu |
|"You can always count on a murderer for a fancy prose style."-Nabokov|
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