On Thu, 29 Aug 1996, Chris Mason wrote:

>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
>
>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.
>
>>> 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 there a newer version of the SBC kernel that I can get?

I'm having similar problems with 1.2_BETA Generic #67, but it's calmed
down quite a bit. I've had widespread corruption under 1.1 Generic #47,
1.1B Generic #2 and they took down the HD so I had to reformat it and
start over. The SBC driver wouldn't boot.

I'm currently using 1.2_BETA Generic #67, and had the media errors on my
CD-ROM for a couple of weeks, then HD started to have the errors. I
removed all external devices and the HD has been happy as a clam with no
errors. I ran fsck on it after I removed the external devices and there
was quite a few errors which have been corrected. 

Under the older kernels, they would work for a while then go rapidly
downhill. 

I have a Mac II with a Quantum Trailblazer 810MB HD internal, and used to
have an old Toshiba single-speed external CD-ROM. Also used to have
connected a Fujitsu 40MB that NEVER gave any problems. 

Right now, I'm looking at a combination of kernel and external devices.

Hope this helps... 

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Greg Putrich - Internet: gregp@primenet.com                          [PINE]
Public Key 27E97EBD = 62 0E B9 A2 45 D2 64 AC 8A B4 6D 9D 5B 23 90 1F

    "This is not rocket science, it's brain surgery." - C.M. Burns