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Date: Fri, 6 Dec 1996 20:11:05 -0500 (EST)
From: Network Coordinator <nc@ai.net>
To: questions@freebsd.org
Subject: Marking Bad Blocks
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We are seeing errors like this on one of our lab systems:

sd0(ahc0:0:0): MEDIUM ERROR info:396e24 asc:11,0 Unrecovered read error 
field re
placeable unit: ea sks:80,d
, retries:4
sd0(ahc0:0:0): MEDIUM ERROR info:396e24 asc:11,0 Unrecovered read error 
field re
placeable unit: ea sks:80,d
, retries:3
sd0(ahc0:0:0): MEDIUM ERROR info:396e24 asc:11,0 Unrecovered read error 
field re
placeable unit: ea sks:80,d
, retries:2
sd0(ahc0:0:0): MEDIUM ERROR info:396e24 asc:11,0 Unrecovered read error 
field re
placeable unit: ea sks:80,d
, retries:1 

Any friendly utilities to examine the drive(s) and mark the blocks as 
unusable?

Thanks,

John Hubbel
American Information Network