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From: Jean-Marc Zucconi <jmz@cabri.obs-besancon.fr>
To: freebsd-scsi@freebsd.org
Subject: MEDIUM ERROR: is my disk really dead ?
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I have problems with a disk. I got media errors, and a losed a
partition, then a second, then a third... (in about 5 days). 
So i reformatted the disk and I stressed it (I filled it 100 times in
24hours - this is a 1GB disk) and got 'only' 6 errors:
Mar  7 04:12:48 qix /kk: sd2(ncr0:4:0): Deferred Error: MEDIUM ERROR info:9778b  asc:3,0 Peripheral device write fault
Mar  7 04:28:35 qix /kk: sd2(ncr0:4:0): Deferred Error: MEDIUM ERROR info:939d6  asc:3,0 Peripheral device write fault
Mar  7 04:45:19 qix /kk: sd2(ncr0:4:0): Deferred Error: MEDIUM ERROR info:5e230 asc:3,0 Peripheral device write fault
Mar  7 04:45:43 qix /kk: sd2(ncr0:4:0): Deferred Error: MEDIUM ERROR info:6a205 asc:3,0 Peripheral device write fault
Mar  7 04:47:50 qix /kk: sd2(ncr0:4:0): Deferred Error: MEDIUM ERROR info:ad0b8 asc:3,0 Peripheral device write fault
Mar  7 06:05:49 qix /kk: sd2(ncr0:4:0): Deferred Error: MEDIUM ERROR info:199c70 asc:3,0 Peripheral device write fault

Now, trying reads (dd if=/dev/rsd2c ...), it always stops at the same
point: 
sd2(ncr0:4:0): MEDIUM ERROR info:b4c57 asc:11,0 Unrecovered read error, retries:4
sd2(ncr0:4:0): MEDIUM ERROR info:b4c57 asc:11,0 Unrecovered read error, retries:3
sd2(ncr0:4:0): MEDIUM ERROR info:b4c57 asc:11,0 Unrecovered read error, retries:2
sd2(ncr0:4:0): MEDIUM ERROR info:b4c57 asc:11,0 Unrecovered read error, retries:1
sd2(ncr0:4:0): MEDIUM ERROR info:b4c57 asc:11,0 Unrecovered read error, FAILURE

Is there anything I can do?

Jean-Marc
 _____________________________________________________________________________
 Jean-Marc Zucconi       Observatoire de Besancon       F 25010 Besancon cedex
                   PGP Key: finger jmz@cabri.obs-besancon.fr
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