[1205] in linux-scsi channel archive
Re: medium error, what next?
daemon@ATHENA.MIT.EDU (Michael Weller)
Thu Jan 2 06:02:27 1997
Date: Thu, 2 Jan 1997 11:57:50 +0100 (MEZ)
From: Michael Weller <eowmob@exp-math.uni-essen.de>
To: Gerard Roudier <groudier@club-internet.fr>
Cc: "Stephen R. van den Berg" <srb@cuci.nl>, linux-scsi@vger.rutgers.edu,
ncr53c810@colorado.edu
In-Reply-To: <Pine.LNX.3.91.961221011639.213A-100000@localhost>
On Sat, 21 Dec 1996, Gerard Roudier wrote:
>
>
> On Fri, 20 Dec 1996, Gerard Roudier wrote:
>
> >
> > Use scsi-config as suggested by Leonard to change the Read-Write Recovery
> > Page.
> > Set ARRE to 1 as suggested by Stefan.
> > If EER bit change is supported by your drive set it to 1
>
> I just received my post. Obviously EER must be set to 0 (not to 1).
Etc, etc.
This is an old topic and I think I commented on it already. From my own
experience: Use scsiinfo to check also if there are any alternate sectors
reservered for automatic relocation (look on the formatting mode pages).
Either a given # of sectors per track is reserved or some tracks form a
zone which contains a few alternating (read reserved) sectors.
I already got disks from vendors with automatic sector reallocation
enabled but without any reserved sectors to put the data in (doh!). Of
course, these sectors are taken away from the drives capacity (which is
probably why OEM's reduce the setting to 0 to get one or two more megs
from the disk). If this setting is too low or 0 you can change it with
scsiinfo. However, usually you need to low level format the disk to really
reserve these sectors as backup areas on the disk.
Keep also an eye on the grown defects list. It might be that the disk is
so cheesy that it already ran out of reserved sectors.
Michael.
(eowmob@exp-math.uni-essen.de or eowmob@pollux.exp-math.uni-essen.de
Please do not use my vm or de0hrz1a accounts anymore. In case of real
problems reaching me try mat42b@spi.power.uni-essen.de instead.)
