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Date: Fri, 5 Dec 1997 10:05:59 -0800 (PST)
From: Tom <tom@sdf.com>
To: Yun-Ching Lee <ycl+@CMU.EDU>
cc: freebsd-scsi@freebsd.org
Subject: Re: ahc deferred error
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On Thu, 4 Dec 1997, Yun-Ching Lee wrote:

> sd0(ahc0:0:0): Deferred Error: MEDIUM ERROR info:0x8b736 asc:10,0 Id CRC
> or ECC error sks:80,22
...
> Does anyone have any idea on what's the problem?

  A medium error means the disk surface has bad sectors.  When you read or
write those areas, the error will come up.  If the sectors are marginal,
you will get the error some of the time.

  You might want to check to see that auto read/write relocation is turned
on for the drive.  If turned on, the drive may be able to relocated the
sectors automatically.  If already turned on, the drive has tried and
failed to relocated the sectors, and you need to reformat your drive with
bad114.

Tom